A primary renal neuroendocrine tumor presenting in a fifty-five-year-old woman: a report of a rare entity.

Primary renal neuroendocrine tumors are very rare neoplasms compared to neuroendocrine tumors from other anatomic locations, such as the thoracic and gastrointestinal tract regions. Typically, renal neuroendocrine tumors are well-differentiated, carry a good prognosis, are often larger at presentation than neuroendocrine tumors found at other anatomic locations, and lack the clinical manifestations characteristic of neuroendocrine tumors found at other anatomic sites. Due to the rarity of these tumors, their origins, behavior, and molecular-genetic features are yet poorly defined. Here we describe a case of a well-differentiated primary renal tumor in a 55-year-old woman.