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Hair Disorders
Cartilage Hair Hypoplasis
Cartilage Hair Hypoplasis is a hair disorder that results in abnormally fine, sparse, and lightly colored hair that is usually short.
Hair Peripilar Cast
Hair peripilar cast is a freely movable, firm, yellowish-white material ensheathing scalp hairs resulting from scalp disorders, such as psoriasis or seborrhoeic dermatitis.
Monilethrix
Monilethrix is a rare hair disorder that results in periodic nodes or beading along the length of the hair with intervening, tapering constrictions that are not medullated. Monilethrix is caused by a defect in the hair shaft resulting in hair appearing dry, dull, and brittle, and it breaks spontaneously or with mild trauma. The age of onset, severity, and course may vary from person to person.
Pili Annulati
Pili annulati is a hair disorder that results in ringed or banded hair, alternating bright and dark bands in the hair shaft. The dark bands are a manifestation of the abnormal air spaces in the cortex.
Pili Bifurcati
Pili bifurcati is a genetic hair disorder characterized by two hairs joined at the shaft along their entire length.
Pili Torti
Pili torti is a genetic hair disorder characterized by the hair shaft being flattened and twisted 180 degrees numerous times along its axis. It is usually found at irregular intervals along the shaft. Coarse, dry, lusterless hair which breaks off easily.
Trichonodosis
Trichonodosis is a condition characterized by apparent or actual knotting of the hair.
Trichoptilosis
Trichoptilosis is a disease condition characterized by longitudinal splitting or fraying of the hair shaft.
Trichorrhexis Invaginati
Trichorrhexis invaginati is a genetic disease characterized by a segment of bulbous, dilated hair enfolded into a concave hair terminal, recalling the appearance of a bamboo node. If the hair breaks at the bulbous end, the hair has a "golf tee cup" end.
Trichorrhexis Nodosa
Trichorrhexis nodosa is a condition characterized by the formation of nodes, and in extreme cases, the hair is weaker at the node and is subject to breakage.
Trichoschisis
Trichoschisis is a condition characterized by brittle hair with a transverse crack or a clean break.
References:
1) President's DNA Initiative - Advancing Justice Through DNA Technology - www.dna.gov
2) National Institutes of Health (NIH) - rarediseases.info.nih.gov
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