Primary Renal Well-differentiated Neuroendocrine Tumor—Report of a Case With Cytological-Histopathologic Correlation and Review of Literature

Abstract

Abstract Renal well-differentiated neuroendocrine tumor (WDNET; also known as carcinoid), although considered as a distinct entity in the World Health Organization classification, continues to be an enigma to the pathologists and clinicians because of its rarity. In this case report, we describe a case of primary renal WDNET in a 54-year-old man. The tumor was initially diagnosed as a urothelial carcinoma. After a second review and a broad-spectrum immunopanel, a revised diagnosis of WDNET was rendered.