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A 56-year-old male was admitted with the complaints of nasal bleeding, gait disturbance, and disturbance of consciousness. Neurological examination revealed drowsiness, right hemiparesis, and choked discs. Computed tomography scan showed an enhanced mass at the frontal base, which extended to the left nasal and paranasal cavities. Angiography showed a tumor stain with a mass sign. The intracranial part of the tumor was removed completely and he was discharged ambulatorily. Two months after surgery, however, he was admitted again for the regrowth of the tumor. Ventriculoperitoneal shunting was placed and radiation therapy was given to the brain and nasal cavity. After 3000 rad irradiation the clinical condition suddenly became worse because of pneumocephalus. The cranial tumor disappeared after irradiation but he died of metastases and general prostration. Clinically this case was diagnosed as an olfactory groove meningioma at first, but immunohistochemical diagnosis was olfactory neuroblastoma.

Olfactory Neuroblastoma complicated by Postirradiation Pneumocephalus