“…Other underlying tumor types, such as unclassified malignant mesenchymoma ( 5 ), small medullary carcinoma of the thyroid ( 10 ), hepatocellular carcinoma ( 20 ), leiomyoma ( 23 ), malignant fibrous histiocytoma ( 26 ), and possible alveolar soft part sarcoma ( 27 ) and leiomyosarcoma ( 30 ), have also been reported. Arteriovenous fistulas associated with tumors might not be uncommon; the incidence of the involvement of arteriovenous fistula in renal cell carcinoma is reported to be 12-50% ( 34 , 35 ). However, it seems quite rare for congestive heart failure to develop because of this.…”