报告了1例类癌性肿瘤,并作了免疫组化及超微结构研究。患者女,87岁,胸部局限性肿瘤60年,近3年生长迅速。此瘤位于胸骨的上方,呈圆顶状,直径达9.5cm,高3.0cm,限局、质硬、其表面皮肤有小的溃疡,与深部胸骨不粘连,乳房和淋巴结未累及。HE染色,肿瘤由叶状和索状的上皮瘤细胞和粘液基质组成,部分肿瘤细胞孤立于粘液丰富的基质内,周围有一薄的纤维血管性间隔,肿瘤细胞胞浆特别是胞浆周围可见嗜酸性纤细颗粒,胞核圆形至椭圆形,瘤巢周围有轻度的炎症细胞浸润。瘤细胞和基质 A case of a carcinoid tumor was reported and immunohistochemical and ultrastructural studies were performed. The patient female, 87 years old, had a localized thoracic tumor for 60 years and had a rapid growth in the last 3 years. This tumor is located on the upper part of the sternum. It is dome-shaped, measuring 9.5 cm in diameter and 3.0 cm in height. It has limited organs, hard skin, and small ulcers on its surface. It does not adhere to the deep sternum, and the breast and lymph nodes are not involved. HE staining, the tumor consists of phyllodes and cords of epithelial cells and mucus matrix, part of the tumor cells isolated in a mucus-rich matrix, surrounded by a thin fibrous vascular space, tumor cells cytoplasm, especially around the cytoplasm Acidic fine particles, round to oval nucleus, mild inflammatory cell infiltration around the tumor nest. Tumor cells and stroma