Large oculomotor nerve schwannoma - Rare entity: A case report with review of literature

Abstract

Schwannomas commonly arise from peripheral nerves. Intracranial schwannomas are comparatively rare and are seen commonly as vestibular tumors. Oculomotor nerve schwannomas are extremely rare tumors, these are usually symptomatic. A 29 year aged male presented with diplopia and blurring of vision in left eye and found to have an extra-axial lesion at left cavernous sinus involving oculomotor nerve. The excised tumor showed classic morphology of a schwannoma. Postoperatively patient developed complete oculomotor nerve palsy. The tumor recurred after 2 years. It was re-excised followed by radiotherapy.

Ice Pack Test Eased Ptosis in a Patient Presenting with a Possible Oculomotor Nerve Schwannoma: A Case Report

“…Due to the localization and morphology of the lesion and other radiological characteristics, our neuroradiologists supposed a schwannoma of the left third cranial nerve ( Figure 2 a–c). It is true that schwannomas reported in the literature are often larger and heterogeneously hyperintense on T2-weighted sequences; however, schwannomas’ appearance at MRI is variable because of the possibility of different histologic patterns [ 5 , 6 , 7 , 8 , 9 ]. Unfortunately, due to the lesion’s small size and localization, our neurosurgeons did not perform stereotactic biopsy; therefore, no tissue for histologic analysis was available.…”

A Sporadic Cisternal Cystic Oculomotor Schwannoma—Case Report and Review of Literature

“…Most commonly, they involve the vestibular and trigeminal nerves, followed by the lower cranial nerves. 1 There are many case reports of oculomotor schwannomas; however, purely cystic oculomotor schwannomas are mentioned only in three case reports. 2 …”

“…Most commonly, they involve the vestibular and trigeminal nerves, followed by the lower cranial nerves. 1 There are many case reports of oculomotor schwannomas; however, purely cystic oculomotor schwannomas are mentioned only in three case reports. 2 Oculomotor schwannomas are commonly associated with neurofibromatosis, but sporadic cisternal purely cystic oculomotor schwannoma is still a rarely reported entity.…”

Cisternal oculomotor schwannoma: a rare cause of anisocoria with ptosis in a child

“…The first case of oculomotor nerve schwannoma was reported by Kovacs in an autopsy in 1927. Thereafter, around 40 cases of oculomotor nerve schwannomas have been described [5][6][7][8]. Pediatric intracranial schwannoma originating from the oculomotor nerve is rarely described, and only 12 such cases without coexisting neurofibromatosis in children under 18 years of age have been reported [9][10][11].…”