Diffuse alveolar hemorrhage syndrome due to 'silent' mitral valve regurgitation.

A variety of clinical diseases are associated with diffuse alveolar hemorrhage. Although mitral valve disease can cause hemoptysis, it rarely is associated with diffuse alveolar hemorrhage at presentation. A 49-year-old woman was admitted to the hospital with the abrupt onset of fever, anemia, dyspnea, azotemia, and diffuse alveolar infiltrates. Two-dimensional echocardiography done several months earlier to evaluate atypical chest pain had been unremarkable. Fiberoptic bronchoscopy 2 days after admission to the hospital revealed fresh blood throughout the tracheobronchial tree. The infiltrates resolved rapidly and completely during systemic steroid therapy only to reappear as the steroids were tapered, suggesting a beneficial therapeutic response. Results of serologic evaluation were negative. Transbronchial biopsies showed inflammation and hemosiderin-laden macrophages; no specific diagnosis was established. The patient was scheduled for open lung biopsy. The surgeon was concerned about the history of chest pain and requested placement of a pulmonary artery catheter, which revealed severe pulmonary hypertension. Transesophageal echocardiography and subsequent cardiac catheterization showed severe mitral regurgitation. Mitral valve replacement resulted in complete elimination of symptoms.