Expanding cardiac pseudotumor

FIGURE 1. Computed tomography scans. Long-axis images show dense calcification attached to the left ventricular endocardium and mitral annulus. LA, Left atrium; LV, left ventricle; A, Anterior; P, posterior; X, calcific mass. CLINICAL SUMMARY A 75-year-old woman presented with episodic presyncope associated with palpitations. She was diabetic and hypertensive with a history of rheumatic fever with associated valvular dysfunction. Physical examination revealed an irregular pulse rate of 82 beats/min and no signs of left heart failure. On auscultation, a soft diastolic murmur was heard. Biochemical investigation results were all within normal limits, including serum calcium, parathormone levels, and proteins C and S. Electrocardiography confirmed atrial fibrillation and showed periods of sinus rhythm and firstdegree heart block. In-hospital telemetry demonstrated episodes of complete heart block rate that required permanent pacemaker. Transthoracic and transesophageal echocardiography showed the presence of a large echogenic mass at the basal inferior wall and inferoposterior mitral annulus extending into both the interventricular and interatrial septae. The mass appeared encapsulated, intramyocardial, and extensive (5.4 3 4.2 cm). The posterior mitral valve leaflet was clearly compressed by the mass, causing mild mitral stenosis and mild mitral regurgitation. Left ventricular function was preserved. Transthoracic echocardiography, performed 3 years previously to investigate a diastolic murmur, revealed a 2.5 3 1.8-cm calcific mass behind the posterior mitral valve leaflet. The patient was lost to follow-up. Computed tomography (Figure 1) of the chest and cardiac magnetic resonance imaging confirmed the presence