Leeds Fetal Medicine Unit Website

Clinodactyly

Definition	Small or absent middle phalanx (bone) of fifth finger, often medially deviated.
Incidence	1:50 pregnancies
Diagnosis	Ultrasound
Gestation at diagnosis	18 weeks
Known chromosomal or genetic association	Yes, associated with Trisomy 21
Further investigations	Karyotype if other abnormalities or high risk for trisomy 21
Differential Diaganosis	Syndactyly
Prognosis	Excellent
Recurrance risk	Low
Research Studies	None

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