What is difference between ethmoidal meningocele and ethmoidal meningoencephalocele?
A). Ethmoidal meningocele is defined as protrusion of meninges with cerebrospinal fluid (CSF) through a cranial defect into the ethmoidal air cells. B). Ethmoidal meningoencephalocele is defined as herniation of brain tissue, meninges with CSF through a cranial defect into the ethmoidal air cells.
A well-defined T1 hypointense and T2 hyperintense lesion is seen at the left anterior ethmoidal air cells, measuring 12 x 12 x 16 mm (AP x W x CC). The lesion shows almost total signal suppression on the FLAIR sequence. No definite enhancement. There is communication with floor of the left anterior cranial fossa with its neck measuring 4.3mm. Small focal defect seen at the inferior aspect of this lesion, which appears communicating with left medial meatus. Presence of cerebrospinal fluid within the left-sided ethmoidal sinus. No evidence of encephalocele. No intraorbital extension.
Minimal mucosal thickening is noted at both agger nasi and bilateral maxillary sinuses. Fluid intensity is seen at the left maxillary sinus.
Bilateral osteo-meatal complexes are preserved. Minimal nasal septum deviation to the left.
Left inferior nasal turbinate hypertrophy. No concha bullosa.
Small non-specific T2/ FLAIR hyperintense focus is observed at deep white matter of left centrum semiovale. The rest of brain parenchyma is normal.