Peritoneal pseudocyst--ventriculo-peritoneal shunt complications.

Pseudocyst formation is a rare complication of ventriculo-peritoneal shunt, occurring in only 22 cases of 1300 shunts from 1968 to 1992. The most common presentation is that of abdominal signs rather than neurological or infectious signs. The diagnosis is easy with ultrasonography. The difficulty is to evocate the cyst and to correlate symptoms and cyst. Treatment of the cyst was by aspiration (21 cases) and excision in 7 cases. The therapeutic choice is made according to the ultrasound findings. When the cyst was infected, an external ventricular shunt was used temporary, but this type of shunt must be avoided where possible. Three patients died.