Deck 59: Dematiaceious Molds

Question 1

Macroscopic examination of granules from lesions of mycetoma reveals them to be white to yellow and 0.2 to 2 mm in diameter.Microscopically,the granules consist of loosely arranged,intertwined septate hyaline hyphae cemented together.Which organism can cause a mycetoma infection?

A)Fonsecaea spp.
B)E.dermatitidis
C)Cladosporium spp.
D)P.boydii

Answer 1

D
Macroscopic examination of granules from lesions of mycetoma caused by P.boydii reveal them to be white to yellow and 0.2 to 2 mm in diameter.Microscopically,the granules of P.boydii consist of loosely arranged,intertwined septate hyaline hyphae cemented together.

Question 2

Mycetoma is a subcutaneous infection that involves the lower extremities but may also occur in any part of the body.Swelling,purplish discoloration,and tumorlike deformities of the subcutaneous tissue are all symptoms associated with mycetoma.Which organism can cause this disease?

A)Bipolaris spp.
B)Exserohilum spp.
C)Pseudallescheria boydii
D)Exophiala dermatitidis

Answer 2

C
Mycetoma is a chronic granulomatous infection that usually involves the lower extremities but may also occur in any part of the body.The infection is characterized by swelling,purplish discoloration,tumorlike deformities of the subcutaneous tissue,and chronic sinus tract infections that drain pus containing yellow,white,red,or black granules.P.boydii is one organism that can cause this disease state.

Question 3

Match the microscopic characteristics with their organism.
a.Phialophora
b.Fonsecaea
c.Alternaria
d.Bipolaris
e.Cladophialophora
f.Culvaria
g.Exophiala
Conidiophores are bent at the locations where conidia are attached;conidia are sympodially arranged and are oblong to fusoid in shape.

Answer 3

D

Question 4

Match the microscopic characteristics with their organism.
a.Phialophora
b.Fonsecaea
c.Alternaria
d.Bipolaris
e.Cladophialophora
f.Culvaria
g.Exophiala
Conidia are arranged sympodially,golden brown,multicelled,and curved with a central swollen cell.

Question 5

MATCHING
Match each disease state with the organism that causes it.
a.E.jeanselmei
b.P.boydii
c.Piedraia hortae
d.H.werneckii
e.Alternaria
Tinea nigra

Question 6

Which dematiaceous fungus causes a condition known as chromoblastomycosis?

A)P.boydii
B)Hortaea werneckii
C)Phialophora spp.
D)Exophiala jeanselmei

Question 7

Match the microscopic characteristics with their organism.
a.Phialophora
b.Fonsecaea
c.Alternaria
d.Bipolaris
e.Cladophialophora
f.Culvaria
g.Exophiala
Conidiophores bear a chain of large brown conidia,resembling a drumstick,and contain both horizontal and longitudinal septa.

Question 8

Match the microscopic characteristics with their organism.
a.Phialophora
b.Fonsecaea
c.Alternaria
d.Bipolaris
e.Cladophialophora
f.Culvaria
g.Exophiala
Conidial heads with a sympodial arrangement of conidia exhibit primary conidia giving rise to secondary conidia.

Question 9

MATCHING
Match each disease state with the organism that causes it.
a.E.jeanselmei
b.P.boydii
c.Piedraia hortae
d.H.werneckii
e.Alternaria
Sinusitis

Question 10

Match the microscopic characteristics with their organism.
a.Phialophora
b.Fonsecaea
c.Alternaria
d.Bipolaris
e.Cladophialophora
f.Culvaria
g.Exophiala
Feltlike,filamentous colonies produce dematiaceous hyphae and conidiophores that are cylindrical and have a tapered tip.

Question 11

MATCHING
Match each disease state with the organism that causes it.
a.E.jeanselmei
b.P.boydii
c.Piedraia hortae
d.H.werneckii
e.Alternaria
Black-grain mycetoma

Question 12

Match the microscopic characteristics with their organism.
a.Phialophora
b.Fonsecaea
c.Alternaria
d.Bipolaris
e.Cladophialophora
f.Culvaria
g.Exophiala
Conidia are usually single celled and exhibit prominent attachment scars (disjunctors).

Question 13

Match the microscopic characteristics with their organism.
a.Phialophora
b.Fonsecaea
c.Alternaria
d.Bipolaris
e.Cladophialophora
f.Culvaria
g.Exophiala
This fundus exhibits cup- or flask-shaped collarette.

Question 14

An agricultural worker is punctured by a tool used in the field.An infection,characterized by the development of a papule that is similar to a cauliflower appearance,develops.The worker is most likely suffering from which type of infection?

A)Mycetoma
B)Chromoblastomycosis
C)Tinea nigra
D)Black piedra

Question 15

MATCHING
Match each disease state with the organism that causes it.
a.E.jeanselmei
b.P.boydii
c.Piedraia hortae
d.H.werneckii
e.Alternaria
Black piedra

Question 16

MATCHING
Match each disease state with the organism that causes it.
a.E.jeanselmei
b.P.boydii
c.Piedraia hortae
d.H.werneckii
e.Alternaria
White grain mycetoma