We have recently had the opportunity to follow a case of chylopneumothorax. A review of the literature reveals chylothorax due to any cause to be a rare condition, but we have been unable to find any case of chylopneumothorax in the American or British journals. REPORT OF A CASE J. P., a 64-year-old white male odd-job worker, was referred to the Rhode Island Hospital because of chest pain and dyspnea. The patient said he had been in good general health for the previous five years but had had a mild cough productive of about two teaspoonsful of clear phlegm per day that had been present for several years. It had not changed in the past year, and there was no hemoptysis. He stated he had not been exposed to tuberculosis. Three days prior to admission there was a sudden onset of moderately severe substernal and epigastric pain while he was