Pseudopili annulati; an unusual variant of normal hair

We report pseudopili annulati for the first time in a dark-haired Chinese girl. The hair was elliptical in shape and twisted along its long axis. The banded or ringed appearance was due to incident light being reflected by the flattened segments. Banding was also noted under polarized light but was not present under transmitted light. Under transmitted light the whole length of the hair appeared dark and the thickness varied at regular intervals, giving rise to fusiform segments due to the twisted nature of the hair shaft. Scanning and transmission electron microscopic examinations revealed no abnormalities in the cuticle and cortex.

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“…Our patient, however, does not have similar skin lesions. Price et al (1) regarded pseudopili annulati as a variant of normal hair.…”

Section: Discussionmentioning

confidence: 99%

“…Pseudopili annulati was first described by Price et al in 1970 (1), as a type of ringed hair characterized by a strikingly banded appearance in reflected light. This banded appearance is due to superficial optical effects stemming from the characteristic elliptical shape and peculiar twisting of the hair.…”

mentioning

confidence: 99%

Pseudopili Annulati in a Dark‐Haired Individual: A Light and Electron Microscopic Study

Lee

Giam

2001

Pediatric Dermatology

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“…PA has to be differentiated from monilethrix (20,21) and pseudopili annulati. The latter shows similar banding ofthe hair shaft due to periodic twisting and an elliptic shape in cross-section of the hair shaft, but can be excluded by light microscopy (22).…”

Section: Discussionmentioning

confidence: 84%

Concomitant Manifestation of Pili Annulati and Alopecia Areata: Coincidental Rather than True Association

Giehl¹,

Schmuth²,

Tosti³

et al. 2011

Acta Derm Venerol

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The autosomal dominantly inherited hair disorder pili annulati is characterized by alternating light and dark bands of the hair shaft. Concomitant manifestation of pili annulati with alopecia areata has been reported previously on several occasions. However, no systematic evaluation of patients manifesting both diseases has been performed. We studied the simultaneous or sequential occurrence of pili annulati and alopecia areata in individuals diagnosed in different European academic dermatology units. We included 162 Caucasian individuals from 14 extended families, comprising 76 affected and 86 unaffected family members. Statistical analysis showed that the frequency of alopecia areata among patients with pili annulati was higher than within the general population. Five of our patients with pili annulati have gone through severe episodes of alopecia areata. We cannot rule out that the currently unknown genetic defect underlying pili annulati might also confer an increased risk for the development of a more pronounced manifestation of alopecia areata. Based on the current data, and considering the low number within individual families of patients affected by both diseases, however, a direct association between pili annulati and alopecia areata seems unlikely.

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“…Trichoscopy reveals light coloured medulla, which constitutes less than 50% of the hair shaft width. Pseudo pili annulati is also a variant of normal characterized by abnormal twisting of hair without any banding under light microscopy [5,13]. Bubble hairs occurs when wet hair is exposed to extreme temperatures causing gas formation within the hair shaft.…”

Section: Introductionmentioning

confidence: 99%

Pili Annulati: A Case Report in Young Siblings

Vijayalakshmi¹

2013

J Clin Exp Dermatol Res

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Pseudopili annulati; an unusual variant of normal hair

Cited by 11 publications

References 5 publications

Pseudopili Annulati in a Dark‐Haired Individual: A Light and Electron Microscopic Study

Pseudopili Annulati in a Dark‐Haired Individual: A Light and Electron Microscopic Study

Concomitant Manifestation of Pili Annulati and Alopecia Areata: Coincidental Rather than True Association

Pili Annulati: A Case Report in Young Siblings

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