Direct immunofluorescence of a skin biopsy shows IgA deposits in a 'granular' pattern at the tips of dermal papillae. This is diagnostic for:
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Correct answer: Dermatitis herpetiformis
Dermatitis herpetiformis is strongly associated with celiac disease. The IgA deposits at the papillary tips lead to microabscesses and subepidermal blister formation.
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