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NBME 16 Answers

nbme16/Block 3/Question#3 (reveal difficulty score)
An 83-year-old man comes to the physician ...
Bullous pemphigoid antigen ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: derm repeat

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submitted by โˆ—bingcentipede(356)
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The stem is describing bullous pemphigoid, which produces IgG antibodies hemidesmosomes. (PV is IgG antibodies aginst desmoglein-1 and desmoglein-3, in the oral mucosa).

BP produces the tense blisters that have a negative Nikolsky sign (don't rupture with rubbing). This is because they're supepidermal. Surprised they didn't ask about hemidesmosomes, but I think that that the BP antigen is part of the hemidesmosomes and recruits the autoantibodies.

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i_hate_it_here  New stem was describing Bullous pemphigoid, just never heard of BP antigen lol +3
taylor5479  Same here. I have literally never heard of "bullous pemphigoid antigen" lol +
chaosawaits  FA2019 page 465: it talks about "bullous pemphigoid antibodies." Antibodies have antigens. Plus, desmoplakin and plakoglobin are components of desmosomes, which is pemphigus vulgaris. I also almost got torn away by BP antigen though. +



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