Trichothiodystrophy - hair that never grows
Trichothiodystrophy (TTD) is an inherited disorder characterized by brittle hair. The hair breaks easily, what makes the impression the it "never grows"
TTD is associated with a range of symptoms connected with organs of the ectoderm (skin etc) and neuroectoderm (nervous system etc). TTD may be subclassified into four syndromes: BIDS and PBIDS, and IBIDS and PIBIDS.
The acronyms are based on the presence or absence of the following features: photosensitivity (P), ichthyosis (I), brittle hair (B), intellectual impairment (I), decreased fertility (D), and short stature (S).
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