What's your diagnosis? The m. sphincter ani is located at 1. I'll post the correct answer in a couple of days!
colon dilated with air secondary to rectal obstruction. cause may be hirschsprung disease.Imperforate Anus ...
Correct answer: Anorectal malformation (abbreviated ARM), in this case classified as a low anomaly. In this low lesion, the colon remains close to the skin but ends in a blind pouch (3). Here the anus is also missing, even though the m. sphincter ani are there. It occurs in about 1 in 5.000 births. The prognosis depends on possible associated anomalies (e.g. in the urogenital tract).