Abstract
A case of benign localized pleural mesothelioma which was found in the visceral pleura between left upper and lower lobe is reported. A 39-year-old man was pointed out an abnormal lung shadow in the chest X-ray film two years ago. He was referred to our ward for a recent enlargement of the shadow. A plain chest film revealed a homogenous shadow with positive extrapleural sign in the left superior mediastinum. The shadow had enlarged and moved downward by about 3cm during two years. Right anterior oblique projection showed a wrighting brush-like shadow toward the hilus which suggested an interlobar disease, but chest CT scan suggested a mediastinal tomor. Since it was difficult to make an established diagnosis preoperatively, thoracotomy was prformed. There was a pedunculated mass in the visceral pleura between left upper and lower lobe, and the mass was removed with normal lung tissue. Histological examination could confirm that it was a benign localized fibrous mesothelioma.
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