Skin VII Flashcards
list the 3 members of dermatophytes
- Epidermophyton spp.
- Microsporum spp.
- Trichopyhton spp.
dermatophytes are spread via ____
why is this significant?
dermatophytes are spread via peron-to-person contact
fungi are usually inhaled but this is an exception
diagnosis of dermatophytes is skin/hair/nail scraping cultured on ____
diagnosis of dermatophytes is skin/hair/nail scraping cultured on Mycosel agar
70% of Trichophyton cases are ____
70% of Trichophyton cases are athlete’s foot (Trichophyton rubrum)
why is Microsporum, macroconidia significant?
they are positive for the 3 tests:
hair perforation test +
fluorescence +
urea +
what fungus is implicated in a vignette that has “sleeping with a dog,” or “got a dog recently”?
Microsporum canis
“spindle/lancet-shaped”
describe the image
“Beaver tail”
describe the image
parallel-shaped macroconidia
describe the image
“birds on a line”
the most common cause of Tinea versicolor is ____
the most common cause of Tinea versicolor is Malassezia furfur
M. furfur produces hypopigmented plaques by inhibiting ___
M. furfur produces hypopigmented plaques by inhibiting tyrosinase
what causes the condition seen in the image?
M. furfur
diagnosis of the condition seen in the image is via ___
diagnosis is via KOH preparation, which shows short hyphae and spores with a spaghetti-and-meatballs appearance
treatment of Tinea versicolor is with ____
treatment of Tinea versicolor is with Selenium sulfide shampoo
the cause of Tinea nigra is ____
the cause of Tinea nigra is Hotaea werneckii
Tinea nigra appears as a brownish spot caused by ____
Tinea nigra appears as a brownish spot caused by melanin-like pigment in the hyphae
Tinea nigra appears as a ____ spot caused by the melanin-like pigment in the hyphae
Tinea nigra appears as a brownish spot caused by the melanin-like pigment in the hyphae
black and white piedra is caused by fungal infection of ____
black and white piedra is caused by fungal infection of the hair shaft
the nodules in black and white piedra are ___ and ___ of the fungus (____)
the nodules in black and white piedra are hyphae and fruiting bodies of the fungus (ascostroma)
black piedra is caused by ____ and ____
black piedra is caused by Piedraia hortae and Trichosporon ovoides
white piedra is caused by fungi in the ____ genus
white piedra is caused by fungi in the Trichophyton genus
in black and white piedra, ___ and ___ are potentially life-threatening in immunocompromised patients
in black and white piedra, Trichosporon asahii and T. inkin are potentially life-threatening in immunocompromised patients
chromoblastomycosis is caused by ____
chromoblastomycosis is caused by Dematiaceous fungi
describe the presentation in chromoblastomycosis
a verrucous, slow-growing nodule present as large brown spherical bodies (chromo bodies) in the dermis
in labs, chromoblastomycosis is seen as dark brown, round fungal balls in ___ or ____
in labs, chromoblastomycosis is seen as dark brown, round fungal balls in leukocytes or giant cells
the transmission of chromoblastomycosis is via ____
the transmission of chromoblastomycosis is via traumatic implantation
the condition seen in the image extends along ____
chromoblastomycosis extends along the lymphatics
the condition seen in the image is a slowly progressive, ____ infection that is caused by fungi when introduced into the skin through trauma
chromoblastomycosis is a slowly progressive, granulomatous infection that is caused by fungi when introduced into the skin through trauma
sporotrichosis is caused by ____
sporotrichosis is caused by Sporothrix schenckii
sporotrichosis is also called ____
sporotrichosis is also called “rose gardener’s disease”
sporotrichosis spreads/follows the ___
sporotrichosis spreads/follows the lymph
describe the 2 presentations in the lab of sporotrichosis
transmission of sporotrichosis is commonly associated with….
transmission of sporotrichosis is commonly associated with:
splinters
thorns
moss
mulch
hay
Candidiasis causes ____
Candidiasis causes oral thrush, cutaneous candidiasis, vaginitis
describe the lab test performed on Candida
- tissue specimen: 10% KOH
- culturing on selective and differential yeast media (i.e. tryptan blue media)
- Candida appears light blue
diagnosis of Candidiasis is by observing ____ and ____ in specimen
diagnosis of Candidiasis is by observing budding yeast cells and pseudohyphae in specimen
dimorphic fungi are :
yeast at ____ degrees C
mold at ____ degrees C
yeast at 37 degrees C
mold at 25 degrees C
