Intrapancreatic Accessory Spleen Diagnosed by Size Reduction after Immunosuppressive Therapy: A Case Report.

IPAS can be confused with pancreatic masses. Lack of uptake in scintigraphy may be due to treatment protocols that produce low phagocytic activity. If radiological imaging findings are compatible, a reduction in lesion size after immunosuppressive therapy can be accepted as evidence for the diagnosis of IPAS.