El objetivo es ilustrar al lector sobre un tumor infrecuente en la literatura médica y resumir los conocimientos actuales que se tienen sobre esta patología. Caso clínico: Reportamos el caso de un varón en la quinta década de la vida, a quien se realizó ecocardiograma transtorácico por deterioro de la clase funcional. La ultrasonografía evidenció un tumor que ocupaba el 95% de la aurícula izquierda, con compromiso hemodinámico e hipertensión pulmonar grave. Luego de estudios de extensión, fue llevado a cirugía para extracción de la masa por esternotomía media. La patología reveló sarcoma de alto grado indiferenciado sin compromiso linfovascular. This text aimed to illustrate the reader about one of the most infrequent tumors in the medical literature and discuss based on current literature what is known to date of this pathology. Case report: We report the case of a male in the fifth decade of life, who underwent transthoracic echocardiography due to impairment of the functional class. Ultrasound showed tumor lesion that occupied 95% of the left atrium, with hemodynamic compromise and severe pulmonary hypertension. After extension studies, he was taken to surgery with total mass extraction by middle stereotomy. The pathology revealed undifferentiated high-grade sarcoma without lymphovascular involvement.
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