Primary cardiac lipoma: a clinicopathological analysis

Figures

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  Fig. 1. Fig. 1: Conventional echocardiography reveals a 41 × 37 mm hypoechoic solid mass (A, red arrow) in the right atrium, slightly displaced toward the right. Left ventricular echogenic contrast imaging shows a 37 × 28 mm echogenic mass (B, red arrow) with minimal low enhancement, well-defined margins, and a 23 mm base connected to the right atrial wall

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  Fig. 2. The CT scan reveals a fat accumulation mass at the lower margin of the right atrium (red arrow, A: Non-contrast chest CT soft tissue sequence; B: Non-contrast chest CT lung tissue sequence; C: Non-contrast coronary CT; D: Contrast-enhanced coronary CT.)

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  Fig. 3. The 3D coronary CT reconstruction shows that the middle and distal segments of the right coronary artery partially pass through or bypass a lipoma or fat accumulation mass at the lower margin of the right atrium (red arrow, A: Posterior view, B: Lateral view.)

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  Fig. 4. MRI of the heart: A nodular short T1 (red arrow, A) and long T2 (red arrow, B) signal shadow on the right atrial surface of the atrial septum, measuring approximately 44 × 32 × 32 mm, with absent signal on T1 fat-saturated sequence and no enhancement, suggesting a lipomatous tumor

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  Fig. 5. Gross examination of the tumor from Case 3 shows a partially encapsulated, soft, yellowish-tan mass with a greasy cut surface

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  Fig. 6. Microscopic examination reveals a well-defined mass with a complete fibrous capsule. H&E × 4.4

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  Fig. 7. Adipocytes are interspersed with small blood vessels. H&E × 17.8

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  Fig. 8. Adipocytes are uniform in size, with cytoplasm filled with lipid droplets and small nuclei, showing no atypia. H&E × 200