17 Questions
Which of the following is a characteristic morphological appearance of Malassezia furfur in potassium hydroxide (KOH) preparations of skin scrapings?
Spaghetti and meatballs appearance
What is the characteristic fluorescence observed under Wood's lamp for lesions caused by Malassezia furfur?
Golden yellow fluorescence
Which of the following conditions is NOT associated with Malassezia furfur?
Candidiasis
What is the characteristic morphology of Malassezia spp. cells observed in Gram stain preparations from culture?
Oval or bottle-shaped cells with monopolar budding and a septum at the bud scar
Which of the following conditions is also known as 'Malassezia catheter-associated sepsis'?
Systemic infection
Which of the following conditions is mentioned in the text as being associated with Malassezia furfur?
Eczema/dermatitis syndrome atopic
What is the etiologic agent responsible for pityriasis versicolor?
Malassezia furfur complex
What is the most common presentation of pityriasis versicolor?
Fawn-colored macules
Which of the following best describes Malassezia furfur?
Lipophilic yeasts that require lipid in the medium for growth
What type of infection is pityriasis versicolor in immunologically normal patients?
Superficial infection of the stratum corneum
Which skin areas are commonly affected by pityriasis versicolor?
Trunk and upper arms
Which of the following is the most common agar medium used to culture Malassezia furfur?
Sabouraud dextrose agar
What is the typical appearance of Malassezia furfur colonies on SDA with oil overlay?
Dry, white to off-white colonies
Which of the following is the most common laboratory diagnostic method for Tinea nigra?
Direct KOH or calcofluor white examination
What is the primary etiologic agent of Tinea nigra?
Hortaea (Exophiala) werneckii
Which of the following is a common clinical feature of Tinea nigra?
Blackish-brown macular patches
Which of the following is a common treatment for Pityriasis versicolor (caused by Malassezia furfur)?
Topical selenium sulfide
Test your knowledge on Malassezia infections, including its role in different skin conditions like folliculitis, seborrheic dermatitis, and eczema. Learn about laboratory diagnosis techniques such as the 'spaghetti and meatballs appearance' in KOH preparations and the fluorescence under Wood's lamp.
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