1/27. Pontine cryptococcoma in a nonimmunocompromised individual: MRI characteristics.The case of a pontine cryptococcoma in a nonimmunocompromised, previously healthy 16-year-old boy is presented. The patient had slowly progressive brainstem signs with right cranial nerves V, VII, and VIII palsies, and contralateral corticospinal and spinothalamic deficits. Magnetic resonance images (MRI) revealed, within the right pons, a 1-cm diameter round mass lesion, hypointense on T1-weighted images, hyperintense on T2-weighted images, and with rim enhancement after infusion of gadopentetate dimeglumine. This is the only report of the MRI findings in an isolated pontine cryptococcoma in an immunocompetent patient. Early recognition of this specific MRI pattern is essential, because complete recovery can be achieved with prompt antifungal treatment.- - - - - - - - - - ranking = 1keywords = spinal (Clic here for more details about this article) |
2/27. Magnetic resonance cisternography using the fast spin echo method for the evaluation of vestibular schwannoma.neuroimaging of vestibular schwannoma was performed with the fat-suppression spoiled gradient recalled acquisition in the steady state (SPGR) method and magnetic resonance (MR) cisternography, which is a fast spin echo method using a long echo train length, for the preoperative evaluation of the lateral extension of the tumor in the internal auditory canal, and the anatomical identification of the posterior semicircular canal and the nerves in the canal distal to the tumor. The SPGR method overestimated the lateral extension in eight cases, probably because of enhancement of the nerves adjacent to the tumor in the canal. The posterior semicircular canal could not be clearly identified, and the cranial nerves in the canal were shown only as a nerve bundle. In contrast, MR cisternography showed clear images of the lateral extension of the tumor and the facial and cochlear nerves adjacent to the tumor in the internal auditory canal. The anatomical location of the posterior semicircular canal was also clearly shown. These preoperative findings are very useful to plan the extent to which the internal auditory canal can be opened, and for intraoperative identification of the nerves in the canal. MR cisternography is less invasive since no contrast material or radiation is required, as with thin-slice high-resolution computed tomography (CT). MR cisternography should replace high-resolution CT for the preoperative neuroradiological evaluation of vestibular schwannoma.- - - - - - - - - - ranking = 2386.9727454945keywords = canal (Clic here for more details about this article) |
3/27. Intracanalicular meningioma.Intracanalicular meningiomas are extremely rare and difficult to differentiate from intracanalicular vestibular schwannomas. We report an unusual case of a posterior fossa meningioma in the proximal internal auditory canal that was originally diagnosed as a vestibular schwannoma due to its appearance on magnetic resonance imaging. However, closer inspection of the preoperative neuroimages revealed features inconsistent with vestibular schwannoma that suggested the possibility of other less common lesions.- - - - - - - - - - ranking = 1670.8809218462keywords = canal (Clic here for more details about this article) |
4/27. Narrow internal auditory canal syndrome: parasaggital reconstruction.Narrow internal auditory canal (IAC) syndrome is a malformation of the temporal bone, that is defined as an IAC diameter of only 1-2 mm on high-resolution computed tomographic scans (HRCT). This syndrome is known to be caused by the absence (aplasia or hypoplasia) of the vestibulocochlear nerve. We present a case of unilateral narrow IAC syndrome which was diagnosed by HRCT. The aplasia of the vestibulocochlear nerve was confirmed using parasigittal reconstruction magnetic resonance image (MRI). The IAC was composed of two separate canals, one of which contained a facial nerve and the other was empty with aplasia of the vestibulocochlear nerve.- - - - - - - - - - ranking = 1432.1836472967keywords = canal (Clic here for more details about this article) |
5/27. Enhancement of the eighth cranial nerve and labyrinth on MR imaging in sudden sensorineural hearing loss associated with human herpesvirus 1 infection: case report.The case of a 61-year-old woman who presented with herpes labialis, subclinical meningitis, and sudden onset of bilateral sensorineural hearing loss is presented. Contrast-enhanced MR imaging showed marked bilateral enhancement of the intracanalicular portion of the eighth cranial nerve, right cochlea, and left vestibule. polymerase chain reaction was positive for human herpesvirus 1 obtained from the cerebral spinal fluid, which suggested the diagnosis of viral neuritis.- - - - - - - - - - ranking = 239.69727454945keywords = canal, spinal (Clic here for more details about this article) |
6/27. Malignant melanoma presenting as sudden onset of complete hearing loss.The authors describe a rare case of rapidly progressive bilateral hearing loss associated with carcinomatous meningitis secondary to a primary malignant melanoma of the lower limb 6 years previously. Carcinomatous meningitis is a relatively rare diagnosis, with the involvement of the eighth cranial nerve being present in only a small proportion of patients. diagnosis relies on clinical suspicion (when multiple cranial nerve lesions occur), magnetic resonance imaging, and cerebrospinal fluid cytology.- - - - - - - - - - ranking = 1keywords = spinal (Clic here for more details about this article) |
7/27. A case of multiple schwannomas of the trigeminal nerves, acoustic nerves, lower cranial nerves, brachial plexuses and spinal canal: schwannomatosis or neurofibromatosis?In most cases, while schwannoma is sporadically manifested as a single benign neoplasm, the presence of multiple schwannomas in one patient is usually indicative of neurofibromatosis 2. However, several recent reports have suggested that schwannomatosis itself may also be a distinct clinical entity. This study examines an extremely rare case of probable schwannomatosis associated with intracranial, intraspinal and peripheral involvements. A 63-year-old woman presented with a seven-year history of palpable lumps on both sides of the supraclavicular area and hearing impairment in both ears. On physical examination, no skin manifestations were evident. Facial sensory change, deafness in the left ear and decreased gag reflex were revealed by neurological examination. magnetic resonance imaging revealed multiple lesions of the trigeminal nerves, acoustic nerves, lower cranial nerves, spinal accessory nerve, brachial plexuses, and spinal nerves. Pathological examination of tumors from the bilateral brachial plexuses, the spinal nerve in the T8 spinal position and the neck mass revealed benign schwannomas. Following is this patient case report of multiple schwannomas presenting with no skin manifestations of neurofibromatosis.- - - - - - - - - - ranking = 963.78909819782keywords = canal, spinal (Clic here for more details about this article) |
8/27. osteoma of the internal auditory canal.Osteomas of the internal auditory canal, inaccesible to clinical examination, are rare lesions. There are only 14 cases of osteomas and exostoses of the internal auditory canal reported in the international medical literature. A patient with an osteoma of the internal auditory canal is presented, along with differential diagnosis and possible etiologic factors for the lesion. The auditory brainsteam evoked response testing showed increased absolute latencies of 1 wave and discrepancy of the wave morphology due to bony compression of the eight nerve in the internal auditory canal. Computed tomography showed a bony growth in the internal auditory canal. Magnetic response showed no abnormalities. No surgery was performed since the symptoms improved by conservative therapy.- - - - - - - - - - ranking = 2148.2754709451keywords = canal (Clic here for more details about this article) |
9/27. Vestibular-evoked myogenic potentials in two patients with Ramsay Hunt syndrome.We report on the function of the inferior vestibular nerve, as monitored by the vestibular-evoked myogenic potentials (VEMP), in two patients suffering from Ramsay Hunt syndrome. Both the patients presented canal paresis (CP) and hearing loss, but in one patient normal VEMP was recorded while the other presented vagus nerve paralysis plus no VEMP response at the highest stimulus intensity used in our institute (i.e., 105 dB nHL).- - - - - - - - - - ranking = 238.69727454945keywords = canal (Clic here for more details about this article) |
10/27. Epithelioid schwannoma of the vestibular nerve.Epithelioid schwannomas are rarely encountered intracranially, with only four cases involving the eighth nerve reported in the literature. Histological behaviour ranging from benign to aggressive has been described. We report a 45-year-old woman who presented with right-sided tinnitus and hearing impairment. magnetic resonance imaging revealed a tumour in the right cerebellopontine angle with intracanalicular extension. The patient underwent retromastoid craniectomy with near-total tumour excision. Microscopical examination confirmed the diagnosis of epithelioid schwannoma of the vestibular nerve. Intraoperative findings of sharp circumscription, bland histological appearance, low proliferative activity, coupled with the indolent clinical course, point to the quiescent nature of the lesion in this case.- - - - - - - - - - ranking = 238.69727454945keywords = canal (Clic here for more details about this article) |
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