Breast cancer is the second leading cause of cancer throughout the world, however neuroendocrine tumors of the breast are rarely encountered. Herein we present a 75-year-old patient who was admitted to our clinic due to a mass in her breast and was operated on with a preliminary diagnosis of invasive breast carcinoma, However she was diagnosed with a neuroendocrine tumor after pathologic evalua...

Bile duct mixed adenoneuroendocrine carcinoma (MANEC) is a rare entity. It is defined as having mixed elements of both neuroendocrine tumors (NET) and an adenocarcinoma element, the lesser component forming at least 30% of the tumor. It is a subtype of neuroendocrine carcinoma (NEC) showing both gland-forming epithelial tumor cells and neuroendocrine cells. It is generally misdiagnosed as chola...

The Calcitonin-negative neuroendocrine tumor of the thyroid (CNNET) or "nonmedullary" in humans is a rare tumor that arises primarily in the thyroid gland and may be mistaken for medullary thyroid carcinoma; it is characterized by the immunohistochemical (IHC) expression of neuroendocrine markers and the absence of expression for calcitonin. An Argentine dogo bitch showed a solid, compact thyro...

Large cell neuroendocrine carcinoma (LCNEC) is a poorly differentiated that typically arises in the lung. Because of its rarity and poor prognosis, standardized treatment has not been established yet. A 53-year-old male was initially diagnosed as maxillary sinus squamous (SCC) arising from inverted papilloma (clinical stage T4bN2bM0, IVb), underwent concurrent chemoradiotherapy. After achieving...