论文部分内容阅读
直肠类癌约占全部类癌的10—17%。类癌根据胚胎起源可分三类:前肠、中肠、后肠。银染色前肠类癌常为嗜银性,中肠为亲银性而后肠者则无银反应。有学者认为多数直肠类癌是后肠发生的。在电子显微镜下类癌细胞的细胞浆中神经分泌颗粒有二型,一型是颗粒形状小而圆,此型见于嗜银性类癌病例。另一型颗粒比前者稍大为同一多形的,可见于亲银性类癌。两型颗粒同存于同一肿瘤,尚未见报道。直肠类癌在组织化学方面常常既非嗜银性亦非亲银性。有的直肠类癌有嗜银染色特性,但有亲银性染
Rectal cancer accounts for about 10-17% of all carcinoids. Carcinoids can be divided into three categories based on embryonic origin: the foregut, midgut, and hindgut. Silver-stained precancers are often osmotic, the midgut is pro-silver, and the hindgut is not silver-reactive. Some scholars believe that most rectal carcinoids occur in the hindgut. Under the electron microscope, the neurosecretory granules in the cytoplasm of cancer-like cancer cells have two types, one type is a small round shape of particles, and this type is found in cases of euthyroid cancer. The other type of particle is slightly more uniform than the former, and is found in the pro-carcinogenic carcinoid. The two types of particles co-exist in the same tumor and have not been reported. Rectal carcinoids are often neither argyrophilic nor pro-silver in histochemistry. Some rectal carcinoids have argyrophilic staining properties, but there are pro-silver stains