Stereotactic Radiosurgery in Treating Patients With Liver Metastases, Lung Metastases, or Other Advanced Solid Tumors

DISEASE CHARACTERISTICS: * Histologically or cytologically confirmed malignancy * Extracranial recurrent or metastatic disease or primary tumor not predicted to be controlled with standard radiotherapy * Incurable with any standard therapy * No tumors involving critical structures (e.g., mucosal surfaces (bowel or bladder) or heart) * Tumor visible by CT scan PATIENT CHARACTERISTICS: Age: * Not specified Performance status: * Karnofsky 60-100% Life expectancy: * Not specified Hematopoietic: * Not specified Hepatic: * Bilirubin less than 2.0 times upper limit of normal (ULN) * AST and ALT less than 5 times ULN Renal: * Creatinine less than 2.0 mg/dL Pulmonary: * FEV1 greater than 0.75 L Other: * No unsuitable size or geometric proportion that would preclude stereotactic immobilization * Not pregnant or nursing * Fertile patients must use effective contraception PRIOR CONCURRENT THERAPY: Biologic therapy: * At least 14 days since prior anticancer biologic therapy and recovered Chemotherapy: * At least 14 days since prior anticancer chemotherapy and recovered Endocrine therapy: * At least 14 days since prior anticancer endocrine therapy and recovered Radiotherapy: * See Disease Characteristics * At least 14 days since prior anticancer radiotherapy and recovered Surgery: * Not specified