agenesis


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Related to agenesis: dysgenesis

agenesis

 [a-jen´ĕ-sis]
absence of an organ due to nonappearance of its primordium in the embryo.

a·gen·e·sis

(ā-jen'ĕ-sis),
Absence or failure to form of any part.
[G. a- priv. + genesis, production]

agenesis

/agen·e·sis/ (a-jen´ĕ-sis) absence of an organ, particularly that due to nonappearance of its primordium in the embryo.
gonadal agenesis  complete failure of gonadal development, as in Turner's syndrome.
nuclear agenesis  Möbius' syndrome.

agenesis

(ā-jĕn′ĭ-sĭs)
n.
Absence or incomplete development of an organ or body part.

agenesis

[ājen′əsis]
Etymology: Gk, a + genein, not to produce
1 a congenital absence of an organ or part, usually caused by a lack of primordial tissue and failure of development in the embryo.
2 impotence or sterility. Also called agenesia. Compare dysgenesis. agenic, adj.
enlarge picture
Agenesis of the corpus callosum

Agenesis

The incomplete or complete nondevelopment of a body part, organ or tissue.

agenesis

Embryology The incomplete or nondevelopment of a body part, organ or tissue. See Anal agenesis, Renal agenesis.

a·gen·e·sis

(ā-jen'ĕ-sis)
Absence or failure of formation of any part.
[G. a- priv. + genesis, production]

agenesis

Absence of an organ or part as a result of failure of development in the early stages. The drug THALIDOMIDE caused agenesis of the limbs.

a·gen·e·sis

(ā-jen'ĕ-sis)
Absence or failure to form of any part.
[G. a- priv. + genesis, production]

agenesis (ājen´əsis),

n the defective development or congenital absence of parts.

agenesis

absence of an organ due to nonappearance of its primordium in the embryo.
References in periodicals archive ?
Genetics and phenomics of hypothyroidism and thyroid dys-and agenesis due to PAX8 and TTF1 mutations.
The life expectancy of a child with renal agenesis is late adolescence because of the reproductive anomalies that alter hormonal changes resulting in severe co-morbid conditions.
Incidence of ICA agenesis (and hypoplasia) is estimated to be 0.
An Unusual Presentation of Pancreatic Dorsal Agenesis.
Furthermore, multiple alterations in the urinary tract may occur such as renal agenesis (more common and predominant on the right side), horseshoe kidney, pelvic kidney, cystic renal dysplasia, duplicated collecting system, and ectopic ureter.
A possible scenario that should not be forgotten is that failure of the neonate to pass meconium through the second opening within 24 hours of birth leads to a colostomy because of the assumption of anorectal agenesis without fistula (1,6).
Mullerian agenesis is the second most common cause of primary amenorrhea in adolescent, after gonadal dysgenesis1, 5 and usually diagnosed at puberty.
After a detailed fetal ultrasound was performed, the patient was found to have right atrial enlargement, cardiomegaly, tricuspid regurgitation, ductus venosus agenesis, hyperdynamic flow in the umbilical vein, and chorioangioma.
The occurrence of the thyroid isthmus agenesis has been recorded to differ from 5% to 10%.
It may be a condition on its own or associated with agenesis of other parts like atresia recti, rectovaginal fistula, rectocystic fistula, vagino-urethral agenesis, cleft scrota etc.