It presents a 59 years old woman with atypical symptoms, which orientated the diagnostic thinking during one year to a reccurrent pneumonitis, bronchial asthma, colagenosis, interstitial pulmonary fibrosis and so on. The appearance of pulmonary edema determined a couple of cardiologic exams which came to obiectivate as the main cause, the existence of a left atrial mixoma who was invaginated in left mitral cusp. Surgical intervention permitted not only specific determination of histological type of tumor, but lead to healing of the patient. It is a discussion over epidemiology, clinical areas of manifestation and methods of diagnostic of atrial tumors.
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