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Background. Petroclival meningiomas are vaguely defined as tumours arising from the antero-medial zone to the internal auditory meatus. This report subclassifies petroclival meningiomas based on their origin determined by using radiological and intra-operative findings. Method. Ninety-one patients with petroclival meningioma underwent surgery via the(More)
¶Background. A variety of procedures for reconstructing the spine following the removal of spinal cord and cauda equina tumours have been developed to prevent postoperative spinal deformities and nerve entrapment. The purpose of this paper is to introduce a new reconstructive procedure based on rotational laminoplasty and to report preliminary results in a(More)
Both intraosseous and microcystic meningiomas are rare tumor types. We report the case of a 66-year-old woman with intraosseous microcystic meningioma without a mass lesion. She presented with a rare intraosseous microcystic meningioma manifesting as pain. Radiological examination revealed an osteolytic lesion in the right parietal bone. Magnetic resonance(More)
Schwannomas arising from the greater petrosal nerve (GPN) are exceedingly rare: only 10 such cases have been reported in the English literature. We report on four cases of GPN schwannomas and discuss the surgical approach for their removal. Four patients with GPN schwannomas underwent surgery at Keio University Hospital. We present the pre- and(More)
Hypoglossal schwannomas are very rare tumors that often enlarge the hypoglossal canal and jugular foramen, and erode the bone bridge of the occipital condyle. We compared pre- and postoperative 3D bone CT images and discussed the ideal craniotomy to prevent fracture formation. Seven patients with hypoglossal schwannomas underwent surgery in our department.(More)
The standard anterior transpetrosal approach (ATPA) for petroclival lesions is fundamentally an epidural approach and has been practiced for many decades quite successfully. However, this approach has some disadvantages, such as epidural venous bleeding around foramen ovale. We describe here our experience with a modified technique for anterior petrosectomy(More)
Cognitive function has not been well studied after neurosurgery for posterior fossa lesions despite its potential importance in determining surgical indications and approaches. The present study evaluated changes in cognitive functions after posterior fossa surgery to detect any differences between the middle cranial fossa and lateral suboccipital(More)
OBJECTIVE This study evaluated executive dysfunction in patients with subarachnoid haemorrhage (SAH) using the Behavioural Assessment of the Dysexecutive Syndrome (BADS) and correlated the occurrence of executive dysfunction with cerebral blood flow (CBF) reduction in the frontal lobe as assessed by single photon emission computed tomography (SPECT). (More)