Peritoneal CSF pseudocyst
History of VP shunting done for hydrocephalus in past. Complains of abdominal pain and fullness.
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A large, well-defined cystic lesion is seen centered on the tip of VP shunt within the peritoneum. It measures 6.8 x 5.2 x 5.7 cm with average HU of 8-10 HU.
CSF collection around the tip of VP shunt in the peritoneum is called a peritoneal CSF pseudocyst (CSFoma). On CT, fluid with CSF density (9-10 HU) is seen around the tip of the shunt.