An experience of operative case of basal (transethmoidal type) @entity55770 is reported. A 3-year-old @entity1 complained of continuous, spontaneous @entity5254 and right intranasal @entity66 . The @entity5254 began when one year old. He suffered from @entity693 at the age of two. When he was three years old, the intranasal mass and CSF @entity5254 were perceived. On admission he had normal general status and no abnormality in neurological examination. The usual axial computed tomography showed a small mass in the intranasal cavity. But the continuity between the mass and brain parenchyma was not detected in this study. @entity6161 CT cisternography demonstrated it. Coronal CT scan visualized it more directly. We performed operation using bifrontal craniotomy and subfrontal approach. Brain parenchyma did not protrude into the frontal cranial base and expanding right olfactory nerve penetrated into the small defect at the right cribriform plate. The olfactory nerve was extracted as much as possible. The defect was filled with a few piece of muscle and coating with the adhesive agent was performed. Histological findings of operative specimen were abnormal olfactory nerve, normal brain tissue and arachnoid membrane. Post-operative state was uneventful. CSF @entity5254 disappeared. Post-operative direct sagittal computed tomography visualized the @entity55770 extremely. Biopsy of the intranasal mass revealed brain tissue covered by normal nasal epithelium. Basal encephalocele is rare in Japan. We found 10 cases in the literature. It is important that we do not forget basal encephalocele in the difference of intranasal @entity5 .(ABSTRACT TRUNCATED AT 250 WORDS)

[A case of basal XXXX (a transethmoidal type) containing the olfactory nerve].

@entity1 :: ('9606', 'Species') :: ['boy'] @entity66 :: ('MESH:D004194', 'Disease') :: ['mass lesion'] @entity55770 :: ('MESH:C567055', 'Disease') :: ['encephalomeningocele'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumors'] @entity6161 :: ('MESH:D008793', 'Chemical') :: ['Metrizamide'] @entity693 :: ('MESH:D008581', 'Disease') :: ['meningitis'] @entity5254 :: ('MESH:D002559', 'Disease') :: ['rhinorrhea', 'cerebrospinal fluid rhinorrhea']
@entity55770 :: (MESH:C567055,Disease) :: ['encephalomeningocele']
