A patient with Tay's syndrome

A 4-year-old girl with Tay's syndrome had the typical features of congenital ichthyosis and the peculiar anomaly of hair growth, trichothiodystrophy. Her hair shafts were brittle and showed alternating light and dark banding when examined microscopically between polarizing filters. Her hair cystine content was 4.6% (control 8.4%).