originating from the pericytes of Zimmermann that are normally present in the basal membrane of the capillaries and postcapillary venules. The function of the pericytes is not well understood, although they appear to be involved in the regulation of vessel caliber. As all capillaries are enveloped by pericytes, hemangiopericytomas can be found virtually anywhere in the body (1, 2). However, thi...

Glomangiopericytoma/sinonasal type hemangiopericytoma is a rare sinonasal neoplasm arising from the pericytes surrounding capillaries and accounts for less than 0.5% of all sinonasal tumors. This tumor differs from conventional soft tissue hemangiopericytoma in location, biologic behaviour and histologic features. Glomangiopericytoma is a borderline low malignancy tumor with a good prognosis af...

Intracranial hemangiopericytoma is a rare CNS tumor that exhibits a high incidence of local recurrence and remote metastasis. Radiosurgery has emerged as an alternative approach to microsurgery. Retrospective analyses of outcomes following stereotactic radiosurgery for hemangiopericytoma have been published. The case numbers in each series are usually less than 30 patients. The precise indicati...

Thallium-201 (201Tl) scintigraphy is one of the imaging methods used in the detection of various tumors including brain metastasis. We evaluated a patient with meningeal carcinomatosis from breast cancer by using 201Tl single-photon emission computed tomography (SPECT). Meningeal spread of a tumor was noted on enhanced CT. SPECT revealed tumor localization in meningeal carcinomatosis. These res...

Introduction Cortical spreading depression (CSD) is believed to promote migraine headache by enhancing the activity and mechanosensitivity of trigeminal intracranial meningeal afferents. One putative mechanism underlying this afferent response involves an acute excitation of meningeal afferents by cortical efflux of K+ and the ensuing antidromic release of proinflammatory sensory neuropeptides,...