Summary of Mycoses Flashcards

1
Q

Superficial mycoses

A

pityriasis versicolor

tinea nigra

white piedra

black piedra

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2
Q

Pityriasis versicolor

A

Discrete, serpentine, hyper or hypopigmented maculae occur on the skin usually on the chest, upper back, arms or abdomen

  • Chronic lesions are chronic occurring as macular patches of discolored skin that may enlarge and coalesce
  • Minimal scaling, inflammation, and irritation

Malassezia globosa, M. restricta and other members of the M. furfur complex

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3
Q

Tinea Nigra

A
  • Lesions are chronic
  • appear as dark (brown to black) discoloration often on the palm due to melanin
  • Patients usually asymptomatic
  • Hortaea (Exophiala) werneckii
  • Branched, septate hyphae and budding yeast cells with melaninized cell walls
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4
Q

White piedra

A
  • Larger, softer, yellowish nodules on the hair
  • Trichosporon sp.
    • Appears with arthroconidia
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5
Q

Black piedra

A
  • Nodular infection of the hair shaft
  • Piedraia hortae
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6
Q

Cutaneous Mycoses

A
  • Dermatophytosis
    • Tinea corporis
    • Tinea unquium
    • Tinea pedis
    • tinea cruris
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7
Q

Tinea Corporis

A
  • Cylindrical, club-like
  • smooth walled macroconidia
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8
Q

Tinea pedis

A
  • Microsporum
    • distinctive spindle shaped macroconidia with achinulate spiny walls
  • Found in area with sweat accumulation
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9
Q

Tinea cruris

A
  • Epidermophyton floccosum
    • produce only macroconidia that are smooth walled, clavated (curved)
    • found in clusters
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10
Q

Endemic/ systemic mycoses

A
  • Histoplasmosis
  • Coccidiodomycosis
  • Blastomycosis
  • Paracoccidiodomycosis
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11
Q

Histoplasmosis

A
  • TB-like symptoms (coughing, fever, body malaise
    • Diagnosed by sputum smear
  • Histoplasma capsulatum
    • Mold form with spiked/echinulate morphology
    • Oval yeasts, 2 x 4 μm, intracellular in macrophages
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12
Q

Coccidiodomycosis

A

Valley Fever, San Joaquin Valley Fever, Desert bumps/ rheumatism, Posadas’ disease

  • TB like symptoms (coughing, fver, malaise)
  • Coccidioides posadassi or Coccidioides immitis
    • most virulent because of dimorphism
    • spherules (10-80 μm), containing endospores
    • 2-4μm
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13
Q

Blastomycosis

A
  • Blastomyces dermatitis
    • thermally dimorphic
    • becomes single-budding yeast cell at 37C
    • Thick walled yeasts containing broad base, usually single buds, 8-15 um
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14
Q

Paracoccidioidomycosis

A
  • Chronic granulomatous
  • Destruction of facial features
  • Paracoccidioides brasilensis
    • Thermally dimorphic
    • Steering wheel appearance
    • Large, multiplying budding yeasts, 15-30 um
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15
Q

Opportunistic mycoses

A
  • Candidiasis
  • Cryptococcosis
  • Aspergillosis
  • Mucormycosis
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16
Q

Candidiasis

A
  • Candida albicans
    • normal flora of skin and mucosa
    • Displays
      • pseudohypae
      • chlamyoconidia
      • blastoconidia
      • yeast-like spores
17
Q

Cryptococcosis

A
  • Cryptococcus neoformans
    • present in the air
      • decaying plants
      • pigeon droppings
    • related to meningitis
    • hyphal elements in sputum
18
Q

Aspergillosis

A
  • In x-ray, check for opacities
  • Aspergillus fumigatus
    • with phialoconidia from phialides
19
Q

Mucormycosis

A

Pneumocystis carinii

20
Q
A