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Poststeroid panniculitis pathology

Author: Assoc Prof Patrick Emanuel, Dermatopathologist, Auckland, New Zealand. January 2015.

Poststeroid panniculitis pathology — codes and concepts

Poststeroid panniculitis is a rare complication of systemic corticosteroid therapy. Clinically, erythematous nodules and indurated plaques develop on the cheeks of children within days or weeks following rapid systemic steroid tapering or cessation.

Histology of poststeroid panniculitis

Poststeroid panniculitis presents as lobular panniculitis with a mixed inflammatory infiltrates without vasculitis. Needle-shaped crystals within adipocytes are characteristic (figure 1). The clefts may be surrounded by foreign body giant cells.

Poststeroid panniculitis pathology

Special studies for poststeroid panniculitis

None are generally needed.

Differential diagnosis of poststeroid panniculitis

The clinical history of abrupt steroid withdrawal is helpful.

Sclerema neonatorum – This shows identical crystals but there is minimal associated infiltrate or reaction.

Subcutaneous fat necrosis of the newborn – This can be histologically identical and may need clinical correlation for confident distinction

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