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The fibrillar immunofluorescent pattern of IgA deposition in dermatitis herpetiformis is considered by most authorities to be a variant of the granular IgA pattern. It has been hypothesized that the fibrillar vs the granular pattern is related to longitudinal vs transverse sectioning of affected dermal microfibril bundles. However, direct evidence for this possibility has yet to be presented. Confocal laser scanning microscopy and immunoelectron microscopy were performed to determine the anatomical distribution of fibrillar IgA deposits, using skin specimens from a patient with typical fibrillar IgA deposition.