Neuroendocrine tumors are either epithelial or neural in origin. Neuroendocrine tumors of the retroperitoneum are mostly metastatic. Primary epithelial neuroendocrine tumors of the retroperitoneum are exceedingly rare. We describe a case of a retroperitoneal tumor that was discovered incidentally during exploratory laparotomy for small-bowel obstruction. Histopathologic and immunochemical analy...

Bronchogenic cysts are uncommon, predominantly benign, congenital malformations arising from the primitive foregut. The occurrence of such cysts in the retroperitoneum is extremely rare. The present study presents the case of a 30-year-old female who presented with a left adrenal mass. Imaging investigations revealed a cystic mass located medially to the left adrenal gland. Retroperitoneal lapa...

Introduction: Retroperitoneal schwannoma is a rare tumor that originates from the Schwann cells of peripheral nerve sheath. It mostly located in brain and spinal cord, but can affect other untypical places such as scrotum penis. Aim: The aim this study was to present two different cases retroperitoneal schwannoma. Case study: authors patients with benign malignant schwannomas (malignant sheath ...

Perivascular epithelioid cell tumors (PEComas) are a rare type of mesenchymal neoplasms characterized by a proliferation of perivascular cells with an epithelioid phenotype and expression of myo-melanocytic markers. The majority of PEComas seem to be benign and usually their prognosis is good. Malignant cases are extremely rare, exhibiting a malignant course with local recurrences and distant m...

Schwannomas may occur anywhere in the soft tissues or viscera, but do not commonly involve the pancreas and retroperitoneum. We present a case of benign pancreatic schwannoma which clinically simulated a malignant neoplastic process.