Thirty-seven-year-old woman with a two-week history of cough, dyspnea with exertion, fatigue, and fever. She developed respiratory failure and was hospitalized. Posteroanterior roentgenogram reveals bilateral patchy opacities and volume loss. An open lung biopsy confirmed an extensive COP pattern. There was complete resolution following glucocorticoid therapy without recurrence after glucocorticoids were discontinued.
