Axel

1.- a MALFORMATION, is a primary structural defect occurring during the development of an organ or tissue.
The risk of recurrence is determined by the aetiology, which may be chromosomal, teratogenic, due to a single gene, or unknown.

2.- a DEFORMATION, is due to abnormal intrauterine moulding and give rise to deformity of structurally normal parts.
The risk of recurrence depends of the underlying disorder.

In both cases you need a genetic counseling.

Maite Solé