Extraaxial chloroma of the cerebellopontine angle: case report.
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A chloroma or granulocytic sarcoma is an extramedullary leukemia. It can be encountered at any anatomical location, but until now only three cases have been reported in the cerebellopontine angle. We present an 8-year old patient with an extraaxial chloroma of the cerebellopontine angle to highlight this very rare and malignant pathology in the differential diagnosis of cerebellopontine angle tumors. The presented case, being the fourth chloroma in the cerebellopontine angle, occurred in the absence of relapse which is very unusual for these lesions. Chloroma should be remembered as a very rare and a malignant pathology in the differential diagnosis of pediatric cerebellopontine angle tumors. (+info)
Trigeminal neuralgia caused by intracranial epidermoid tumour: report of a case.
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Trigeminal neuralgia is a recognized complication in patients with intracranial tumours affecting the trigeminal nerve. This case report describes an epidermoid tumour at the cerebellopontine angle in a middle-aged man with otherwise classical unilateral trigeminal neuralgia. The case highlights the difficulties of diagnosis and the importance of a multidisciplinary approach when trigeminal neuralgia occurs concurrently with a brain tumour. (+info)
Vascular loops at the cerebellopontine angle: is there a correlation with tinnitus?
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An extremely rare case of a right cerebellopontine angle medulloblastoma in a five year old Malay girl which had eroded into the petrous bone and extended into the temporal fossa is reported. Combined subtemporal and retromastoid approach to achieve gross total surgical resection was achieved followed by radiotherapy and chemotherapy. (+info)
An endodermal sinus tumor in the cerebellopontine angle.
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Immunohistochemical and ultrastructural findings in a primary intracranial endodermal sinus tumor are reported in this paper. The tumor cells exhibited AFP, CEA and anti-alpha-1-trypsin positive immunoreactivity immunocytochemically. Aggregates of electron-dense material in the extra- and intracellular spaces and amorphous basement membrane-like substance were seen extracellularly by electron microscopy. The clinicopathological, immunocytochemical and ultrastructural features were consistent with the criteria for primary intracranial sinus tumor. (+info)
A large choroid plexus papilloma removed by the cerebellomedullary fissure approach. Case report and review of the literature.
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We report a case of large choroid plexus papilloma of the fourth ventricle in a 23-year-old woman. She presented with severe headache, dysphagia, and gait disturbances. Horizontal nystagmus, ataxic gait and quadriparesis were detected on initial examination. Imaging studies showed a large mass in the left side of brain stem and a marked hydrocephalus. The tumour was removed by microsurgical dissection of the cerebellomedullary fissure. We have discussed the effectiveness of this approach for removal of bulky tumors of the fourth ventricle and reviewed the literature about its benefits and potential hazards. (+info)
Retroclival arachnoid cyst with hemifacial spasm.
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Arachnoid cysts are rare lesions occurring anywhere in the cerebrospinal axis. The sylvian fissure remains the most favoured site for their occurrence, followed by cerebellopontine angle, suprasellar, and quadrigeminal cisterns. Retroclival arachnoid cysts are very rare. We report a retroclival arachnoid cyst with bilateral cerebellopontine angle extensions with hemifacial spasm in a 26-year-old woman. The patient underwent surgery and her hemifacial spasm improved. (+info)
Clinical and financial audit of diagnostic protocols for lesions of the cerebellopontine angle.
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OBJECTIVE: To assess the diagnostic efficiency and costs of protocols used for investigating patients with suspected lesions of the cerebellopontine angle. DESIGN: Prospective evaluation of tests of auditory brain stem responses and acoustic reflex thresholds, electronystagmography, and calorics. Positive test results were confirmed or refuted by high resolution computed tomography with intravenous enhancement. SETTING: Single general otolaryngology clinic in a teaching hospital. PATIENTS: 270 consecutive patients with sensorineural hearing loss requiring investigation to exclude a lesion of the cerebellopontine angle. MAIN OUTCOME MEASURES: Estimated costs of various diagnostic protocols and performance in detecting tumours of the cerebellopontine angle. RESULTS: Protocols including tests of auditory brain stem responses and acoustic reflex thresholds as sifting tests before computed tomography were clinically acceptable and presented considerable savings over the use of computed tomography in all patients (74,000 pounds or 84,000 pounds v 122,000 pounds). The use of electronystagmography and calorics could not be justified on clinical or financial grounds. CONCLUSIONS: Audiological tests of auditory brain stem responses and acoustic reflex thresholds followed by computed tomography constitute the most cost effective protocol for determining suspected lesions of the cerebellopontine angle. IMPLICATIONS: The cost effectiveness of diagnostic protocols should be evaluated throughout the health service. (+info)