imperforate anus

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 [a´nus] (pl. a´nus)
the opening of the rectum on the body surface.
 The anus. Left, Endoanal magnetic resonance image of the sphincter muscles. High-definition images can be obtained by using an endoanal MRI coil. Right, Explanatory diagram (coronal view in a normal patient). From Aspinall and Taylor Robinson, 2001.
imperforate anus congenital absence of the normal opening of the rectum. Called also anal atresia and atresia ani.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

a·nal a·tre·si·a

, atresia ani
congenital absence of an anal opening due to the persistence of epithelial plug (persistence of the anal membrane) or to complete absence of the anal canal.
Farlex Partner Medical Dictionary © Farlex 2012

imperforate anus

Anal atresia, anorectal atresia GI surgery A congenital obstruction of the anal opening which affects 1:5000 children; in some Pts there may be communication between the GI tract and vagina and bladder Management Surgical anastomosis
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


1. Out of place; said of an organ not in its proper position, or of a pregnancy occurring elsewhere than in the uterine cavity.
Synonym(s): aberrant (3) , heterotopic (1) , imperforate anus (2) .
2. cardiography Denoting a heartbeat that has its origin in some focus other than the sinuatrial node.

a·nal a·tre·si·a

, atresia ani (ā'năl ă-trē'zē-ă, ă-trē'zē-ă' ā'nī)
Congenital absence of an anal opening due to the presence of a membranous septum (persistence of the cloacal membrane) or a complete absence of the anal canal.
Synonym(s): imperforate anus (1) , proctatresia.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Imperforate anus

A congenital malformation (a birth defect) in which the rectum is a blind alley (a cul-de-sac) and there is no anus.
Mentioned in: Ostomy
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.