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A 27-year-old man diagnosed with right ventricular metastasis of Ewing sarcoma was referred to our institution. We surgically resected the metastatic tumor to prevent sudden death and reconstructed the right ventricle and tricuspid valve. He has survived for 1 year postoperatively without recurrence.

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Anatomy: We aim to review the anatomy of the moderator band (MB) and the trabeculated right ventricle (RV).

Pathology: We thoroughly describe the morphological variations of the MB and its spatial relationship with the right ventricular anterior papillary muscle, its muscular trabeculations, and the free wall.

Imaging Correlation: We provide echocardiography, computed tomography, and magnetic resonance imaging to better understand histologic specimens of the MB, the trabeculated RV, and the right ventricular papillary muscles.

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Article Synopsis
  • Primary cardiac tumors (PCTs) like myxomas and lipomas are rare, with lipomas being soft fat masses that can lead to diagnostic challenges.
  • Lipomatous hypertrophy of the atrial septum (LHAS) is a benign condition linked to aging and obesity, distinct from true cardiac lipomas.
  • A case of a true atrial septal lipoma discovered during heart dissection is detailed, highlighting its potential effects on heart function and contributing to the scarce literature on benign primary cardiac tumors.
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The complex architecture of the papillary muscles (PMs) of the ventricles plays a crucial role in cardiac function and pathology. This comparative study aimed to examine the differences in PMs morphology between the right and left ventricles, focusing on their number, location, and shape. A total of 38 grossly normal hearts from donated bodies were dissected, and the number, location, and shape of PMs in both ventricles were observed.

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