Table 1. Extension of metastatic tumors into the left atrium via invasion of pulmonary veins.

Case	Reference	Age at diagnosis of extension	Sex	Tumor type	Symptom at diagnosis	Treatment for intra-atrial tumor	Consequence after diagnosis
1	Funakoshi Y et al. (present study)	31	M	Ewing sarcoma	None	Palliative operation	Alive (6 mo AO)
2	Collins et al.4	57	F	Leiomyo sarcoma	None	None*	Arterial occlusion and stroke soon after detection*
3	Woodring et al.5	64	M	Chondrosarcoma	Headache, left-side facial drop	(Refused surgery) Palliative RT and adriamycin	Died from metastases (9 mo AD)
4	Ishibashi et al.6	63	F	Malignant fibrous histiocytoma	None	CR	Alive (15 mo AO)
5	Heslin et al.7	23	F	Synovial sarcoma	None	CR	Alive (16 mo AO)
6	Gandhi et al.8	63	M	Osteosarcoma	Hemiplegia	Best supportive care	Not described
7	Senbo et al.9	35	F	Osteosarcoma	Palpitation, syncopal attack	CR, adjuvant cisplatin	Died from metastases (11 mo AO)
8	Vargas-Barron et al.10	55	F	Carcinoma of the cervix	Hemiplegia, aphasia	CR	Alive and well (2 y AO)
9	Gardner et al.11	28	M	Chondrosarcoma	Chest pain	CR	Died from local recurrence, lung (10 mo AO)
10	Boland et al.12	26	M	Chondrosarcoma	Hemiplegia, pleuristic chest pain, shortness of breath	CR	Died from metastases (4 mo AO)
11	Maclowry et al.13	28	F	Chondrosarcoma	Headache, facial weakness, blurred vision	Chemotherapy	Died from brain metastases (23 d AS)

All surgeries were conducted under cardiopulmonary bypass.

^*Soon after detection by X-ray and CT scan, the patient developed systemic emboli (peripheral arterial occlusion and stroke).

Treatment was an embolectomy for peripheral occlusion. Prognosis and follow-up period were not described.

RT, radiation therapy; CR, complete resection (gross complete resection); AO, after operation; AD, after detection; AS, after symptoms.