MediAI

  Edited by ScholarGen MediAI Team A Multiparametric MRI Case Study of a Complex Renal Mass A renal mass discovered during a routine examination can present a deceptively simple question: Is this lesion benign or malignant? In practice, the answer rarely comes from a single MRI sequence. A modern renal mass evaluation integrates morphology, enhancement, chemical-shift imaging, diffusion characteristics, quantitative ADC measurements, and, in selected research settings, diffusion tensor imaging (DTI) and fractional anisotropy (FA). This case demonstrates how these imaging features can converge into a coherent radiologic phenotype suggestive of renal cell carcinoma (RCC), particularly a clear cell phenotype. The lesion measured approximately 59 × 66 × 57 mm , with a maximum diameter of about 6.6 cm , and was located in the interpolar-to-lower pole region of the left kidney. The most important imaging combination was: Microscopic fat + avid arterial enhancement + early wash-in + delay...

  Executive Answer  A markedly dilated, cystic appendix with mural calcification should not be dismissed as simple appendicitis or nonspecific fluid collection. In this case, a man in his early 60s presented with acute abdominal pain, and ultrasound and contrast-enhanced CT demonstrated a large pear-shaped appendiceal lesion with a thick wall, mixed internal attenuation, and calcification. The final pathology showed mucinous adenocarcinoma arising in association with high-grade appendiceal mucinous neoplasm (HAMN), with invasion into the muscularis propria. The key radiologic lesson is simple: when an enlarged appendix becomes cystic, the radiologist must determine not only whether it is dilated, but why—and whether there is evidence of invasive disease or peritoneal spread. Why This Case Matters Acute abdominal pain naturally directs clinical attention toward common emergency diagnoses, particularly acute appendicitis. That diagnostic reflex is appropriate in many patie...