Vestibular schwannoma cerebellopontine angle position impacts facial outcome. Study limitations included its retrospective nature and the limited number of patients included.ĬITATION: Hobson CE, Saliba J, Vorasubin N, et al. Findings suggest that PA ratio and anterior dimension could be considered with tumor size when predicting facial outcomes. Patients with poor facial function in early follow-up who recovered to good function long term had significantly larger PA ratios and smaller anterior dimensions than patients who did not recover. Although patients with good function had larger PA ratios than patients with poor function, early and long term, greatest dimension was the more significant independent predictor of facial outcomes. shift in the monkeys internal criteria by which it makes a re. Astrocytoma is the most common lesion to. Childhood neoplasms such as medulloblastoma, astrocytoma, and ependymoma may present in this fashion. Careful attention to all MR pulse sequences will usually reveal an infiltrative intra-axial component that clarifies the diagnosis. Ninety-two (72%) patients underwent gross total resection of their tumors. The outer ear canal was determined to be free of obstruction and infection. The internal auditory canals (IACs) are oriented perpendicular. Mazzoni A: Internal auditory canal: Arterial relations at the porus acusticus. Long term, 90 (71%) patients had good facial function 37 (29%) had poor function. Anterior inferior serebellar arter internal akustik kanaln ya ierisine. Short term, 76 (60%) patients had good facial function, and 51 (40%) had poor function. Tumor measurements included greatest dimension, dimension anterior to the IAC axis, dimension posterior to the IAC axis, and a ratio of posterior-to-anterior dimension (PA ratio). SYNOPSIS: Researchers reviewed the charts of 127 patients who underwent retrosigmoid (17%) and/or translabyrinthine (82%) resection of tumors, with a greatest tumor dimension of >25 mm, including both IAC and cerebellopontine angle components. SETTING: Department of Otolaryngology–Head and Neck Surgery, Southern California Permanente Medical Group, San Diego, Calif. STUDY DESIGN: Retrospective chart review. Facial paralysis risk following surgical resection in patients with VS has been correlated with tumor size, position, and growth direction. A large hemangioma may involve the petrous pyramid and extend into the. VS position relative to the IAC axis can be used along with tumor size to predict postoperative facial outcomes.īACKGROUND: Treatment of VS, a benign tumor commonly arising from the vestibular branch of the eighth cranial nerve, must balance hearing/facial function preservation with tumor removal or cessation of growth. signal void areas caused by calcifications.
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