Sporadic unilateral vestibular schwannoma with islets of meningioma: Case report

OBJECTIVE AND IMPORTANCE: Vestibular schwannomas with meningioma islets hav e been rarely reported in the literature; they have been observed only amon g patients with neurofibromatosis Type II. We present a case of a sporadic mixed tumor in a patient without neurofibromatosis Type II that was not sus pected before surgery. CLINICAL PRESENTATION: A 59-year-old female patient presented with clinical signs of progressive loss of hearing. Her family history did not include e vidence of neurological diseases. Magnetic resonance imaging scans revealed a typical unilateral vestibular schwannoma. INTERVENTION: The tumor presented with invasion of the surrounding arachnoi d membrane, as well as Cranial Nerves VII and VIII. Preservation of the fac ial nerve with complete removal of the tumor was not possible. Therefore, C ranial Nerve VII reconstruction was performed. CONCLUSION: The concomitant occurrence of schwannomas and meningiomas infil trating the arachnoid membrane might be related to poor clinical outcomes f or patients with neurofibromatosis Type II, with respect to preservation of facial and acoustic nerves. Among sporadic schwannomas, this phenomenon is extremely rare.