Subcutaneous mycoses
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Transcript of Subcutaneous mycoses
grow on soil or on decaying vegetation
must be introduced into subcutaneous tissue in order to produce disease
GENERALLY : lesions spread slowly from the area of implantation
extension via lymphatics draining the lesion is slow (except in sporotrichosis)
SUBCUTANEOUS MYCOSES
Thursday, January 19, 2012
SPOROTHRIX SCHENCKII
dimorphic
live on plants or wood
causes sporotrichosis
chronic granulomatous infection
Thursday, January 19, 2012
SPOROTHRIX SCHENCKII
DIAGNOSTICS:
pus or biopsy from lesions as specimens
culture on Saboraud’s with clusters of conidia = diagnostic
converts to yeast form at 37C
agglutination of yeast cell from sera = not diagnostic
Thursday, January 19, 2012
SPOROTHRIX SCHENCKII
TREATMENT:
self-limited though chronic
potassium iodide administered orally for weeks
ampothericin B intravenously
oral ketoconazole
Thursday, January 19, 2012
CHROMOBLASTOMYCOSIS (Chomomycosis)
slowly progressive granulomatous infection of skin
caused by black molds
Phialophora verrucosa, Fonsecaea pedrosoi, Rhinocladiella aquaspersa, Cladosporium carrionii
Thursday, January 19, 2012
Phialophora verrucosa
Thursday, January 19, 2012
Fonsecaea pedrosoi
Thursday, January 19, 2012
Rhinocladiella aquaspersa
Thursday, January 19, 2012
Cladosporium carrionii
Thursday, January 19, 2012
DIAGNOSTICS:
specimen: scrapings or biopsy from lesions
microscopy: scrapings in 10% potassium hydroxide (dark, round fungus cells = sclerotic bodies diagnostic)
culture in Saboraud’s and digests gelatin
CHROMOBLASTOMYCOSIS (Chomomycosis)
Thursday, January 19, 2012
TREATMENT:
surgical excision with wide margins for small lesions
chemotherapy with flucytosine or itraconazole for larger lesions
locally applied heat may be beneficial
relapse common
CHROMOBLASTOMYCOSIS (Chomomycosis)
Thursday, January 19, 2012