(Figures 4.23D and 4.24A) - Common dermatophyte infection in scalp of children
- Two types: endothrix and ectothrix
- T. tonsurans (endothrix) most common cause; second most common is M. canis (highly inflammatory) and M. auodouinii
- Ectothrix: fungal spores coat outside of hair and cuticle destroyed; may or may not fluoresce with Wood’s light (365 nm, mercury lamp with nickel chromium oxide filter)
| | | | | | | | Fluorescent ectothrix | | Nonfluorescent ectothrix | | | M. canis | | T. mentagrophytes | | | M. audouinii | | T. verrucosum | | | M. distortum | | T. rubrum | | | M. ferrugineum | | T. megnini | | | M. gypseum (sometimes) | | M. nanum | | | T. schoenleinii | | | | | | | | | | | | | | | | | Fluorescent: Cats And Dogs Fight and Growl Sometimes (due to pteridine ) | | | | | | | | |
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- Endothrix: spores within hair shaft, cuticle intact, hairs can break at surface (“black dot” tinea)
- T. rubrum (causes both endo/ecto), T. gourvilli, T. yaounde, T. tonsurans, T. soudanense, T. violaceum
| | | | | | Endothrix: Ringo Gave Yoko Two Squeaky Violins | | | | | |
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| | Figure 4.23
A: Tinea barbae
(Courtesy of Dr. Marcus
Henrique de Sousa
Brito Xavier, Brazil)
B: Tinea faciei
(Courtesy of Dr. Paul Getz)
C: Tinea faciei D: Tinea capitis
(Courtesy of Dr. Paul Getz) |
| | Figure 4.24
A: Tinea capitis
(Courtesy of Dr. Paul Getz)
B: Tinea pedis, interdigital
C: Onychomycosis |
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