title: EUS-FNA for the Diagnosis of Retroperitoneal Primitive Neuroectodermal Tumor.
abstract: Primitive neuroectodermal tumor (PNET) is a rare "small round blue cell tumor" that is diagnosed by open biopsy or percutaneous biopsy of the lesion under radiologic guidance. In this case report, we present a novel approach to the diagnosis of a retroperitoneal PNET by endoscopic ultrasound- (EUS-) guided fine needle aspiration (FNA). A 35-year-old man presented with the history of left-sided flank pain and swelling of 3-weeks duration. Computerized tomography (CT) scan of his abdomen revealed a 12.8 × 13 × 12.5 cm cystic and solid mass arising from the retroperitoneum and displacing the third and fourth portions of the duodenum. He underwent EUS which revealed a well-circumscribed heterogeneous mass abutting the inferior portion of the stomach. EUS-FNA of the mass revealed malignant cells consistent with primitive neuroectodermal tumor (PNET)/Ewing's sarcoma. EUS-guided FNA is an appropriate technique for diagnosing retroperitoneal PNET/Ewing's sarcoma.
authors: Division of Gastroenterology, Department of Internal Medicine, University of Toledo Medical Center, 3000 Arlington Avenue, Toledo, OH 43614, USA.
authors: Aijaz A
authors: AA
authors: Sofi
authors: Ashish D
authors: AD
authors: Thekdi
authors: Ali
authors: A
authors: Nawras
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