S12C13P3-1: Tubercle-like aggregates of epithelioid histiocytes are closely clustered in the dermis. Necrosis is not a feature. Infiltrates of lymphoid cells are not a feature (foreign body reaction to glass [silica]).

S12C13P3-2: Epithelioid histiocytes are closely aggregated. Lymphoid cells are not a significant feature (foreign body granuloma in tubercle-like patterns).

S12C13P3-3: Under polarized light, there are numerous birefringent foreign bodies. Somewhat similar material, so-called conchoid bodies, may be found in lesions of sarcoidosis, but generally are not as prominent. In addition, in lesions of sarcoidosis, the birefringent particles are rarely as large as some of these particles. The lesion involved the site of injury in a car wreck; in the accident, the patient’s head had collided with the windshield. The accident preceded the skin lesion by a number of years.

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