Two Yale pathologists have identified what they believe to be two new types of pneumonia.
One form, reported by Averill Liebow, MD, and Charles B. Carrington, MD, to a medical meeting in Cleveland, is characterized primarily by a massive infiltration and proliferation of lymphocytes in both lungs.
Although little is known about the syndrome called lymphocytic interstitial pneumonia (LIP), it apparently is chronic. In one of six patients in whom it has been observed, the duration to date is nine years.
Even less is known about the other new form, which Dr. Liebow described in a JAMAMedical News interview. As yet, this type has no name; however, Dr. Liebow said it may be considered a diffuse interstitial pneumonia with bronchiolitis obliterans.
Similar to some other forms of chronic interstitial pneumonia, the latter type is characterized by the Hamman Rich syndrome—rapidly progressive dyspnea and cyanosis. This new, as yet unnamed