Lymphangitis carcinomatosa of the lungs.
1. Twenty-four cases of lymphangitis oarcinomatosa of the lungs are reported, and their clinical, radiological, and autopsy features are briefly described.

2. The condition may be suspected on clinical grounds, but of several possible radiological appearances only one is diagnostic.

3. The site and nature of the primary tumour in these cases, together with 154 cases reported elsewhere, are summarized, and the frequency of lymphangitis carcinomatosa with various primary tumours is noted.

4. The possible routes of spread of neoplastic cells to the lungs and the cause of the characteristic breathlessness are discussed.