AbstractA case of galactorrhea induced by hyperprolactinemia has been reported. This patient had bronchogenic carcinoma, undifferentiated, spindle‐cell‐type, and underwent a pneumonectomy followed by postoperative irradiation of the mediastinum. The initial surgical resection, followed by irradiation, returned the abnormal levels of prolactin secretion to normal. Although subsequent determinations could not be made, this case supports evidence from earlier reports that galactorrhea‐induced hyperprolactinemia may occur concomitantly as a paraneoplastic syndrome with this rare form of carc