Lipoma is the most frequent benign mesenchymal tumor that resembles normal white fat. Gastrointestinal tract lipomas are rare. The small bowel is the second predilection site of lipomas following the colon. Mesenteric lipomas mainly occur in adults without gender predilection. They are usually asymptomatic and discovered incidentally. However; these tumors may present with intussusception and intestinal bleeding. CT is the key imaging modality to diagnose mesenteric lipoma. They typically present as well-circumscribed, non-enhancing masses with homogeneous fatty attenuation, which are often contained and separate from free mesenteric fat (Figure 1 and 2: white arrows). On MRI, mesenteric lipomas demonstrate homogeneous signal intensity identical to that of fat. Thin fibrous septa of low signal intensity on T1- and T2-weighted images may be present.
HO is defined by the development of ectopic mature bone within nonosseous tissues. It is a well-described phenomenon that complicates forearm fractures, especially when there is an open fracture, a significant soft tissue injury, and associated neural axis or thermal injury. HO mainly forms near metal hardware and may lead to the formation of radio-ulnar synostosis. CT is superior to plain radiographs, as it identifies the ectopic bone earlier, defines its exact localization, and helps planning the surgical intervention. Radiologic features are variable; in the early stage, CT shows a low-attenuation mass with indistinct surroundings. As the ossification process progresses, zones of mineralization are visible before leading to the formation of mature cortical bone at the periphery (Figure 1 and 2: arrows). Hastings classification describes 5 classes according to how HO affects the forearm range of motion.
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