Imaging studies. (a) A 60-mm cystic mass was detected in the body and tail of the pancreas without a mural nodule or thickening of the wall by abdominal ultrasound (during the fourth month of gestation). (b) Magnetic resonance imaging (MRI) showed a 76 × 69-mm cystic tumor (arrow), in which the contents were hyperintense in T2-weighted imaging. There were septa in the tumor, and one part of it was thickened and enhanced. (c) Fluorodeoxyglucose positron emission tomography-computed tomography (FDG-PET/CT) showed high uptake (arrow) in part of the cystic tumor (SUVmax 3.03).