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Dermatology · Connective tissue disease: subacute cutaneous lupus
Sample itemA photosensitive woman has annular, psoriasiform lesions on the shoulders and upper back, and her newborn later has congenital heart block. Which antibody is most likely present?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
D. Anti-Ro (SSA)
Subacute cutaneous lupus erythematosus is strongly associated with anti-Ro/SSA, which can cross the placenta and cause neonatal lupus with congenital heart block. Drugs such as hydrochlorothiazide may trigger it.
Option by option
A. Anti-Jo-1
Anti-Jo-1 is linked to antisynthetase syndrome.
B. Anti-centromere
Anti-centromere is linked to limited systemic sclerosis.
C. Anti-Scl-70
Anti-Scl-70 is linked to diffuse systemic sclerosis.
D. Anti-Ro (SSA) (correct)
Correct. Anti-Ro/SSA is linked to SCLE and neonatal lupus.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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