Features of Turner and Noonan Syndromes may overlap, but there are often features that can help to distinguish the two conditions.

Overlapping features include:

(1) short stature

(2) cardiac abnormalities

(3) webbed neck

(4) renal abnormalities

(5) micrognathia


Features of Turner syndrome:

(1) almost all patients are female

(2) different facial dysmorphism

(3) much lower rate of developmental delay

(4) heart defects are typically left-sided

(5) different pattern of renal involvements


Chromosomal analysis is the definitive test for distinguish the two syndromes.

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