CT appearances of relapse of lymphoma in the lung.

The patterns of pulmonary relapse were studied in 15 patients with Hodgkin's disease and one patient with Non-Hodgkin's lymphoma. All the patients with Hodgkin's disease had mediastinal lymphadenopathy at initial diagnosis. For those patients with no prior episodes of relapse the mean time to pulmonary involvement was 2 years 11 months compared to over 8 years for those who first relapsed elsewhere. Thirteen patients are still alive; five have been followed up for more than 2 years. Pulmonary involvement consisted of: 1. nodules, either central (12 patients) or peripheral (10 patients), often with connection to the pleura or mediastinum, and sometimes with cavitation; 2. consolidation with or without cavitation (four patients); 3. mediastinal extension into the lung parenchyma (three patients). In seven patients there was evidence of newly enlarged mediastinal nodes. Pleural effusions or masses were seen in six patients and pericardial involvement in one. The chest wall was involved in five. A combination of three or more of these signs were present in 11 patients. The pattern of involvement seen in the patient with Non-Hodgkin's lymphoma was indistinguishable from that seen in Hodgkin's disease. This study has demonstrated a variety of CT appearances useful in establishing or suggesting the diagnosis of pulmonary relapse. Enlarged mediastinal nodes were not a prerequisite but had been present in all patients at some stage in the course of the disease.