![]() Facial numbness, tingling, weakness or paralysisĪt Michigan Medicine, each patient is thoroughly evaluated, with a complete history, a physical examination, MRI or CT imaging and hearing and balance tests.Other symptoms, which can be mild or severe, may include: The most common symptoms of acoustic neuroma are hearing loss and tinnitus. Advances in hearing preservation with surgical intervention is a particular focus of clinical research at the University of Michigan. Preservation of hearing is more difficult but may also be possible in select centers with very experienced treatment teams. When an acoustic neuroma is caught early, the likelihood that an experienced surgeon can remove it while preserving the delicate facial nerve is quite good (greater than 90 percent). These patients are often diagnosed with tumors affecting both ears by the age of 30.Īcoustic neuromas are diagnosed with a detailed MRI and CT scan of the head if the patient presents with a decrease in hearing, tinnitus (ringing in the ear), dizziness or other common symptoms. NF2, the genetic variant, is a rare cause of these tumors accounting for only 5 percent of acoustic neuromas. Each year approximately 2,500-3,000 individuals in the United States are diagnosed with this tumor, which typically affects only one ear. Sporadic acoustic neuromas are the most common type. NF2 is a genetic, inherited disorder characterized by the growth of noncancerous tumors in the nervous system. There are two types of acoustic neuromas: a sporadic type and a type associated with a syndrome called neurofibromatosis type II (NF2). Acoustic neuromas can also be life threatening if they become large enough to compress the brain stem or cerebellum. Although these tumors do not invade the brain, they commonly cause hearing loss and can result in neurological deficits. This nerve, called the vestibulocochlear nerve, is involved in transmitting sound and sending balance information from the inner ear to the brain.Īcoustic neuromas are typically slow growing over a period of years. Some reports suggested that hemodynamic stress caused by AVM, hemangioblastoma, or vascular anastomosis could be a mechanism for the development of distal AICA aneurysm 8).An acoustic neuroma (also known as a vestibular schwannoma) is a benign tumor that originates on the eighth cranial nerve, which connects the inner ear with the brain. The pathological nature of this aneurysm is also unclear 3). Interestingly, most of the reported cases, including the current case, occurred in women without any known explanation. This group of aneurysms has certain features : 1) SAH occurs in most cases because of aneurysm rupture 2) tight adhesion to the surrounding structures including the nerve complex and 3) postoperative hearing function is likely to be seriously impaired 9). Total intrameatal aneurysms are type III meatal aneurysms and are extremely rare only 17 cases have been reported in the literature as of 2012 3). Meatal aneurysms are subdivided into 3 types according to Yamakawa's classification system : type I (remote type : aneurysm away from the meatus, 56%), type II (plugged : aneurysm partially buried in the meatus, 30%), and type III (buried : entirely buried in the meatus, 14%). 1) classified this aneurysm into 3 types : proximal, meatal, and distal. 4) reported that among 3500 surgically treated aneurysms, only 1.7% arose from the AICA. After operation the patient experienced transient facial paresis and tinnitus but improved during follow up.ĪICA aneurysms are very rare. The aneurysm was identified between the seventh and eighth cranial nerve in the meatus and was removed from the canal and clipped with a small straight Sugita clip. Surgery was performed by retrosigmoid craniotomy with unroofing of the internal auditory meatus. ![]() Computed tomography and digital subtraction angiography showed subarachnoid hemorrhage at the basal, prepontine cistern and an aneurysm of the distal anterior inferior cerebellar artery inside the internal auditory meatus. A 62-year-old female patient presenting with sudden bursting headache and neck pain was transferred to our department. The authors report a case of surgically treated total intrameatal AICA aneurysm. Among the distal anterior inferior cerebellar artery (AICA) aneurysms, a unique aneurysm at the meatal loop inside the internal auditory meatus is extremely rare. ![]()
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