[A case of obstructive pancreatitis induced by extramedullary pancreatic metastasis in a patient with immunoglobulin D multiple myeloma].

A 51-year-old Brazilian female who had IgD-lambda type multiple myeloma presented with epigastralgia and obstructive jaundice during her follow-up. Contrast-enhanced computed tomography (CT) showed an enhanced mass of 25mm in the pancreatic head, and endoscopic retrograde cholangiopancreatography revealed smooth stenoses in the lower bile duct and main pancreatic duct (MPD) of the head. We diagnosed the patient with extramedullary pancreatic metastasis of multiple myelomas. Plastic stents were endoscopically placed into both the common bile duct and MPD. One week later, she suffered a repeat episode of epigastralgia. A subsequent CT scan showed obstructive pancreatitis due to another mass, 30mm in size, emerging rapidly in the pancreatic body. Pancreatitis improved after we replaced the plastic stent with a longer one so that the distal end reached beyond the stenosis at the MPD of the body. Although both the tumors were treated with radiotherapy and showed temporary reduction, the patient died 1 month later due to progression of the disease. While cases involving obstructive pancreatitis induced by extramedullary pancreatic metastasis of multiple myelomas are very rare, it is crucial that such patients are rapidly diagnosed and treated.