MediAI

  When an Abnormal Line in the Right Upper Lung Is Not a Tumor Edited by ScholarGen MediAI Executive Clinical Summary A thin, unusual line in the right upper lung field on a chest radiograph can immediately raise concern for a pulmonary lesion, pleural abnormality, or mediastinal pathology. Yet one of the most important possibilities is not disease at all: pulmonary azygos lobe , a rare congenital anatomical variant produced by an unusual course of the azygos vein and associated pleural reflection. The diagnostic challenge becomes considerably more important in an oncology patient. In the present case, a teenage boy receiving chemotherapy for left femoral osteosarcoma underwent routine chest radiography. An abnormal linear structure was identified in the right upper lung field. Subsequent chest CT demonstrated an azygos fissure containing an enhancing azygos vein. However, CT also demonstrated a separate approximately 1-cm pulmonary nodule in the posterior right upper lobe. The nod...

Lung Abscess vs Empyema: CT Findings Every Radiologist Must Know Introduction A 55-year-old man presents with fever, productive cough, chills, and pleuritic chest pain. Chest CT demonstrates two cavitary lesions: one within the right upper lobe containing air and thick, irregular walls, and another in the left lower hemithorax with fluid attenuation and smooth walls compressing adjacent lung tissue. At first glance, both lesions may appear similar. However, one represents a lung abscess , while the other is an empyema . Distinguishing these entities is one of the most important diagnostic challenges in thoracic imaging because management differs dramatically: Lung abscess → prolonged antibiotics and postural drainage. Empyema → urgent tube thoracostomy and drainage. Delayed diagnosis can lead to: Sepsis Respiratory failure Fibrothorax Increased mortality Clinical Background What is a Lung Abscess? A lung abscess is a localized suppurative process with destruction of pulmonary parenchym...

EVALI Lung Injury: Pathophysiology, Imaging Diagnosis, Treatment, and Prognosis of Electronic Cigarette–Associated Lung Disease Introduction Electronic cigarettes and vaping devices have transformed nicotine and cannabis consumption worldwide. However, this transformation has come with a significant public health cost: EVALI (Electronic cigarette or vaping product use–associated lung injury) . Since the 2019 outbreak in the United States, EVALI has become a globally recognized clinical-radiologic entity. It represents a complex inflammatory lung injury syndrome linked primarily to vaping products, especially THC-containing cartridges adulterated with vitamin E acetate. EVALI lung injury is now considered a distinct clinicopathologic syndrome characterized by acute lung injury, systemic inflammation, and characteristic radiologic patterns. Understanding its pathophysiology, epidemiology, clinical presentation, imaging features, differential diagnosis, diagnostic criteria, treatment str...

  Introduction Substernal goiter , also referred to as retrosternal goiter or intrathoracic thyroid goiter , is a clinically significant thyroid disorder characterized by the extension of thyroid tissue from the cervical region into the mediastinum. Although often slow-growing and initially asymptomatic, substernal goiter can lead to life-threatening airway and esophageal compression , making early recognition and accurate imaging diagnosis critical. With increasing longevity of the population and improved cross-sectional imaging, substernal goiter is being diagnosed more frequently, particularly in elderly patients. This article provides a comprehensive, evidence-based review of substernal goiter, integrating pathophysiology, epidemiology, clinical presentation, imaging features, differential diagnosis, diagnosis, treatment, and prognosis , supported by classic and contemporary landmark literature . All imaging findings discussed below directly correspond to the attached clin...

  Top-Tier Keyword Focus: Pulmonary Hamartoma, Popcorn Calcification, Solitary Pulmonary Nodule (SPN), Chondroid Case Presentation: History and Clinical Picture This expert column focuses on a classic radiologic presentation of the most common benign lung tumor: the Pulmonary Hamartoma. The case involves a 22-year-old male who presented for a chest radiograph as part of a pre-military service medical examination. Crucially, the patient was a non-smoker and completely asymptomatic—a textbook example of an Incidental Finding. His general health was otherwise robust, emphasizing that this is a slow-growing, typically silent lesion. The initial chest posteroanterior (P-A) radiograph (Figure 1, Figure 3A) revealed a conspicuous, solitary mass in the upper lung field, prompting further investigation with Computed Tomography (CT).   Radiological Evaluation: The Hallmark Imaging Features 1. Chest X-ray Findings The chest P-A view (Figure 1, Figure 3A), highlighted by the r...