Mesenteric Panniculitis Appears as Metastatic Disease on F-18-FDG-PET/CT Scan

Mesenteric panniculitis is a rare benign inflammatory process involving mesenteric adipose tissue and the pathogenesis is still unknown. It may present (18)Fluorine-fluorodeoxyglucose (F-18-FDG) uptake and appear like a malign tumor or metastatic disease. We report a case of 47 year-old woman with serous ovarian adenocarcinoma demonstrating intense F-18-FDG uptake and hyperdense nodularity in mesenteric fatty tissue on postchemotherapy position emission tomography/computed tomography imaging. The serum tumor marker (CA-125) level was within the normal range. A correlative magnetic resonance imaging highlighted the diagnosis of mesenteric panniculitis that was also confirmed by clinical follow-up.