类癌为具有神经内分泌分化的低度恶性肿瘤,并且在许多部位包括肺、胃肠道、肝、卵巢、膀胱、睾丸和前列腺中已有报道。类癌大多发生于胃肠道(74%)和肺的支气管系统(25%),小于1%的类癌可发生于泌尿生殖系统。肾脏类癌为最少见的肾脏肿瘤之一,起源于肠嗜银细胞和广泛分布于体内的 Carcinoid carcinoids are low-grade tumors with neuroendocrine differentiation and have been reported in many parts of the lung, gastrointestinal tract, liver, ovary, bladder, testis and prostate. Carcinoid tumors mostly occur in the gastrointestinal tract (74%) and the bronchial system of the lung (25%), and less than 1% of carcinoid tumors can occur in the urogenital system. Kidney carcinoid tumor is one of the most common renal tumors, originated in intestinal argyrophilic cells and widely distributed in the body