Spontaneous Heterotopic Autotransplantation of Splenic Tissue: A Mimic of Pancreatic Malignancy.

Intra-abdominal splenosis is a rare finding which most commonly occurs following traumatic splenectomy. We present a case report of a patient who presented with abdominal pain in which peripancreatic and intrapancreatic lesions were found in the setting of mediastinal lymphadenopathy. Owing to concerns for pancreatic malignancy, we explored these lesions using endoscopic ultrasound with fine-needle biopsy (with rapid on-site evaluation). Ultimately, surgical pathologies revealed the presence of splenic tissues and the diagnosis of pancreatic splenosis.