(6,7) Wood lamp examination will fluoresce if there are ectothrix
species; however, a negative fluorescence does not differentiate between an endothrix species or lack of infection.
While invading hair, the dermatophytes follow one of several precise patterns of growth: In small spore ectothrix type of hair invasion, for example by M.
In large spore ectothrix type, for example by Trichophyton verrucosum and T.
On the other hand, the observations of fungal filaments with Arthroconidia, Ectothrix
or Endothrix, and the fungal filaments in hair shaft were indicative of the Dermatophytosis and Tinea Faciei.
when the hyphae and spores cover the outside of hair.
Diagnosis of dermatophytes in hair pieces was made by the visualisation of arthroconidia arranged along the length of the hair in chains or masses around the hair (ectothrix
infection) or in the hair substance (endothrix infection).
On high-power magnification, hyphae are seen within the hair shaft in endothrix tinea or in a cuff outside the hair shaft in ectothrix
The samples were kept for 20 minutes and then examined for the presence of ectothrix
or endothrix spores in addition to filamentous, septate, branched hyphae with or without arthrospores and trichospores.
Historically, when the majority of tinea capitis infections in the United States were caused by the Microsporum species, a Wood's lamp examination was helpful in assisting providers in diagnosing tinea capitis; the Microsporum species would fluoresce when examined using a Wood's lamp due to the formation of a sheath by fungal spores on the outside of the hair shaft (ectothrix
The following year Gruby described Trichophyton ectothrix
, another fungi, found at the roots of a man's beard.
Comma hairs, which are slightly curved and fractured hair shafts, are associated with ectothrix
and endothrix type fungal invasion.
canis, an ectothrix
, grow on the outside of the hair shaft and produce a substance that fluoresces green under a Wood's Lamp.