[18F]FDG PET/CT in a Rare Case of Pancreatic Ewing Sarcoma.

Extraosseous Ewing sarcoma (EES) is a rare malignant tumor originating from soft tissue, comprising approximately 20% of all Ewing sarcoma cases. EES commonly involves the trunk or extremities, with pancreatic involvement being extremely uncommon. Because of its rarity, EES of the pancreas may be misdiagnosed initially and requires a multimodality approach. We present the case of a 25-y-old woman who was initially treated for acute pancreatitis. However, her symptoms persisted, and a [18F]FDG PET/CT was conducted for evaluation, the results of which suggested malignancy, which was later confirmed on biopsy as EES of the pancreas.