Giant Trichobezoar on Abdominal CT: A Case of Postprandial Vomiting and 18-kg Weight Loss in an 18-Year-Old Woman
Executive Answer
A giant trichobezoar should be considered when a young patient presents with persistent upper abdominal pain, postprandial vomiting, abdominal distention, marked weight loss, and a palpable upper abdominal mass. On abdominal CT, the key clue is a large intraluminal gastric mass that is distinguishable from the gastric wall and may contain heterogeneous internal attenuation related to hair, air, and retained material. Upper gastrointestinal endoscopy can directly confirm the diagnosis. The critical imaging tasks are to define the extent of the bezoar, assess gastric outlet obstruction, determine whether it extends beyond the pylorus, and look for complications. A large trichobezoar may require mechanical or surgical removal, and evaluation for recurrent hair ingestion is important after treatment.
Why This Case Matters
A gastric mass on CT does not always represent a tumor.
This distinction becomes particularly important when a patient has months of abdominal symptoms accompanied by substantial weight loss. A large intragastric mass can initially raise concern for a gastric neoplasm, but the relationship between the lesion and the gastric wall may provide an important diagnostic clue.
This case involves an 18-year-old woman who had been previously healthy and presented with five months of left upper quadrant pain, abdominal distention, postprandial vomiting, and an 18-kg weight loss. Physical examination identified a firm, tender epigastric mass. Abdominal CT demonstrated a giant intragastric mass extending from the gastric fundus toward the antrum. Upper gastrointestinal endoscopy subsequently demonstrated a large trichobezoar occupying most of the stomach, and a history of hair ingestion was identified.
The bezoar did not completely obstruct the gastric outlet, and there was no evidence that it extended into the duodenum.
The diagnostic lesson is straightforward but important: the size of an intragastric mass does not by itself establish either its nature or the presence of gastric outlet obstruction.
Clinical Scenario
An 18-year-old woman presented with:
Five months of left upper quadrant abdominal pain
Abdominal distention
Recurrent postprandial vomiting
An 18-kg decrease in body weight
A firm, tender epigastric mass on physical examination
Abdominal CT showed a large intragastric mass extending from the gastric fundus to the gastric antrum. The lesion appeared distinguishable from the gastric wall.
Upper gastrointestinal endoscopy demonstrated a mass composed of densely aggregated hair occupying most of the gastric lumen. During clinical history-taking, recurrent hair ingestion was identified.
Importantly, the available clinical information does not document complete gastric outlet obstruction or extension of the bezoar into the duodenum.
This distinction matters because a gastric trichobezoar and Rapunzel syndrome are related but not interchangeable diagnoses.
What Is a Trichobezoar?
A bezoar is an aggregate of material that is not adequately digested or eliminated through the gastrointestinal tract.
Several types exist, including:
Phytobezoars, composed primarily of plant material
Trichobezoars, composed predominantly of hair
Pharmacobezoars, composed of medications or medication-related material
Lactobezoars, consisting of aggregated milk components
A trichobezoar develops when swallowed hair accumulates within the stomach. Hair is resistant to normal gastrointestinal digestion and may become progressively entangled and compacted within the gastric lumen.
Over time, the accumulated material can form a large, firm mass.
Small bezoars may produce few or no symptoms. A giant trichobezoar, however, can occupy a substantial portion of the stomach and interfere with normal gastric filling and emptying. Patients may develop early satiety, abdominal discomfort, postprandial vomiting, poor oral intake, and progressive weight loss.
The clinical presentation therefore depends not only on the presence of the bezoar but also on its size, location, mechanical effects, and associated complications.
Trichobezoar vs. Rapunzel Syndrome
One of the most important terminology issues in this case is the distinction between a gastric trichobezoar and Rapunzel syndrome.
A trichobezoar is a hair-containing bezoar located within the stomach.
Rapunzel syndrome refers to a trichobezoar that extends through the pylorus into the duodenum or more distal small bowel.
Therefore, extension beyond the stomach is a defining consideration.
In this case, the bezoar occupied much of the stomach but was not reported to extend into the duodenum. It should therefore not automatically be labeled as Rapunzel syndrome.
This distinction is clinically relevant because distal extension may increase the risk of intestinal obstruction and may alter the required extent of treatment.
The important imaging question is not simply:
How large is the bezoar?
It is:
Where does the bezoar extend, and what complications has it produced?
The Key CT Finding: A Giant Intraluminal Gastric Mass
Abdominal CT is particularly useful when a large gastric mass is suspected because it can demonstrate the lesion's anatomic location, extent, relationship to the gastric wall, and potential complications.
In this case, the major CT finding was a large mass occupying much of the stomach and extending from the fundus toward the antrum.
The lesion was distinguishable from the gastric wall and demonstrated heterogeneous internal attenuation.
This distinction is the first major radiologic step.
1. Is the lesion arising from the gastric wall?
A gastric carcinoma or gastrointestinal stromal tumor (GIST) may produce a mass associated with the gastric wall.
Radiologic evaluation should therefore examine:
Gastric wall thickening
Asymmetric wall architecture
A definite connection between the mass and the gastric wall
Exophytic or intraluminal growth
Adjacent tissue involvement
Associated lymphadenopathy or other findings when clinically relevant
A bezoar, by contrast, is primarily an intraluminal aggregate of material rather than a mass originating from the gastric wall.
The distinction is not always absolute on a single CT image. Review of the entire CT examination and multiplanar images is important.
2. What is inside the mass?
Bezoars may demonstrate heterogeneous internal attenuation because different materials can become intermixed.
In a trichobezoar, hair may be intermixed with air, food residue, and other gastric contents.
This can produce an irregular or heterogeneous internal appearance.
However, CT appearance alone should not be used to determine the exact composition with certainty. Clinical history and endoscopic findings remain important.
3. How much of the stomach is occupied?
The overall extent of gastric involvement should be documented.
A giant bezoar can extend across multiple gastric regions and occupy a large proportion of the gastric lumen.
In this case, the lesion extended from the fundus to the antrum.
This is clinically meaningful because the degree of gastric occupation can help explain symptoms such as early satiety, abdominal distention, and postprandial vomiting.
4. Is the gastric outlet obstructed?
A very large bezoar does not necessarily produce complete gastric outlet obstruction.
This case provides an important reminder: mass size and mechanical obstruction are not synonymous.
The pylorus should be specifically evaluated, and the radiologist should assess whether gastric contents can pass distally.
Clinical symptoms must also be integrated into the interpretation.
5. Does the lesion extend into the small bowel?
The pylorus, duodenum, and proximal small bowel should be reviewed.
Extension beyond the stomach raises consideration of Rapunzel syndrome or an associated intestinal bezoar.
The presence or absence of distal extension can influence both the diagnostic label and treatment planning.
CT and Endoscopy: Complementary, Not Competing, Tests
CT and upper gastrointestinal endoscopy answer different clinical questions.
| Assessment | Abdominal CT | Upper GI Endoscopy |
|---|---|---|
| Overall anatomic extent | Excellent for defining the full distribution of the mass | Limited to the visualized lumen |
| Relationship to gastric wall | Useful | Direct mucosal assessment |
| Surrounding structures | Useful | Limited |
| Complications | Useful for obstruction, inflammation, perforation, and bowel changes | Direct assessment of mucosal injury |
| Internal composition | May suggest heterogeneous aggregated material | Direct visualization of the bezoar |
| Histologic assessment | Not provided by routine CT | Biopsy can be performed when indicated |
| Potential treatment | Primarily diagnostic and treatment-planning role | Endoscopic fragmentation/removal may be possible in selected cases |
The most useful approach is therefore integrative.
CT can establish the anatomy and extent of the lesion, while endoscopy can directly identify the intraluminal material.
In this case, the two modalities were concordant: CT demonstrated a giant intragastric mass, and endoscopy confirmed that the mass consisted of aggregated hair.
Figure 1. Axial CT: Giant Intragastric Mass
Caption: Axial abdominal CT demonstrates a large heterogeneous intragastric mass that is distinguishable from the gastric wall and occupies a substantial portion of the stomach.
Radiologic interpretation: The lesion is located within the gastric lumen rather than clearly arising from the gastric wall. Its heterogeneous internal appearance is compatible with an aggregated intragastric material such as a bezoar. The complete CT examination should be reviewed to assess its cranial and caudal extent, the pylorus, duodenum, and potential complications.
ALT text: Axial abdominal CT showing a giant heterogeneous trichobezoar occupying the gastric lumen.
Figure 2. Integrated CT, Endoscopy, and Removed Bezoar Findings
Figure 2A. Axial CT
Caption: Axial CT demonstrates a giant intragastric mass extending from the gastric fundus toward the antrum.
The major diagnostic point is the separation between the intraluminal mass and the gastric wall. Gastric outlet obstruction and distal extension should be assessed independently rather than inferred from the size of the mass alone.
Figure 2B. Upper Gastrointestinal Endoscopy
Caption: Upper gastrointestinal endoscopy demonstrates a large aggregated hair mass occupying most of the gastric lumen.
Endoscopy provides direct confirmation of the bezoar and allows assessment of its relationship to the gastric mucosa. It can also help determine whether endoscopic fragmentation or removal is technically feasible.
In this case, there was no reported extension of the bezoar into the duodenum.
Figure 2C. Removed Bezoar
Caption: Gross appearance of the removed giant trichobezoar, demonstrating a large, densely compacted aggregate of hair.
The gross specimen confirms the nature of the intragastric mass identified on CT and endoscopy.
However, the gross appearance alone cannot establish the degree of gastric wall injury, nutritional status, or long-term recurrence risk. Those issues require clinical assessment and follow-up.
Differential Diagnosis of a Large Intragastric Mass
When CT demonstrates a large gastric mass, the first diagnostic question is whether the lesion arises from the gastric wall or represents material within the gastric lumen.
Gastric Carcinoma
Gastric carcinoma may cause focal or diffuse gastric wall thickening, asymmetric wall changes, mass formation, or local tissue invasion.
Although its imaging appearance is different from a typical bezoar, overlap can occur when a large intragastric process is viewed without adequate attention to the gastric wall.
Endoscopy is important when malignancy remains clinically or radiologically plausible.
Gastrointestinal Stromal Tumor
GISTs arise from the gastrointestinal wall and can project into the gastric lumen.
The relationship between the mass and the gastric wall is therefore a major differentiating feature.
Enhancement characteristics, growth pattern, and adjacent structures may also contribute to the differential diagnosis.
Retained Food and Gastric Contents
Food, fluid, and air normally coexist within the stomach.
Inadequate fasting can result in retained material that mimics a mass.
A giant bezoar, however, tends to form a more organized, aggregated mass and may produce persistent symptoms over an extended period.
Endoscopic confirmation can be decisive.
Other Bezoars and Foreign Material
Phytobezoars, pharmacobezoars, and other intragastric foreign material can also appear as masses.
Clinical history may provide important clues, but CT alone may not reliably identify the exact composition.
Endoscopic findings and examination of removed material can therefore be valuable.
Why the 18-kg Weight Loss Matters
An 18-kg weight loss over five months is a major clinical signal.
Weight loss is not specific for trichobezoar, but when it occurs together with persistent vomiting, abdominal distention, and a palpable abdominal mass, a structural gastrointestinal process should be considered.
In this case, the combination of:
persistent symptoms → impaired oral intake → postprandial vomiting → substantial weight loss → palpable mass
creates a clinical pattern that warrants evaluation beyond uncomplicated dyspepsia.
The absence of complete gastric outlet obstruction does not eliminate the clinical significance of the bezoar.
A patient may experience substantial dietary restriction and nutritional deterioration even when the pylorus is not completely occluded.
Treatment: When Is Removal Necessary?
Treatment is individualized according to:
Bezoar type
Size
Consistency
Location
Gastric outlet involvement
Distal extension
Associated complications
Overall clinical condition
Endoscopic Removal
Selected bezoars can be fragmented and removed endoscopically.
This approach can avoid an external surgical incision and allows direct visualization of the lesion.
However, giant trichobezoars may be difficult to fragment because densely packed hair is mechanically resistant.
Repeated procedures may be necessary, and fragmented material can potentially migrate distally.
Therefore, endoscopic accessibility should not be equated with guaranteed endoscopic success.
Surgical Removal
Large, densely compacted trichobezoars may require surgical removal when endoscopic extraction is unlikely to be successful or when complications make operative management appropriate.
The specific surgical approach depends on the size and location of the bezoar, distal extension, complications, and clinical judgment.
For this particular case, the available clinical information confirms removal of the bezoar but does not specify the exact surgical technique or postoperative course. Therefore, a particular operative method or complete postoperative recovery should not be assumed.
This limitation is important when interpreting a case report.
Complications of a Delayed Diagnosis
A persistent bezoar can cause clinically significant complications, although not every patient develops them.
Potential complications include:
Gastric mucosal pressure injury
Ulceration
Gastrointestinal bleeding
Persistent vomiting
Dehydration
Electrolyte abnormalities
Nutritional deficiency
Anemia
Gastric outlet obstruction
Small-bowel obstruction when distal extension occurs
Gastrointestinal perforation in severe cases
The risk should be evaluated clinically rather than inferred from size alone.
A large bezoar without complete obstruction can still cause substantial morbidity through impaired oral intake and chronic symptoms.
Diagnostic Risk: Why This Finding Can Be Missed
A giant intragastric bezoar illustrates several general radiology risks.
Anchoring on a Mass
Once a large mass is identified, there may be a tendency to assume that the lesion represents a neoplasm.
The more useful first question is:
Is this actually a mass arising from tissue, or is it material within a hollow organ?
That distinction can redirect the entire differential diagnosis.
Satisfaction of Search
After identifying a large gastric lesion, the interpretation should not stop.
The radiologist should continue to evaluate:
The gastric wall
The pylorus
The duodenum
The small bowel
Adjacent structures
Evidence of obstruction
Evidence of perforation or inflammation
Failure to Integrate Clinical History
A young patient with chronic postprandial vomiting, substantial weight loss, a palpable epigastric mass, and a history of hair ingestion presents a very different diagnostic context from an older patient with a newly identified gastric wall mass.
Clinical-radiologic correlation is therefore central.
Misinterpreting Size as Obstruction
A giant intragastric mass may appear alarming, but the actual degree of mechanical obstruction must be assessed directly.
In this case, complete gastric outlet obstruction was not identified.
A Practical Diagnostic Algorithm
Clinical suspicion
Persistent upper abdominal symptoms, postprandial vomiting, abdominal distention, weight loss, or a palpable mass
↓
Initial evaluation
Clinical examination and appropriate gastrointestinal imaging
↓
Key imaging finding
Large intragastric mass
↓
Determine origin
Gastric wall lesion vs. intraluminal material
↓
Evaluate CT characteristics
Location, extent, internal attenuation, gastric wall relationship, pylorus, duodenum, and complications
↓
Clinical-radiologic correlation
Consider bezoar when the imaging pattern and clinical context support it
↓
Upper GI endoscopy
Directly confirm the intraluminal lesion and evaluate mucosal involvement
↓
Determine treatment feasibility
Endoscopic fragmentation/removal vs. surgical removal based on size, consistency, location, extension, and complications
↓
After removal
Assess nutritional recovery and the behavioral factors associated with recurrent hair ingestion
AI Perspective: Where Could Medical AI Help?
This case also illustrates a potential role for medical imaging AI, although it does not provide evidence that any particular AI system can reliably diagnose trichobezoars.
A future or appropriately validated imaging-AI workflow could potentially assist with detection of unusual intraluminal abnormalities, flagging unexpected gastric masses, or prompting review of regions that might otherwise receive less attention.
For example, an AI-assisted workflow might identify an unusual intragastric mass on abdominal CT and provide a secondary alert to the radiologist.
However, several limitations are important.
False negatives
An AI system may fail to recognize an uncommon bezoar, particularly if such cases are underrepresented in its training data.
False positives
Retained food, normal gastric contents, foreign material, and true gastric tumors could potentially generate confusing appearances.
Domain shift
Performance may change across scanners, institutions, patient populations, acquisition protocols, and clinical settings.
Anatomical mislocalization
An AI system may identify an abnormal density but fail to correctly distinguish an intraluminal lesion from a gastric wall lesion.
Automation bias
A radiologist should not accept an AI-generated interpretation simply because the system has flagged a finding.
The appropriate role of AI is therefore decision support, not diagnostic substitution.
For a case such as this, the radiologist must still verify the lesion's location, relationship to the gastric wall, extent, complications, and clinical relevance.
Healthcare Workflow Implications
This case also demonstrates why unusual findings matter at the workflow level.
A large intragastric mass can trigger additional imaging, endoscopy, specialist consultation, hospitalization, and potentially procedural or surgical treatment.
Early recognition may help the clinical team move efficiently from:
unexpected gastric mass
to
appropriate differential diagnosis
to
direct endoscopic confirmation
to
definitive removal planning.
The economic impact should not be overstated, because the available case information does not provide specific costs or resource-utilization measurements.
Nevertheless, delayed diagnosis can increase clinical complexity when complications such as obstruction, bleeding, nutritional deterioration, or perforation develop.
The key systems lesson is that diagnostic efficiency is not simply about reading images faster. It is about recognizing the correct clinical problem early enough to guide the appropriate next step.
Clinical Pearls
A giant gastric mass is not necessarily a gastric tumor. First determine whether it arises from the gastric wall or represents intraluminal material.
The CT relationship to the gastric wall is a major diagnostic clue. An intraluminal mass should raise consideration of a bezoar and other retained material.
Heterogeneous internal attenuation can support the diagnosis of a bezoar, but CT appearance alone may not establish its composition.
Do not diagnose Rapunzel syndrome based on size alone. Distal extension beyond the stomach is the critical consideration.
A giant bezoar does not automatically mean complete gastric outlet obstruction. Obstruction must be assessed directly.
Endoscopy and CT provide complementary information. CT defines anatomy and complications; endoscopy provides direct luminal confirmation.
An 18-kg weight loss is an important clinical warning sign when associated with chronic vomiting and a palpable abdominal mass.
Giant trichobezoars may be difficult to remove endoscopically because densely compacted hair can resist fragmentation.
Removal is not necessarily the end of treatment. Recurrent hair ingestion can predispose to recurrence.
AI should be viewed as a potential second-reader or workflow-support tool, not as a replacement for radiologist judgment.
Common Diagnostic Pitfalls
Pitfall 1: Calling every gastric mass a neoplasm
The first diagnostic step should be localization: wall-based versus intraluminal.
Pitfall 2: Reviewing only a single axial image
A single image may not adequately demonstrate the full extent of a large bezoar or its relationship to the pylorus and duodenum.
Pitfall 3: Assuming that a large bezoar must obstruct the gastric outlet
The size of the lesion and the actual degree of obstruction are separate questions.
Pitfall 4: Diagnosing Rapunzel syndrome without demonstrating distal extension
The term should be reserved for a trichobezoar extending beyond the stomach into the intestine.
Pitfall 5: Ignoring the clinical history
Hair ingestion, persistent vomiting, substantial weight loss, and an upper abdominal mass can provide powerful diagnostic context.
Pitfall 6: Assuming CT alone can determine composition
CT may suggest a bezoar, but endoscopic and clinical correlation may be necessary to establish the diagnosis.
Pitfall 7: Assuming endoscopic visualization guarantees endoscopic removal
A giant, densely compacted trichobezoar may remain technically difficult to remove.
Pitfall 8: Treating removal as the complete management strategy
Behavioral assessment and recurrence prevention are important, particularly when recurrent hair ingestion is present.
Frequently Asked Questions
What is the key CT finding of a gastric trichobezoar?
The key finding is a large intraluminal gastric mass that is distinguishable from the gastric wall and may demonstrate heterogeneous internal attenuation related to aggregated hair, air, and retained material. The lesion's location, extent, and relationship to the pylorus and duodenum should also be assessed.
Can a trichobezoar mimic a gastric tumor?
Yes. A giant bezoar can appear as a substantial gastric mass. The relationship between the lesion and the gastric wall is therefore critical. Endoscopy can directly establish whether the apparent mass is intraluminal material.
Does a large trichobezoar always cause gastric outlet obstruction?
No. A bezoar can occupy much of the stomach without completely obstructing the gastric outlet. The presence and severity of obstruction must be assessed separately.
What is the difference between trichobezoar and Rapunzel syndrome?
A trichobezoar is a hair-containing gastric bezoar. Rapunzel syndrome refers to a trichobezoar that extends beyond the stomach through the pylorus into the duodenum or more distal intestine.
Is CT sufficient to diagnose a trichobezoar?
CT can provide a strong imaging clue, but it may not definitively establish the composition of an intragastric mass. Clinical history and upper gastrointestinal endoscopy can provide important confirmation.
Can a giant trichobezoar be removed endoscopically?
Some bezoars can be fragmented and removed endoscopically, but giant trichobezoars may be difficult to manage this way because compacted hair is resistant to fragmentation. Treatment must be individualized.
Why is weight loss important in this presentation?
Marked weight loss combined with chronic vomiting and a palpable abdominal mass suggests that oral intake or gastrointestinal function has been significantly affected and warrants evaluation for a structural gastrointestinal disorder.
Can a trichobezoar recur?
Yes. If recurrent hair ingestion continues, a new bezoar may develop. Removal should therefore be accompanied by assessment of the behavior associated with hair ingestion and consideration of appropriate multidisciplinary support.
Key Takeaways
A giant trichobezoar is an uncommon but important cause of an intragastric mass.
The most useful radiologic approach is to determine whether the lesion arises from the gastric wall or represents material within the gastric lumen. On CT, the radiologist should assess the lesion's location, extent, internal characteristics, relationship to the gastric wall, gastric outlet, duodenum, and small bowel, as well as potential complications.
Upper gastrointestinal endoscopy provides direct confirmation and helps characterize the bezoar and the gastric mucosa.
In this case, an 18-year-old woman presented with five months of abdominal pain, abdominal distention, postprandial vomiting, and an 18-kg weight loss. CT demonstrated a giant intragastric mass extending from the fundus toward the antrum, while endoscopy confirmed a large trichobezoar. There was no reported complete gastric outlet obstruction or extension into the duodenum.
The broader lesson extends beyond bezoars:
When an unusual mass is found inside a hollow organ, always determine whether it is a true tissue-based lesion or aggregated intraluminal material before narrowing the differential diagnosis.
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Medical Disclaimer
This article is provided for medical education and informational purposes only. It is not intended to replace professional medical diagnosis, treatment, or individualized clinical advice. Patients should consult an appropriately qualified healthcare professional regarding symptoms, imaging findings, diagnosis, and treatment decisions.
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