True mixed giant cell tumors of the pancreas 1 that are composed of osteoclastic 2 and pleomorphic 3 giant cells are quite rare. Three such cases have been reported previously in the English literature, but ours is the first case from Saudi Arabia. The biologic behavior of osteoclastic giant cell tumors (OGCT) 4 is that of a locally aggressive lowgrade malignancy, in contrast to pleomorphic giant cell tumors (PGCT), which behave in a highly malignant fashion. The behavior of true mixed giant cell tumors (OGCT+PGCT) is not known, because of the limited number of cases. Our case, which was a true mixed tumor of giant cells, behaved in a highly aggressive manner. In this report we document that if pleomorphism is seen among giant cell tumors of the pancreas, then such tumors should be regarded as highly malignant and be treated accordingly.
Case ReportA previously healthy 65-year-old Saudi male presented with a four-month history of left upper quadrant pain radiating to the back, and associated with considerable anorexia and recent onset of weight loss. There was no prior history of gastrointestinal disease or pancreatitis. Examination revealed an ill-defined non-tender mass near the left hypochondrium without any evidence of peritoneal irritation. There was no palpable lymphadenopathy or hepatosplenomegaly.Laboratory evaluation revealed normochromic, normocytic anemia. Liver function tests were normal. Serum chemistry levels such as urea, creatinine, glucose and electrolytes were also within normal limits. Stool examination revealed no parasitic ova or occult blood. The urine examination was normal. An ultrasound examination of the abdomen revealed an ill-defined mass on the posterior abdominal wall related to the body and tail of the pancreas. CT scan demonstrated a tumor arising from thejunction of the body and tail of the pancreas, measuring about 20 cm. A roentgenogram of the chest showed mild cardiomegaly with subsegmental left basilar atelectasis. Endoscopy of the upper gastrointestinal tract was normal, however, it was not possible to negotiate beyond the descending colon on flexible colonoscopy. Barium enema showed a cutoff near the splenic flexure. At this point, it was decided to perform an explorative laparotomy through a midline incision, which revealed a tumor arising from the junction of the body and tail of the pancreas. The tumor was firm, dark, hemorrhagic and irregular-shaped, with some cystic areas. There was no evidence of any local invasion or liver metastases. Subtotal distal pancreaticosplenectomy was performed, which resulted in temporary improvement of the patient's condition. The patient was discharged home two weeks after the operation. He was readmitted four months later because of anorexia and continued weight loss. A thorough workup did not reveal any recurrence or metastases from the tumor. Supportive treatment was instituted, but the patient died about five months after the operation.Histopathological examination (Figure 1) revealed a tumor containing abundant multinucleated osteo...