“…35 Eight subgroups have been categorized by Itin et al 35 and include BIDS (brittle hair, intellectual impairment, decreased fertility, and short stature), IBIDS (BIDS 1 ichthyosis), PIBIDS (BIDS 1 photosensitivity), SIBIDS (otosclerosis 1 IBIDS), ONMR (onychotrichodysplasia, chronic neutropenia, and mentral retardation), and Tay, Sabinas, and Pollitt syndromes. 35,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] Trichoschisis is characteristically seen on light microscopy. Under polarized light, the characteristic ''tiger tail'' pattern of alternating bright and dark diagonal bands is seen in most TTD patients and is rarely found in normal individuals.…”