[Melanotic schwannoma with a high level of catecholamine in an elderly patient].

A 73-year-old woman suffering from hypertension and asthma had chest radiography, which showed the shadow of a lump on the inner side of the right lung apex. From a chest CT scan, it was diagnosed as an upper mediastinal tumor (circular in shape with a diameter of 19 x 23 mm) adjacent to the right rib and showing a low-absorption range. Histopathology confirmed the diagnosis as an Antoni B-type melanotic schwannoma.