A subtle clue to the histopathologic diagnosis of early alpha 1-antitrypsin deficiency panniculitis.

An excisional biopsy specimen of a lesion of several days' duration in an 18-year-old woman revealed moderate splaying of neutrophils between collagen bundles throughout the reticular dermis and incipient necrosis of the dermis and subcutaneous fat. Mild infiltration of neutrophils and macrophages was seen in the septal and lobular panniculus. A biopsy performed on one of the patient's more chronic lesions demonstrated dermal necrosis, degeneration and fibrosis of septa, acute lobular panniculitis with a large number of neutrophils, and foci of subcutaneous fat necrosis with islands of sparing. Splaying of neutrophils between the collagen bundles in the reticular dermis appears to be the earliest histopathologic finding of alpha 1-antitrypsin deficiency panniculitis.