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Approximately 80% of tumors arising in the brain stem are diffuse intrinsic lesions. Patients typically present with a short duration of symptoms and signs with significant neurological impairment. Imaging findings are typical, and biopsy is not usually necessary to make a diagnosis. Standard treatment consists of radiotherapy alone. Although the majority(More)
Between 1975 and 1989, 108 children with newly diagnosed medulloblastoma/primitive neuroectodermal tumor (MB/PNET) of the posterior fossa were treated at the authors' institution. The patients were managed uniformly, and treatment included aggressive surgical resections, postoperative staging evaluations for extent of disease, and craniospinal radiation(More)
OBJECT Some medulloblastomas (MBs) are characterized by extreme nodularity and intranodular nuclear uniformity in a fine fibrillary background. These lesions have also been designated as "cerebellar neuroblastoma." Although numerous reports have been published in which their morphological features have been investigated, only a few studies have been focused(More)
Primitive neuroectodermal tumors (PNETs) of the central nervous system, including medulloblastomas (PNET/MB), are the most common malignant brain tumor of childhood. These tumors often express proteins characteristic of glial differentiation (glial fibrillary acidic protein, GFAP), neuronal differentiation (neurofilament proteins, NFPs), and/or(More)
Twenty children with meningiomas (ages 18 months to 17 years) received initial therapy at the Children's Hospital of Philadelphia between January 1975 and June 1991, accounting for 2% of children with primary brain tumors seen during that time interval. All were verified histopathologically, and none had had prior irradiation. Fifteen were male and 5(More)
A rare embryonal brain tumor has been diagnosed in a 4-year-old boy. The mass, located at the pons and mesencephalon, has been histologically classified as an embryonal tumor containing abundant neuropil and true rosettes. After surgical complete removal of the neoplasia, the child received intensive combined chemotherapy and radiotherapy. He is alive and(More)
DISCUSSION The leptomeningeal dissemination (LMD) of low-grade gliomas (LGGs) is reported in clinical neuro-oncology practice more and more frequently. It is estimated that 5% of all childhood LGGs present LMD at diagnosis and 7-10% at the time of progression. LMD has been reported in association with almost all the known subtypes of LGGs. Furthermore,(More)
BACKGROUND The aim of this study was to assess the objective response rate (ORR) of children and young adults with recurrent medulloblastoma/primitive neuroectodermal tumor (MB/PNET) treated with temozolomide (TMZ). The secondary purpose was to analyze the toxicity profile of TMZ when administered orally for 5 days in 3 divided daily doses every 28 days. (More)
We report an 11-year-old boy with neurofibromatosis type 1 (NF1) and asymptomatic type I Chiari malformation. This association may be considered a pure coincidence, due to the relative frequency of the two conditions, but recent reports describing the same association suggest that type I Chiari malformation probably should be added to the list of(More)
Over the last 15 years, various oncology groups throughout the world have used the PRETEXT system for staging malignant primary liver tumours of childhood. This paper, written by members of the radiology and surgery committees of the International Childhood Liver Tumor Strategy Group (SIOPEL), presents various clarifications and revisions to the original(More)