Mollaret's meningitis: a case with increased circulating natural killer cells.

A patient with longstanding Mollaret's meningitis had an increased number of circulating natural killer cells during an acute attack, as evidenced by 73% large granular lymphocytes and 80% Leu-11a-positive peripheral mononuclear cells. Numbers of large granular lymphocytes and Leu-11a-positive cells returned to normal by three months after the attack. Similarity of the morphological features of the Mollaret's cell to those of large granular lymphocytes is noted.