Agenesis

Lack of development of something. For example, agenesis of a toe means that toe failed to form.

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Absence or failure of formation of any part. [G. a- priv. + genesis, production]

- gonadal a. absence of one or both gonads.

- müllerian a. SYN: Mayer-Rokitansky-Küster-Hauser syndrome.

- renal a. absence of one or both kidneys, most commonly unilateral with absence of the ipsilateral paramesonephric duct and its derivatives; renal function is normal as long as the remaining kidney is intact; bilateral or complete renal a. is associated with Potter facies and neonatal death.

- thymic a. absence of the thymus, which may be associated with parathyroid a. in DiGeorge syndrome.

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agen·e·sis (')ā-'jen-ə-səs n, pl -e·ses -.sēz lack or failure of development (as of a body part)

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n.

absence of an organ, usually due to total failure of its development in the embryo.

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agen·e·sis (a-jenґə-sis) [a-¹ + -genesis] absence of an organ, usually referring to such absence resulting from failure of appearance of its primordium in embryonic development. Cf. aplasia.