The first report of an unusual anal atresia with growth of ectodermal organs (wool and skin) in the shape of the intestine inside the body is provided here. During reconstructive surgery, a rectum-like structure was noted, in which wool strands grew densely. A hypothetical mechanism by which this structure formed is presented on the basis of local alterations in fetal tissue proliferation and rate of development.

The first report of an unusual anal atresia with growth of ectodermal organs (wool and skin) in the shape of the intestine inside the body is provided here. During reconstructive surgery, a rectum-like structure was noted, in which wool strands grew densely. A hypothetical mechanism by which this structure formed is presented on the basis of local alterations in fetal tissue proliferation and rate of development.