Preferred Label : Thanatophoric dysplasia, type II;
Symbol : TD2;
CISMeF acronym : TD2;
Type : Phenotype, molecular basis known;
Alternative titles and symbols : Thanatophoric dysplasia with kleeblattschaedel; Thanatophoric dysplasia with straight femurs and cloverleaf skull; Cloverleaf skull with thanatophoric dwarfism;
Description : Thanatophoric dysplasia is a severe short-limb dwarfism syndrome that is usually lethal
in the perinatal period. Norman et al. (1992) classified cases of TD into subtypes
based on the presence of curved as opposed to straight femurs; patients with straight,
relatively long femurs always had associated severe cloverleaf skull and were designated
TD type II (TD2), whereas TD cases with curved, short femurs with or without cloverleaf
skull were designated TD type I (TD1; 187600) (Langer et al., 1987).;
Inheritance : Autosomal dominant;
Molecular basis : Caused by mutation in the fibroblast growth factor receptor-3 gene (FGFR3, 134934.0004);