Spontaneous Regression of a Pulmonary Metastasis Secondary to Contralateral Metastasectomy.

Spontaneous regression is defined as the partial or complete resolution of a malignant neoplasm either with treatment that is perceived to be inadequate or in the absence of therapy. This report describes a case of spontaneous regression of a pulmonary metastasis of renal cell carcinoma secondary to metastasectomy in the contralateral lung.