痔瘻癌

概要

論文の詳細を見る
Carcinoma rarely occurs in long standing anal fistulas. It is extremely difficult to certify histologically that the carcinoma supervenes on fistula-in-ano. On this account there have been postulated clinical by certain criterion to suggest the carcinoma arising from anal fistula, that is 1) When the anal fistula has been drained for more than ten years, 2) When pain and induration occur at or near the fistula. 3) When mucinous secretion can be seen. 4) When another primary cancer is absent (detectable) in the anorectum 5) When the fistula opening can be seen in the anal canal or at the anal crypt.<BR>Fistula-cancers have some specific features in that they grow in the tissue surrounding the anal canal, mainly as mucinous cancer and have no metastasis in the inferior mesenteric lymphnode, and that they. grow slowly and have low malignancy. Therefore their prognosis seems better than other anal-cancers.