Three had congenital progressive hearing loss, one of these had an accompanying large vestibular aqueduct and dysplasia of the cochlea. Three of these children are girls and two children were boys. The internal acoustic meatus (IAM) is a short bony canal that lies between the posterior surface of the petrous pyramid and the bony labyrinth within the dense. range of head and brain MRI scans to give a detailed view of all the structures within the brain, including blood vessels and the internal auditory canal. Acoustic neuromas are benign (not cancer) and usually grow slowly. Posterior division passes to the ampullary crest of the posterior semicircular. These tumors grow from the sheath covering the vestibulocochlear nerve. The fibers are distributed as follows: a. The internal auditory meatus, the endolymphatic foramen and the subarcuate fossa are obvious and the internal carotid artery and the VIIth (facial) cranial. Casts of the specimens were prepared and the meatuses were measured in different planes. The authors studied the cadaveric heads of 22 adults to describe the internal acoustic meatus (IAM) and its contents. Part of the material was also examined by multidirectional and computed tomography. On the more distal side of the vestibular ganglion the nerve divides into a posterior, superior, and inferior branch. The internal acoustic meatus was evaluated in 97 temporal bone specimens, half of which were radiographed in different projections. We report five cases of children with LIAM and profound hearing loss. The vestibular ganglion is found in the trunk of the nerve at, or within, the internal auditory meatus. Computed tomography (CT) scans show the otic capsule to be affected by a widened, bulbar internal auditory meatus with loss of or reduction of the bony wall dividing the lateral fundus of the meatus from the cochlea. Two patients had had meningitis resulting in profound loss.ĪB - This paper describes the abnormality of a large internal auditory meatus (LIAM).
Three of these children are girls and two children were boys. We report five cases of children with LIAM and profound hearing loss. It is associated with congenital sensorineural hearing loss. Computed tomography (CT) scans show the otic capsule to be affected by a widened, bulbar internal auditory meatus with loss of or reduction of the bony wall dividing the lateral fundus of the meatus from the cochlea. A narrow internal auditory canal (IAC) with duplication is a rare anomaly of the temporal bone. N2 - This paper describes the abnormality of a large internal auditory meatus (LIAM). The internal acoustic meatus (also internal auditory meatus) is a canal in the temporal bone of the skull that carries nerves from inside the cranium. T1 - Hearing loss associated with large internal auditory meatus