A 65-year-old man, hospitalized because of general weakness and striking weight-loss, was found by roentgenography to have pulmonary lesions suggesting metastases of a tumor. Intravenous pyelography gave evidence of a malignant tumor of the left kidney. A nephrectomy was performed, and the lesion proved to be a clear-cell serous papillary cystic adenocarcinoma. The condition of the patient remained poor for about three months, and the pulmonary lesions increased in size and number. The patient then improved, and at the time of discharge from the hospital the pulmonary lesions were no longer visible. Similar observations have been made in the past. They suggest the hypothesis that these tumors have distinctive properties as to origin and biological activity.
Kessel L. SPONTANEOUS DISAPPEARANCE OF BILATERAL PULMONARY METASTASES: REPORT OF A CASE OF ADENOCARCINOMA OF KIDNEY AFTER NEPHRECTOMY. JAMA. 1959;169(15):1737–1739. doi:10.1001/jama.1959.03000320039010
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