PMC10364321_01
(A) Transthoracic echocardiography, parasternal long axis view. A broad-based mass is filling the left atrium and protruding into the LV cavity during diastole. (B) Transesophageal echocardiography, systole. The mass which is composed of three different parts are shown. (C) Transesophageal echocardiography, diastole. The mixed portion of the mass is protruding into the LV cavity during diastole. (D) Thoracoabdominal computed tomography reveals an intracardiac mass occupying the left atrium. LV, left ventricle.
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F1
Transthoracic echocardiography (Figure 1A) revealed a broad-based mass filling the left atrium that was attached to its posterior wall near the Q tip. Transesophageal echocardiography (Figures 1B,C) clearly revealed the heterogeneous features of the mass. Thoracoabdominal computed tomography (CT) (Figure 1D) revealed an intracardiac mass occupying the left atrium without local invasion and no evidence of distant metastasis.
Gross photograph of the mass. (A,B) A 7 cm x 5 cm x 4 cm sized huge mass with multilobulated one hard portion and two cystic portion was surgically removed.
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F2
During surgery, a 7 cm x 5 cm x 4 cm mass was observed, which had a hard part originating from the nearby left atrial appendage and two cystic parts (Figures 2A,B).
Photomicrograph of the mass. (A) The cellular anaplastic area is mixed with cartilage and atypical cells (hematoxylin and eosin staining, X100). (B) Atypical pleomorphic osteoblasts are observed, and a cellular anaplastic area with cartilage is present (hematoxylin and eosin staining, X400).
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F3
On pathological examination, the tumor consisted of proliferating pleomorphic spindle-shaped cells, suggesting a sarcoma, and massive osteoid and chondroid materials were produced by the tumor cells (Figures 3A,B).