Mesenteric cyst

In volvulus, due to other causes, the location and axis of the mass with whirlpool appearance can vary. In a mesenteric cyst with volvulus of most of the small bowel, the mass is seen below the pancreas, as seen in volvulus of malrotation (Vijayaraghavan et al. 2004). Alternatively, when the volvulus involves only a segment of small bowel, the mass is located close to the umbihcuSjjust above or to the right of it. The best... 

CT and US may demonstrate a low attenuating lesion or an anechoic defect typically located in the tail of the pancreas. This lesion can be unilocular or multilocular with multiple septae. The differential diagnosis includes cyst of renal origin, as well as choledochal, mesenteric, ovarian, and urachal cysts. ERCP and HIDA scans can be used to identify communication with the pancreatic duct or biliary tree. 

There are three types of lymphangiomas the simple capillary, cavernous and cystic types. At least half have ahaemangiomatous component. Most abdominal lymphangiomas are located in the mesentery and omentum, and are called mesenteric and omental cysts, respectively. They are caused by sequestration or obstruction of lymphatic vessels, are mono- or multilocular and can calcify in case of necrosis. The wall of mesenterial and omental cyst is unilayered, which is in contrast to the multilayered aspect of the wall of the duplication cyst. Most cysts are asymptomatic, but because of bleeding or infection they can cause fever and pain and can necrotize after torsion. Adherent cysts to the bowel can cause partial obstruction. Some cause a painless abdominal distension and palpable mass (Carty et al. 2005 Parker 2003 Devos and Meradji 2003). 

Fig.7.8a,b. Pyogenic abscess, a Pyogenic abscess in a 35-year old man status post laparoscopic right hepatectomy due to an hydatid cyst. Portal venous-phase contrast-enhanced CT scan shows a thick-walled cystic lesion with homogeneous low attenuation. b Pyogenic abscess with presence of gas within the lesion in a 52-year-old man with fever, head of pancreas neoplasia (not resectable due to superior mesenteric vein infiltration) and recent portal thrombosis. An axial portal phase CT scan shows an hypoattenuating lesion with non-homogeneous content and gas inside... 

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