Patient diagnosed with adenocarcinoma of the colon (colonoscopy showing lesion in the distal transverse colon). Displays sudden onset of abdominal pain and distention.
CT Abdomen and pelvis
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Increased attenuation of mesenteric fat around the bowel, heterogeneous multi-nodular aspect with soft tissue attenuation. There is ascites and slight focal thickening of the transverse colon wall (poorly delimited due to the method used) that may correspond to a vegetative lesion of the colon (adenocarcinoma).
Carcinomatosis implants tend to be flat or ovoid and conform to the adjacent structures; Bowel obstruction and hydronephrosis are frequently seen and also the presence of ascites (different from sarcomatosis) 1.
All peritoneal surface malignancies share similar radiologic features, with seeding of soft-tissue implants along the peritoneum and omentum, rendering differentiation of sarcomatosis from other peritoneal surface malignancies difficult solely by imaging 1.