Without an opening. The term is used to describe a body structure, such as the hymen or anus (see anus, imperforate), in which a normal perforation is lacking.
An adjective meaning lack of an opening. For example, occasionally the ANUS fails to develop properly, resulting in partial or complete obstruction of the opening. Sometimes pubertal girls have an imperforate HYMEN which obstructs the opening to the VAGINA and prevents menstrual ?ow of blood draining to the exterior.
adj. lacking an opening. Occasionally girls at puberty are found to have an imperforate hymen (a fold of membrane close to the vaginal orifice), which impedes the flow of menstrual blood.
(proctatresia) partial or complete obstruction of the anus: a congenital malformation in which the anal canal fails to develop correctly and the rectum ends blindly above the muscles of the perineum. Many types exist, including developmental anal stenosis, persistent anal membrane, and covered anus (due to fused genital folds). Most mild cases of imperforate anus can be treated by a simple operation. If the defect is extensive a temporary opening is made in the colon (see colostomy), with later surgical reconstruction of the rectum and anus.... imperforate anus
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