General MCQ Flashcards
7 cards from real ABD practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 General MCQ flashcards as text
Which dermatophyte finding on KOH prep confirms a diagnosis of tinea?
Answer: Septate branching hyphae
Dermatophyte infections show septate, branching hyphae on KOH microscopy.
The 'spaghetti and meatballs' appearance on KOH is characteristic of which organism?
Answer: Malassezia furfur
Malassezia furfur, the cause of tinea versicolor, produces the short hyphae and round spores described as spaghetti and meatballs.
Which cutaneous finding is a recognized marker of internal malignancy?
Answer: Acanthosis nigricans
Sudden, widespread acanthosis nigricans can be a paraneoplastic sign, classically of gastric adenocarcinoma.
A dermatologist notes Wickham striae on violaceous, flat-topped papules on the wrists. What is the diagnosis?
Answer: Lichen planus
Purple, polygonal, pruritic, planar papules with fine white reticular Wickham striae are diagnostic of lichen planus.
Which layer of the epidermis is absent in thin skin but present in thick skin such as the palms?
Answer: Stratum lucidum
The stratum lucidum is a translucent layer found only in thick, glabrous skin of the palms and soles.
A biopsy shows a subepidermal blister with linear IgG and C3 along the basement membrane. What is the diagnosis?
Answer: Bullous pemphigoid
Bullous pemphigoid shows subepidermal tense blisters with linear IgG and C3 deposition targeting hemidesmosomal antigens.
Which malignant melanoma subtype is most common on the palms, soles, and nail beds, particularly in darker-skinned patients?
Answer: Acral lentiginous melanoma
Acral lentiginous melanoma arises on palms, soles, and subungual sites and is the most common melanoma subtype in people with darker skin.