消化道常见的平滑肌肿瘤一般分为良性(平滑肌瘤)和恶性(平滑肌肉瘤)。1960年Martin氏等首次报告6例其组织学特征与上述二型不同,发生于胃的平滑肌肿瘤,称为“肌样瘤”(Myoid tumor)。肿瘤主要由圆形或多边形细胞组成,核圆形,卵圆形或长形,核周有部分或完全的透明晕围绕;胞浆较丰富,呈微酸性,少数胞浆有嗜酸性 Digestive tract common smooth muscle tumors are generally divided into benign (leiomyoma) and malignant (leiomyosarcoma). In 1960, Martin et al. first reported 6 cases of histological characteristics different from the above two types, occurring in the stomach of smooth muscle tumors, called “Myoid tumor” (Myoid tumor). Tumors are mainly composed of round or polygonal cells, with round, oval or elongated nucleus, surrounded by a partially or completely transparent halo around the nucleus; the cytoplasm is rich, slightly acidic, and a few cytoplasms are eosinophilic.