Mycology

Question 1

Exophiala wereneckii

Answer 1

“Tinea nigra”
Black/brown spots on palms
ID: Young = yeast like, shiny, black, two-celled conidia

Question 2

Piedra hortae

Answer 2

“Black Piedra”
Nodules on hair shaft
slow grower
ID: thick-walled, chlamydoconidia

Question 3

Malassezia furfur

Answer 3

“Pityriasis versicolor”
scaly patches of different colors
ID: Fluoresces POSITIVE under Wood’s Lamp, Spaghetti and Meatballs appearance

Question 4

Trichosporon beigelii

Answer 4

“White Piedra”
Nodules on hair shaft (does not attach and firmly as Black Piedra)
ID: Blasticonidia and Arthroconidia

Question 5

Tinea capitis

Answer 5

Head

Question 6

Tinea barbae

Answer 6

beard

Question 7

Tinea corporis

Answer 7

trunk of body

Question 8

Tinea cruris

Answer 8

inguinal

Question 9

Tinea pedis

Answer 9

feet

Question 10

Tinea mannum

Answer 10

hand

Question 11

Tinea unguium

Answer 11

nails

Question 12

Microsporum canis

Answer 12

From cats/dogs
skin/scalp
ID: Long, spindle shape with >6 compartments

Question 13

Microsprum gypseum

Answer 13

skin/scalp

ID: spindle macroconidia with <6 compartments

Question 14

Epidermophyton floccosum

Answer 14

nails/skin

ID: club-shaped with 2-6 cells

Question 15

Trichophyton mentagrophytes

Answer 15

skin/scalp
Urea +. Hair perforation +
ID: spiral hyphae, round microconidia in bunches, “grape like clusters”

Question 16

Trichophyton rubrum

Answer 16

nails/skin
ID: pyriform, “birds on a wire”
Urea - , Hair perforation -

Question 17

Trichophyton tonsurans

Answer 17

skin/nails
ID: variable shaped conidia
Urea +

Question 18

Trichophyton schoenleinii

Answer 18

scalp infections and hair loss
ID: “favic chandeliers” (deer antlers)
Disease: cup-shaped crusts

Question 19

TX for cutaneous mycoses

Answer 19

Miconazole (topical)
ketoconazole (topical)
Amphotericin B
Fluconazole

Question 20

Histoplasma capsulatum

Answer 20

Disease: pulmonary, leading to systemic ; Bird and Bat feces (chicken coop, bat cave)
Location: MO, MS, Ohio River Valley
Colony: slow grower, white, cottony (yeast like at body temp 35-37)
ID: large, thick walls, spiny balls

Question 21

Blastomyces dermatitidis

Answer 21

Diease: Lesions on body, begins in lungs, going to skin/bones
Colony: white cottony at 25-30 degrees (yeast like at 35-37 body temp)
ID: Broad Based Buds in yeast form ; “lollipop” in fungal form

Question 22

Paracoccidiodes brasilensis

Answer 22

Disease: South America
Colony: slow grower, brown-ish
ID: thick-walled attached by THIN connections “Ships Wheel”

Question 23

Coccidioides immitis

Answer 23

Disease: San Joaquin Valley Fever (AZ, CA… inhale arthroconidida)
Colony: white, cottony, moderate grower
ID: Barrel shaped arthroconidia, thick walled

Question 24

Sporothrix schenckii

Answer 24

Disease: Skin lesion, becoming systemic ; traumatic implantation with contaminated soil ; “Drunken Rose Gardener’s Disease”
Colony: white to black
ID: black, slender, tapered conidiophores with pear-shaped conidia with thread-like denticles, “rosettes”
When it’s yeast-like, it makes “cigar bodies”