Multilocular peritoneal inclusion cysts (MPICs) are most commonly found in women of reproductive years and involve the abdomen, pelvis, and retroperitoneum. It is commonly thought that these cysts are due to an inflammatory reaction. Patients usually present with chronic abdominal or pelvic pain and are diagnosed by ultrasound or CT scan. Although there are experimental medical treatment options surgical excision remains the current recommended primary therapy for symptomatic disease. The following case describes a pregnant female with rare MPIC involving the spleen and peritoneum. Biological behavior of MPIC and current therapy options are also discussed.
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