A CASE OF PULMONARY MALIGNANT MELANOMAS WITHOUT ANY LESIONS IN OTHER ORGANS

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  • 肺のみに病変が認められた悪性黒色腫の１切除例

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Abstract

A 51-year-old man who had an abnormal shadow on chest roentgenogram by mass screening was admitted to our hospital. Chest CT scan revealed two pulmonary nodules in right S9 and left S9. CT-guided lung biopsy of the right tumor revealed a kind of sarcoma pathologically. Another lesion was not detected by positron emission tomography. Thoracoscopical partial lung resection and segmental lobectomy were performed for right lung tumor and left lung tumor, respectively. Those tumors were diagnosed as malignant melanoma immuno-histochemically. A systemic examination was done again, but there were no lesions except for the lung. Therefore, we diagnosed this case as melanoma of unknown primary origin or primary melanoma of the lung accompanied with a pulmonary metastasis. There was no recurrence in this patient, 22 months after the operation. Although melanoma with metastases has a poor prognosis, complete resection for malignant melanoma may assure a good prognosis.

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