title: Spontaneous disappearance of a right atrial mass.
mesh_terms: D000293:Adolescent; D003937:Diagnosis, Differential; D004452:Echocardiography; D006325:Heart Atria; D006338:Heart Neoplasms / Q000175:diagnosis*; D006801:Humans; D008297:Male; D013923:Thromboembolism / Q000175:diagnosis