TY - JOUR A2 - Swaminathan, R. A2 - Capella, C. AU - Malabu, Usman Hammawa AU - Karamatic, Rozemary AU - Mahy, Gillian AU - Sangla, Kunwarjit Singh PY - 2011 DA - 2011/07/10 TI - Malignant Range Elevation of Serum Chromogranin A due to Inadvertent Use of Proton Pump Inhibitor in a Subject with Pancreatic Incidentaloma SP - 342480 VL - 2011 AB - We present a case of highly elevated tenfold rise of serum chromogranin A in a young, morbidly obese, hypertensive female being investigated for pancreatic mass, weight loss, and elevated ESR. Following extensive noninvasive investigations, an ultrasound-guided pancreatic biopsy confirmed benign haemorrhagic cyst. A clue to the etiology of the hyperchromogranin A was the elevated serum gastrin level leading to suspicion of proton pump inhibitor administration confirmed by admittance to its use. Withdrawal of the medication led to dramatic resolution of the neuroendocrine tumor marker. SN - 2090-6501 UR - https://doi.org/10.1155/2011/342480 DO - 10.1155/2011/342480 JF - Case Reports in Endocrinology PB - Hindawi Publishing Corporation KW - ER -