[Physiopathology of the venous circulation of the anal canal. Pitfalls in the diagnosis of hemorrhoids].

Many theories attempt to explain the development of hemorrhoids, but none of them is entirely satisfactory. It seems, however, that venoarterial anastomosis plays an important part in the regulation of anal circulation. The diagnosis of hemorrhoids is usually straight-forward in the case of any patient seeking medical help for pain, hemorrhage, or procidentia. The consultant must, however, be careful not to mistake any of the symptoms, and must be able to recognize a developing abscess, a fissure and, in particular, anal cancer. In any case, the diagnosis will not be confirmed until a double routine check has been carried out using a rectoscope, coloscope and baryteal rinse.