Wesley Murfin, MD, Assistant in Medicine, Department of Medicine, Jewish Hospital of St Louis, Washington University School of Medicine: A 20-year-old white female subject was in good health until September of this year. On Aug 24, 1975, she was delivered of a normal 3.15-kg baby vaginally, following an entirely normal pregnancy, and apparently normal immediate postpartum course. On Sept 4, ten days following delivery, she was seen in a hospital in Illinois complaining of the abrupt onset of pleuritic left-sided chest pain. A chest film initially showed nodular infiltrates in the upper lobe of the left lung. She was hospitalized and a second chest x-ray film several days later evidenced progression of the nodular infiltrates throughout both lung fields and a small left pleural effusion. Perfusion scan was normal. Results of sputum cultures, purified protein derivative (PPD), fungal skin tests, VDRL, and a "collagen vascular disease" screen were all unremarkable