Acquired féline hair shaft abnormality resembling trichorrhexis nodosa in humans

Published on Dec 1, 1996in Veterinary Dermatology1.697
· DOI :10.1111/j.1365-3164.1996.tb00252.x
Zeineb Alhaidari5
Estimated H-index: 5
Thierry Olivry40
Estimated H-index: 40
(North Carolina State University College of Veterinary Medicine),
Jean-Paul Ortonne63
Estimated H-index: 63
A 2-year-old castrated male domestic short-haired cat presented with self-induced alopecia associated with whitish nodes on the remaining hair shafts. Light and scanning microscopy demonstrated swellings of the hair shafts, accompanied by cuticular damage leading to hair fractures with a typical brush-like appearance. A diagnosis of trichorrhexis nodosa associated with flea allergy dermatitis was made. Complete resolution of the condition with flea control suggests an acquired disorder secondary to excessive grooming. Resumen  Un gato domestico de pelo corto, castrado, de dos anos de edad, se presento con alopecia autoinducida asociada a nodulos blancos en los pelos aun presentes. La microscopia optica y de barrido demostraro tumefaccion de los pelos, junto con dano cuticular Uevando a fragmentaciones del pelo con aspecto de cepillo. Se realizo un diagnostico de tricorrexis nodosa asociada a alergia a las pulgas. La resolucion completa de las lesiones tras un control de pulgas sugiere que se trata de una alteracion adquirida secundaria al acicalamiento excesivo. [Alhaidari, Z., Olivry, T., Ortonne, J.-P. Acquired feline hair shaft abnormality resembling trichorrhexis nodosa in humans. (Anomalia del pelo adquirida en la especie felina semejante a la tricorrexis nodosa humana.) Veterinary Dermatology 1996; 7: 235–238.] Resume Un chat male domestique poll court de 2 ans a ete amene en consultation pour une alopecie traumatique avec presence de noeuds blanchâtres sur les tiges pilaires restantes. Microscopie optique et microscopie a balayage ont demontre des dilatations des tiges pilaires, avec des alterations cuticulaires aboutissant a des fractures du poll laissant une extremite avec l'aspect caracteristique de brosse. Un diagnostic de trichorrhexie noueuse associea une DAPP a ete pose. La resolution complete du probleme avec un controle insecticide suggere une pathologie acquise secondaire a un lechage excessif. [Alhaidari, Z., Olivry, T., Ortonne, J.-P. Acquired feline hair shaft abnormality resembling trichorrhexis nodosa in humans. (Anomalie pilaire acquise chez un chat ressemblant a la trichorrhexie noueuse chez l'homme.) Veterinary Dermatology 1996; 7: 235–238.] Zusammenfassung  Ein zweijahriger kastrierter Kurzhaarkater zeigte ein selbst-induzierte Alopezie in Verbindung mit weisljchen Knoten auf den verbliebenen Haarschaften. Licht-und Elektronenmikroskopie zeigte Schwellungen der Haarschafte, begleitet von Schaden der Kutikula, die zu Haarbruch mit typischen burstenahnlichen Erscheinungen fuhrten. Es wurde die Diagnose “Trichorrhexis nodosa in Verbindung mit Flohbisdermatitis” gestellt. Eine vollstandige Abheilung des Zustandes durch Flohbekampfung last an eine erworbene Storung sekundar durch exzessive Fellpflege denken. [Alhaidari, Z., Olivry, T., Ortonne, J.-P. Acquired feline hair shaft abnormality resembling trichorrhexis nodosa in humans (Erworbene Haarschaftanomalie bei der Katze mit Ahnlichkeit zur Trichorrhexis nodosa beim Menschen) Veterinary Dermatology 1996; 7: 235–238.]
#1C. LubetH-Index: 1
#2J. L. BonafeH-Index: 1
Elles sont representees par toutes les anomalies que peuvent presenter les cheveux que ce soit dans leur couleur, leur densite, leur longueur ou leur structure. Elles peuvent etre congenitales ou acquises. L'examen de la chevelure et des tiges pilaires est important dans la mesure ou le cheveu est un marqueur genetique (33). Son examen microscopique peut se reveler tres riche de renseignements et contribuer ainsi au diagnostic de syndromes complexes (9)
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#2M.J. Norris (Cardiff University)H-Index: 1
Last. K.C. James (University of Wales)H-Index: 5
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Trichorrhexis nodosa is a common shaft defect affecting scalp hair. Two-hundred scalp hairs exhibiting trichorrhexis nodosa were obtained from two normal females; samples were prepared from proximal shaft, pre-nodule, nodule and post-nodule sections and analysed for their respective amino-acid compositions. Significant reductions in cystine (P less than 0.001) of the pre-nodule, nodule and post-nodule sections, which decreased by 17.2%, 19.8% and 14.3%, respectively, and an increase in the acidi...
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