A case of mucinous cystadenoma of the pancreas resected after nine years of follow-up

Abstract

A 45-year-old woman with no medical history presented for the evaluation of pancreatic cyst enlargement. A 3 cm pancreatic cyst was detected nine years ago at another hospital. As the cyst gradually enlarged, the patient was referred to our hospital. Computed tomography showed a 54-mm cystic lesion with a capsule in the pancreatic tail but no septum. MRI showed the capsule exhibiting a low-signal intensity, while the cyst exhibited a signal with high intensity and low diffusion on T2-weighted images. Endoscopic ultrasound showed a septal wall at the cyst margin and a 5-mm cyst-like lesion inside the cyst. The patient underwent surgery after mucinous cystic neoplasms (MCN) were suspected. Pathology showed no atypia in the epithelium and an ovary-like stroma under the epithelium, and a diagnosis of mucinous cystadenoma was made. MCN usually consists of small and large cysts with their convexity facing the lumen. We report a case of mucinous cystadenoma of the pancreas that was resected after long-term follow-up.