MIRA3006 Lecture Notes - Lecture 4: Greater Omentum, Skeletal Muscle, Calcification
5 Aug 2018
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Measures between 5-10cm in diameter, but they may be as large as 30cm; the mass is typically well circumscribed. Tumours may also arise from the sigmoid mesentery, omentum or peritoneal ligaments. Ct: typically appears as a mass with attenuation similar to that of skeletal muscle. Mesenteric fibromatosis in a 16 year old girl. Rare pathologically benign but locally aggressive primary tumour of the mesentery. Mr: tumour has a low signal on t1 and has high signal on t2. Attenuation at diagnosis is very homogeneous in most cases with minimal to no enhancement. Heterogeneous attenuation is seen only in cases with aggressive histology. During treatment the attenuation becomes heterogeneous as a result of necrosis and fibrosis. In a more advanced stage you can have significant fibrosis resulting in retraction of the small bowel. Within these masses dystrophic calcifications can be seen as well as lucent areas of fat. Suggestive features are a sheet-like peritoneal thickening and absence of lymphadenopathy.
