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Mycosis fungoides with pulmonary involvement. Cytopathologic findings.

In order to define the cytologic features of pulmonary involvement by mycosis fungoides, 15 respiratory cytology specimens from four patients with biopsy-proven pulmonary mycosis fungoides were reviewed. The presence in sputum smears of occasional small or large cerebriform mononucleated cells against a background of numerous atypical lymphocytic cells permitted an antemortem cytologic diagnosis of probable or definite dissemination of mycosis fungoides with pulmonary involvement. Similar cells were seen in aspiration smears. The lymphocytic infiltrates were similar to those in corresponding skin biopsies in each case. The distinctive cytologic findings in these cases may therefore help to determine the underlying etiology of pulmonary lesions and may contribute to the antemortem diagnosis of visceral dissemination of mycosis fungoides.