Medial Acoustic Neuromas: A New Clinical Entity

Medial acoustic neuromas: clinical and surgical implications

“…9,31,34 In our series, 87% of patients who had Grade I-II facial function prior to surgery continued to have Grade I-II function at follow-up, consistent with other authors' success of achieving approximately 80% Grade I-II facial nerve function in patients with large tumors (> 3 cm). 2 The rate of permanent complete facial paralysis in patients with intact preopera- tive facial function and long-term follow-up was approximately 2%.…”

The facial nerve in medial acoustic neuromas

“…As did Tos, et al, 16 Inamasu and coworkers attributed the unfavorable results in seventh and eighth cranial nerve function in medial acoustic neuromas to the larger tumor size at the time of diagnosis compared with sizes of nonmedial tumors.…”

“…Tumor size at diagnosis is significantly larger compared with nonmedial tumors, and 91.7% of tumors were either large (26-40 mm in diameter on axial imaging) or giant (Ͼ 40 mm). 16 Preoperative facial nerve function is impaired in 10%, and facial nerve function as well as the degree of hearing loss in the series published by Tos, et al, did not significantly vary compared with nonmedial tumors. The facial nerve outcome is comparable with nonmedial tumors when taking lesion size into consideration.…”

Does Intracanalicular Involvement Affect Presentation and Outcomes in Vestibular Schwannoma?

“…The symptomatology at presentation between the two groups was similar, despite prior reports of the medial VS subtype reporting a higher frequency of facial numbness. 13,14 Investigating the outcomes of their surgery further, there was no significant difference in the extent of resection. There was notably a trend toward significance regarding length of stay with the medial VS patients tending to stay longer, but the reasoning behind and implications of this finding could not be easily determined in this retrospective study.…”

“…Recently, there has been an increasing emphasis on the interplay between specific tumor anatomy and the orientation of tumor bulk with these outcomes as well, identifying nuance within this well-established doctrine. [13][14][15][16][17] The identification of a potential subtype of VS, termed "medial" VS, has specifically been associated with worse outcomes. 13,14 Motivated by these studies, the present work sought to evaluate the influence of intracanalicular tumor involvement on postsurgical outcomes.…”