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PH 152 > Superficial Mycoses > Flashcards

Superficial Mycoses Flashcards

1
Q

causative agent of white piedra

A

Trichosporon beigelli / Trichosporon cutaneum

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2
Q

causative agent of black piedra

A

Piedraia hortae

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3
Q

causative agent of an-an

A

Malassezia furfur

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4
Q

causative agent of tinea nigra

A

Exophiala werneckii

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5
Q

lesion of pityriasis versicolor is what color under Wood’s lamp

A

fluorescent green

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6
Q

false about Malassezia fur fur
A.lipophilic yeast
B.not part of skin normal flora
C.culture not necessary

A

B

part soya

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7
Q

morphology of M.furfur under KOH/PAS

A

spaghetti with meatballs

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8
Q

treatment of an-an aside from fungicides and miconazole

A

selenium sulfide (1%) shampoo for 15 mins

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9
Q

false about Exophiala werneckii
A.it looks more like a yeast as it grows older
B.with dematiaceous hyphae
C.occurs in aggregated masses

A

A

more like mold dapat

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10
Q

keratinolytic agent for treatment of E.werneckii or tinea nigra

A

Whitfield’s ointment

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11
Q

in piedra: what are fungal elements cemented together along hair shaft

A

nodules

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12
Q

Which is more concentrated, firmer and harder?
A.white piedra
B.black piedra
C.equal

A

B

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13
Q

Piedraia hortae - describe morphology

A

round to oval ascus (packman) curved to form ascospores (firework like); can have 8 ascospores in 1 ascus

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14
Q

Which has nodules with irreg transparent sheath?
A.white piedra
B.black piedra
C.equal

A

A

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15
Q

morphology of white piedra EA @ KOH

A

Hyaline septate hyphae & oval/rectangular arthroconidia

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16
Q

false about biochemical tests of T.cutaneum/beigelii
A.assimilates dextrose, lactose, D-xylose, inositol
B.does not ferment carbohydrates
C.splits arbutin
D.urease positive

A

D

17
Q

true or false. pityriasis versicolor is always hypopigmentation

A

False

it is always reverse of your skin color

18
Q

Which is seen more in pubic area?
A.white piedra
B.black piedra
C.equal

A

a

19
Q

Which is seen more in scalp area?
A.white piedra
B.black piedra
C.equal

A

B

PH 152 (47 decks)

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