Primary malignant melanoma of the lung

A case of primary malignant melanoma of the lung in a 42-year-old white female is presented. A 6 cm localized mass in the left lower pulmonary lobe was discovered on a thoracic spine X-ray done for unrelated chronic back pain. The patient underwent left lower lobectomy for cure. Multiple detailed physical examinations did not disclose any primary lesions. Other cases from the English literature are reviewed briefly.