Abstract
The patient was a 9-year-old boy. He visited a local otolaryngologist with a right intranasal tumor as the chief complaint and a biopsy was performed. Since watery nasal discharge continued thereafter, he was first examined in our department on August 7, 1993. In a CT scan, a bone defect in the right cribrifom plate of the ethmoid bone and an associated isodensity lesion occupied the nasal meatus. In MRI, a long T1 lesion with a clear margin was obtained at the same site. Based on a diagnosis of meningoencephalocele, radical operation by frontal craniotomy was performed on August 24, 1993.
No cerebral parenchyma or blood vessels were found in the arachnoid membrane which has protruded into the nasal cavity. The postoperative course has been good to date except for a right olfactory disorder.
