Cutaneous Mycoses/Dermatomycoses Flashcards
Is common fungal skin infection otherwise known as Tinea.
Ringworm
Types of ringworm:
Body
Tinea corporis
Types of ringworm:
Scalp
Tinea capitis
Types of ringworm:
Feet
Tinea pedis or athlete’s foot
Types of ringworm:
Groin
Tinea corporis or jock itch
3 main genera of ringworm:
Microsporum
Trichophyton
Epidermophyton
3 main genera of ringworm:
=affects the hair and skin
Microsporum
3 main genera of ringworm:
=affects the hair, skin and nails
Trichophyton
3 main genera of ringworm:
=affects the skin and nails
Epidermophyton
In ringworm, for nails and skin observes _____
hyaline, septate hyphae
In ringworm, hair, skin and nail culture uses __________ and incubate at RT 4-6 weeks before
reporting
mycosel or mycobiotic medium
Latin noun:
ringworm infection of the head and scalp
Tinea capitis
Latin noun:
=ringworm infection of the inguinal area( e.g. jock itch, gym’s itch, ringworm of the groin)
Tinea cruris
Latin noun:
=ringworm infection of the body
Tinea corporis
Latin noun:
ringworm infection of the beard or mustache (barber’s itch)
Tinea barbae
Onchomycosis is most often due to
Trichophyton rubrum and T. interdigitale
Onchomycosis can be present as several different patterns:
A white or yellow opaque streak appears at one side of the nail.
Lateral onychomycosis
Onchomycosis can be present as several different patterns:
Scaling occurs under the nail
Subungual hyperkeratosis
Onchomycosis can be present as several different patterns:
The end of the nail lifts up. The free edge often crumbles.
Distal onycholysis
Onchomycosis can be present as several different patterns:
Flaky white patches and pits appear on the top of the nail plate
Superficial white onychomycosis
Onchomycosis can be present as several different patterns:
Yellow spots appear on the half-moon (lunula)
Proximal onychomycosis
Macroconidia: Rare, if present “spindle-shaped”
Microconidia: Rare, “leaf-like” or absent
Colony: Downy white to salmon pink
Microsporum audonii
Common caused of ringworm in dogs and cats
Characteristic colony: white and fluffy; reverse canary yellow pigment, large thick walled, spindle shaped “boat-shaped”
Microsporum canis
Characteristic colony: Mold and cottony light brown “cinnamon powdery color
Microsporum gypseum
Characteristic; thick septa, “bamboo” hyphae
Microsporum ferrugineum
Worldwide cause of athletes foot
Characteristic Microscopic
appearance
Macroconidia: “cigar-shaped” 2-cells
Microconidia: “grape-like clusters” or “engrappe” lateraly along the hyphae
Tricophyton mentagrophyte
Macroconidia: usually absent; if present “pencil-shaped” 3-8 septa
Microconidia: “tear-drop” most commonly borne along the ides of hyphae
Tricopohyton rubrum
Characteristic of skin lesion is CONCENTRIC/RING-SHAPED in appearance
Balloon shaped chlamydoconidia
Tricophyton concentricum
Macroconidia: “balloon” forms are seen
Microconidia: “tear-drop/ club-shaped” with flat bottons
Tricophyton tonsurans
Macroconidia: rare; but form “rat-tail” type, 3-5 cell, thin walled
Microconidia: rare; large and “tear-drop” when seen
Tricophyton verrucosum
Branched tortuous hyphae
Chlamydospore are usually aligned in chains
Colony; Portwine to deep violet colony
Tricophyton violaceum
Hyphae seen as “favic-chandeliers”
Colony: Irregular heaped, smooth white to cream colony with radiating grooves
Tricophyton shoenleinii
Microscopic characteristics: “club-shaped macroconidia” usually formed singly or in clusters
No microconidia
Colony: Center of the colony tends to be folded and is khaki green, periphery is yellow
Epidermophyton floccosum
