Abstract
We report a case of primary malignant solitary fibrous tumor (SFT) of the pancreas. A 50-year-old man was admitted to our hospital for further examination and treatment after tumor was detected in the pancreas tail on abdominal US as part of his medical check-up. Abdominal CT revealed well-demarcated tumors in the pancreas tail, 9 cm and 3 cm in diameter, and a similar tumor in the posterior pancreas head, 3 cm in diameter. A malignant endocrine tumor in the pancreas tail with lymph node metastasis on the posterior surface of the pancreatic head was suspected based on CT, MRI, and other tests. Distal pancreatectomy was performed. Immunohistochemically, the tumor was diagnosed as a Solitary fibrous tumor (SFT). Histopathologically, the tumor showed coagulative necrosis and multiple mitoses. These pathological findings suggested that the tumor was malignant SFT. Local relapse was recognized 21 months after surgery on abdominal CT. It is currently being followed after chemoradiation owing to refusal of surgery. SFT is an unusual tumor that most often arises in the pleura. Primary SFT of the pancreas is extremely rare. This is the first report that followed a malignant course, including local recurrence, in primary SFT of the pancreas.
