1. This document discusses atresia ani, or imperforate anus, which is a congenital malformation of the anorectal region. 2. It classifies the different types of atresia ani as high, intermediate, or low based on the location of the rectum. It may occur with or without associated fistulae. 3. Diagnosis involves inspection, inverted X-rays to determine the type, and additional imaging like BNO and IVP before definitive surgery. Surgical treatment depends on the type and may involve emergency or elective procedures like anoplasty or colostomy followed by pull-through surgery.