Sherif Abdel-Misih and Melissa Hornor
A 55 year old female presented large left upper quadrant mass and episodes of recurrent hypoglycemia. Preoperative laboratory testing revealed normal insulin, IGF-I and IGF-II levels. Big-IGF-II levels were unable to be measured because the laboratory test was unavailable. A CT scan of her abdomen and pelvis revealed a large 19 × 15 × 12 cm left upper quadrant mass appearing to involve the pancreas, spleen, and left kidney. The mass was surgically extirpated and was consistent with a hemangiopericytoma. Subsequently, her hypoglycemic attacks along with abdominal symptoms resolved. We hypothesize that this patient’s hypoglycemic attacks were a consequence of tumor secretion of a pro-hormone form of IGF-II called ‘Big IGF-II’.
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