An abdominoperineal resection, formally known as abdominoperineal resection of the rectum and abdominoperineal excision of the rectum is a surgery for rectal cancer or anal cancer. It is frequently abbreviated as AP resection, APR and APER.
Indication and description
The principal indication for AP resection is a rectal carcinoma situated in the distal (lower) one-third of the rectum. [Source: Wikipedia 
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