Osteoclastic giant cell tumor of the pancreas with synchronous jejunal gastrointestinal stromal tumor: A case report.

Osteoclastic giant cell tumor of the pancreas is a rare aggressive tumor, counting for 2-7% of all pancreatic cancers. Surgery is considered the most appropriate treatment. We report a case of a 84-year-old man with incidentally detected 11cm tumor in the pancreatic tail and another 6 cm tumor located in the jejunum on abdominal computed tomography. The patient underwent distal pancreatectomy with splenectomy along with segmental resection of the tumor bearing part of the jejunum. On histological examination, osteoclast-like giant cells with some areas of metaplastic bone were observed which confirmed the diagnosis of osteoclastic tumor of the pancreas. The jejunal tumor was strongly c-kit positive on immunohistochemistry which confirmed the diagnosis of GIST. On the last follow up at 2 years after surgery, there is no evidence of recurrence or distant metastasis. Pancreatic OGCT has a better prognosis after resection than pancreatic adenocarcinoma. Its co-existence jejunal GIST, as seen in the index case, has not been reported in the English literature till date.