Astrocytoma as one of the most common central nervous system (CNS) tumors is rarely reported in veterinary literature. A 7-year-old Persian Lori-Bakhtiari ewe was presented to the clinic with a two months history of progressive blindness, nystagmus to the right, bilaterally decreased pupillary reflexes, head pressing and paddling. At necropsy, a whitish well-circumscribed mass with dimensions o...

Glioneuronal neoplasms are rare tumors. Recently, an unusual glioneuronal tumor histologically showing neuropil-like islands has been described. Here, we present such a tumor originating from spinal cord of a 14-year-old girl, who has scoliosis and urinary incontinence. Microscopically, the glial component was chiefly fibrillary astrocytic, punctuated by neuropil-like islands. Immunohistochemic...

Glioblastoma multiforme is the most common intracranial neoplasm of all primary central nervous system tumors. Glial tumors can present in different forms. Intracranial hemorrhage may occur in all central nervous system tumors to a varying degree and extent and may even be massive. A 58-year-old man presented with intraparenchymal hemorrhage manifesting as severe headache and vomiting. Cranial ...

1. Carcinomatous meningitis (metastases caused by carcinoma such as lung and breast) 2. Meningeal gliomatosis (dissemination of CSF caused by malignant glial tumors) 3. Leptomeningeal metastases secondary to other underlying solid tumors (e.g., rhabdomyosarcoma, neuroblastoma, medulloblastoma, other primitive neuroectodermal tumors) 4. Lymphomatous meningitis (metastases caused by lymphoma) 5. ...

Desmosterol (24-dehydrocholesterol), a precursor of cho lesterol, represents 5 to 20% of the total sterols of the brain during maturation, although it is practically absent in normal adult brain. The desmosterol content is increased to a small extent in human glial tumors and in some transplantable experimental tumors. In the present experiments it has been shown that desmo sterol accumulates i...