Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
What is meant by dematiaceous fungi?
|
Dark pigmented hyphae
|
|
|
What is meant by hyaline fungi?
|
Colorless hyphae
|
|
|
What regions do most subcutaneous fungal infections occur?
|
In the tropics
|
|
|
What are the four types of subcutaneous mycoses?
|
1) sporotrichosis 2) Chromoblastomycosis 3) Phaeohyphomycosis 4) Mycetoma
|
|
|
Describe the clinical manifestation of sporothrichosis
|
A nodule forms at the site of trauma which will appear suppurate, ulcerate, and spreads along the lymphatics; only yeast forms are observed
|
|
|
What is the fungus that causes sporotrichosis and what are it's distinctive properties?
|
Sporothrix schenckii; it is dimorphic fungus with yeast forms in the tissue and growth as a filamentous fungus with hyaline hyphae at 25C
|
|
|
What is the clinical manifestations of chromoblastomycosis infections?
|
The fungal species are dimorphic based on nutrition and exist as sclerotic boides in the tissue and dematiaceous hyphae in the lab
|
|
|
Describe the manifestations of a phaeohyphomycosis
|
These are fungal infections with dematiaceous hyphae in the tissue and can be dimorphic
|
|
|
Describe the manifestations of a mycetoma infection
|
These infections are caused by both dematiaceous and hyaline forms but all species produce a drianing pus with white or black grains
|
|
|
How can you distinguish a mycetomal infection caused by nocardia from that caused by a subcutaneous fungus?
|
Nocardia are acid fast and the fungi are not; the fungi will show pus with white and black grains
|
|
|
How does sporotrichosis generally occur?
|
Skin trauma to the extremities common in gardners (aka "rose handlers disease")
|
|
|
What is the appearance of a sporotrichosis infection?
|
A reddish, necrotic nodular papule occurs at the innoculation site and spreads along the lymphatics
|
|
|
When is a chromoblastomycosis generally seen after exposure?
|
It is generally seen several years after the injury occurs
|
|
|
What is the appearance of a chromoblastomycosis infection?
|
It appears as a raised, crusted lesion with a dry, warty appearance; it often resembles cauliflower and elephantiasis
|
|
|
What is the appearance of a phaeohyphomycosis?
|
It can range from a localized superficial infection of the skin to a subcutaneous cyst and even invasion of the brain (meningitis); respiratory disease can occur in the nasal cavity, sinuses, and lungs
|
|
|
Describe the appearance of a mycetoma
|
It usually involves the feet with a primary lesion as a small lump under the skin with slow invasive growth that produces ulcerative lesions with a purrative discharge containing dark and white granules
|
