CATSHL syndrome, a new family and phenotypic expansion.

We report the case of a 12‐year‐old girl and her father who both had marked postnatal tall stature, camptodactyly and clinodactyly, scoliosis and juvenile‐onset hearing loss. The CATSHL (CAmptodactyly – Tall stature – Scoliosis – Hearing Loss syndrome) syndrome was suspected, and molecular analysis revealed a hitherto unreported, monoallelic variant c.1861C>T (p.Arg621Cys) in FGFR3. This variant affects the same residue, but is different than, the variant p.Arg621His reported in the two families with dominant CATSHL described so far. Interestingly, peg‐shaped incisors were observed in the proband, a feature never reported in CATSHL but typical of another FGFR3‐related condition, LADD (Lacrimo – Auricolo – Dento – Digital) syndrome. The FGFR3 p.Arg621Cys variant seems to be a newly identified cause of CATSHL syndrome with some phenotypic overlap with the LADD syndrome. [ABSTRACT FROM AUTHOR]