Lymphomatoid papulosis: a cutaneous T-cell pseudolymphoma.

It was the purpose of this study to further define the nature of the dermal infiltrates in lymphomatoid papulosis (LP) means of enzyme cytochemistry (acid phosphatase and esterase), immunology (rosetting techniques, immunoperoxidase technique on cryostat sections), and by semithin and ultrathin sections. The studies performed on biopsy samples with clinically and histologically typical LP indicated that most lymphoid cells display markers for T-lymphocytes, which were helper T-cells in the one case studied with monoclonal antibodies. Regarding the typical benign self-involutive clinical course, LP is considered to be a cutaneous pseudolymphoma of T-cell type.