Bilateral Subdural Hematoma Associated with Central Nervous System Metastases from Lung Cancer

A 74-year-old man was referred to our hospital because of a gait disturbance. Positron emission tomography and computed tomography scans revealed a tumor in his left lower lobe, but no other lesions were found. Multiple brain tumors compatible with metastatic tumors were found with magnetic resonance imaging of the brain (Figure 1A). A histologic examination via transbronchial biopsy revealed adenocarcinoma, and the patient was diagnosed with metastatic non-small cell lung cancer. Epidermal growth factor receptor gene mutational analysis revealed that the cancer was of the wild type. After whole-brain radiotherapy, six cycles of chemotherapy consisting of cisplatin and gemcitabine were administered. The primary lung tumor remained as