MyMedR

Fulltext A rare case of bleeding in a cerebellopontine angle epidermoid cyst

Zamzuri I, Abdullah J, Madhavan M, Ariff AR

Med J Malaysia, 2002 Mar;57(1):114-7.

Epidermoid cysts of the central nervous system are described as rare, benign, slow growing lesions with a history of high rate of recurrence even after surgical removal. This lesion is rarely located at the cerebellopontine angle and is found to be composed of solid and cystic components with close adherence to vital neurovascular structures that might complicate its removal. We present a rare case of a twenty-five year old housewife with signs and symptoms of increased intracranial pressure due to the above pathology after multiple episodes of intra-tumoral bleeding. Microneurosurgical techniques were used for tumour dissection and excision. The patient recovered well after a three-year follow-up. This is the fourth example in the index medicus of bleeding seen in a histopathologically proven cerebellopontine angle intraepidermoid cyst.

Matched MeSH terms: Cerebellopontine Angle/pathology*; Cerebellopontine Angle/surgery

Fulltext An unexpected lesion in cerebellopontine angle: hemangiopericytoma

Teoh JW, Goh BS, Shahizon Azura MM, Siti Aishah MA, Nor Hafliza MS

Med J Malaysia, 2014 Jun;69(3):146-7.

PMID: 25326360 MyJurnal

hemangiopericytoma (hPC) is a rare tumor by definition and intracranial hPC makes up to less than one percent of all the intracranial tumors. It is a dural base tumor and its clinical features and radiological findings are similar to meningiomas. however, cerebellopontine angle hemangipericytoma had only been reported twice and would almost always be misdiagnosed. definite diagnosis is important, as the treatment of hPC is different from meningiomas and acoustic neuromas. we report a case of a young female who presented with atypical symptoms of left cerebellopontine angle mass. A literature review of the nature of the disease, radiological findings, immunohistochemical features and treatment options of the tumor are described.

Matched MeSH terms: Cerebellopontine Angle

Recurrence of a nasopharyngeal carcinoma manifesting as a cerebellopontine angle mass

Kong MH, Jeevanan J, Jegan T

Ear Nose Throat J, 2013 Dec;92(12):E11-3.

PMID: 24366707

As many as 31% of patients with nasopharyngeal carcinoma present with intracranial extension. Despite this high percentage, extension to the cerebellopontine angle is rare. The mechanism of tumor spread to the cerebellopontine angle is not completely understood. The most likely mechanism is direct extension to the skull base with involvement of the petrous apex and further extension posteriorly via the medial tentorial edge. We report the case of a 46-year-old woman with nasopharyngeal carcinoma who had been treated initially with chemoradiation and subsequently with stereotactic radiosurgery for residual tumor. One year later, she presented with an intracranial recurrence of the nasopharyngeal carcinoma in the cerebellopontine angle; the recurrence mimicked a benign tumor on magnetic resonance imaging. The tumor was ultimately diagnosed as an undifferentiated carcinoma of nasopharyngeal origin. She was treated with palliative chemotherapy.

Matched MeSH terms: Cerebellopontine Angle*

Fulltext Cerebellopontine angle medulloblastoma

Nyanaveelan M, Azmi A, Saffari M, Banu SK, Suryati MY, Jeyaledchumy M

Med J Malaysia, 2007 Jun;62(2):173-4.

PMID: 18705459 MyJurnal

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.

Matched MeSH terms: Cerebellopontine Angle*

Vascular loop in the cerebellopontine angle causing pulsatile tinnitus and headache: a case report

Ramly NA, Roslenda AR, Suraya A, Asma A

EXCLI J, 2014;13:192-6.

PMID: 26417253

Tinnitus is a common disorder, it can be classified as pulsatile and non-pulsatile or objective and subjective. Pulsatile tinnitus is less common than non-pulsatile and can be due to vascular tumour such as glomus or vascular abnormality. We presented an interesting case of a 30 year-old Malay lady with a two-year history of pulsatile tinnitus which was worsening in three months duration. It was associated with intermittent headache. Clinical examination and tuning fork test were unremarkable. Apart from mild hearing loss at high frequency on the left ear, the pure tone audiogram (PTA) was otherwise normal. In view of the patient's young age with no risk factor for high frequency loss, a magnetic resonance imaging (MRI) was performed to look for any abnormality in the cerebellopontine angle. It revealed a single vessel looping around the left vestibulocochlear and facial nerves at the cisternal portion, likely a branch of the anteroinferior cerebellar artery (AICA). Literature review on the pathophysiology and treatment option in this condition is discussed.

Matched MeSH terms: Cerebellopontine Angle

Fulltext A rare case of paediatric pontine glioblastoma presenting as a cerebellopontine angle otogenic abscess

Rasalingam K, Abdullah JM, Idris Z, Pal HK, Wahab N, Omar E, et al.

Malays J Med Sci, 2008 Jan;15(1):44-8.

PMID: 22589615

We describe rare case of a 9-year old boy who presented with a two-week history of right ear discharge and mild fever. Contrast enhanced CT scan of the brain showed a lesion in the right cerebellopontine angle with mild enhancement mimicking early abscess formation. Involvement of the mastoid air cells pointing towards a radiological diagnosis of mastoiditis reinforced the diagnosis of an abscess. A magnetic resonance imaging (MRI) was planned for the patient but his conscious level deteriorated and patient slipped into coma warranting immediate surgical intervention. Intraoperatively, about 90% of the tumour was removed and the appearance of the tumour resembled that of an acoustic schwannoma but histopathology confirmed the diagnosis of a glioblastoma multiforme (GBM). MRI done post operatively showed lesion in the pons confirming the diagnosis of an exophytic pontine glioblastoma multiforme.

Matched MeSH terms: Cerebellopontine Angle

Fulltext Acoustic neuroma with orofacial paresthesia: description of an atypical presentation

Lim CC, Misron K, Liew YT, Wong EHC

BMJ Case Rep, 2019 Nov 04;12(11).

PMID: 31690691 DOI: 10.1136/bcr-2019-232275

Acoustic neuroma (AN) usually manifests with asymmetric hearing loss, tinnitus, dizziness and sense of disequilibrium. About 10% of patients complain of atypical symptoms, which include facial numbness or pain and sudden onset of hearing loss. Patients with atypical symptoms also tend to have larger tumours due to the delay in investigation. We report a particularly interesting case of a patient presented to us with numbness over her right hemifacial region after a dental procedure without significant acoustic and vestibular symptoms. Physical examination and pure tone audiometry revealed no significant findings but further imaging revealed a cerebellopontine angle mass. The changing trends with easier access to further imaging indicate that the presentation of patients with AN are also changing. Atypical symptoms which are persistent should raise clinical suspicion of this pathology among clinicians.

Matched MeSH terms: Cerebellopontine Angle/pathology*

Fulltext Can bone wax cause cholesterol granuloma in the petrous apex? A case report

Wong EHC, Lim CC, Ong CA, Narayanan P

Int J Surg Case Rep, 2020;72:587-589.

PMID: 32698294 DOI: 10.1016/j.ijscr.2020.06.086

BACKGROUND: Cholesterol granuloma (CG) is a rare entity but is the commonest lesion in the petrous apex. They are associated with chronic ear disease and previous temporal bone surgery. While bone wax has been known to cause foreign body reaction due to its non-resorbable property in the mastoid, it has not been documented to cause CG formation.

CASE PRESENTATION: We described a 43 years old male who presented with a right mastoid swelling, nine years after a right retro-sigmoid craniotomy and excision for a cerebellopontine angle meningioma. He also had multiple cranial neuropathies involving trigeminal, facial and vestibulocochlear nerves. Temporal bone CT and MRI showed features suggestive of cholesterol granuloma with extensive bony erosions. He was treated with surgical excision and drainage where bone wax residues were found intraoperatively. Histopathological analysis of the lesion confirmed the diagnosis of cholesterol granuloma. Post-operatively, the mastoid swelling resolved and his recovery was uneventful.

CONCLUSION: Our case showed that CG could manifest as a complication of bone wax usage in a neurosurgical procedure. Even though further study is needed to draw a definitive conclusion on this theory, we believe this paper will contribute to the current literature as it is the only reported case of cholesterol granuloma with bone wax as the possible causative agent. This is important so that surgeons are aware of this potential complication and use this haemostatic agent more judiciously.

Matched MeSH terms: Cerebellopontine Angle

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