The discovery of oligodendroglia cells by Rio-Hortega: his original articles. 1921.

Comment on: del Río-Hortega P. Glia with very few processes (oligodendroglia). Clin Neuropathol.

A modern reproducible method for the histologic grading of astrocytomas with statistical classification tools.

Objective: To investigate whether statistical classification tools can infer the correct World Health Organization (WHO) grade from standardized histologic features in astrocytomas and how these tools compare with GRADO-IGL, an earlier computer-assisted method.

Study Design: A total of 794 human brain astrocytomas were studied between January 1976 and June 2005. The presence of 50 histologic features was rated in 4 categories from 0 (not present) to 3 (abundant) by visual inspection of the sections under a microscope.

The clinico-surgico-pathological spectrum of myxopapillary ependymomas--report of four unusal cases and review of the literature.

According to the WHO grading system, myxopapillary ependymomas are assigned to WHO Grade I. However, the clinico-pathological spectrum might be very heterogenous. Herein, we report 4 cases exhibiting lumbar tumor masses, 1 causing muscular atrophy over a 30-year period, 3 displaying clinical history of persisting lumbar pain for only several weeks.

Causal probabilistic modeling for malignancy grading in pathology with explanations of dependency to the related histological features.

This work demonstrates that histological grading of brain tumors and astrocytomas can be accurately predicted and causally explained with the help of causal probabilistic models, also known as Bayesian networks (BN). Although created statistically, this allows individual identification of the grade of malignancy as an internal cause that has enabled the development of the histological features to their observed state. The BN models are built from data representing 794 cases of astrocytomas with their malignant grading and corresponding histological features.

Choroid plexus tumors differ from metastatic carcinomas by expression of the excitatory amino acid transporter-1.

Tumors of the choroid plexus (CPTs) are rare neoplasms of neuroectodermal origin usually arising in pediatric patients. However, CPT may occur at any age, and their distinction from metastatic carcinomas is often difficult in adult cases. Because CPTs frequently show focal glial differentiation, we now investigated 35 CPTs (19 males and 16 females 0.

Different papillomaviruses have different repertoires of transcription factor binding sites: convergence and divergence in the upstream regulatory region.

Background: Papillomaviruses (PVs) infect stratified squamous epithelia in warm-blooded vertebrates and have undergone a complex evolutionary process. The control of the expression of the early ORFs in PVs depends on the binding of cellular and viral transcription factors to the upstream regulatory region (URR) of the virus. It is believed that there is a core of transcription factor binding sites (TFBS) common to all PVs, with additional individual differences, although most of the available information focuses only on a handful of viruses.

Juvenile psammomatoid ossifying fibroma of the neurocranium. Report of four cases.

Juvenile psammomatoid ossifying fibroma (JPOF) is a benign fibroosseous lesion predominantly arising within the paranasal sinuses in children and young adults. Neurocranial occurrence is exceedingly rare and a location within the neurocranial portion of the temporal bone has not been described. The authors report on one case of sinonasal JPOF secondarily extending into the cranial cavity and three cases primarily affecting the neurocranial bones to increase clinical awareness of this uncommon tumor, which may be easily mistaken for meningioma.

Histological heterogeneity of human glioblastomas investigated with an unsupervised neural network (SOM).

The histological variability of Glioblastomas (GB) precludes the modern assimilation of theses tumors into a single histological tumor group. As an alternative to statistical histological evaluation, we investigated 1489 human GB in order to discover whether they could be correctly classified using Self-Organizing Maps (SOM). In all tumors 50 histological features, as well as the age and sex of the patients, were examined.

The impact of progesterone receptor expression on relapse in the long-term clinical course of 93 benign meningiomas.

Background: Previous clinicopathological observations have pointed towards an impact of progesterone receptor (PgR) expression on the clinical course of meningiomas.

Materials And Methods: EXpression of PgR and the proliferation marker MIB-1 was assessed by immunohistochemistry in the primary tumours of 30 cases of benign, completely resected, recurrent meningiomas and compared with 63 cases of meningioma without recurrence for 14 or more years.

Results: Univariate analysis showed a significantly higher risk for recurrence (odds ratio 3.

The neuropathology and epidemiology of AIDS. A Berlin experience. A review of 200 cases.

The brains of 200 patients who died with Acquired Immunodeficiency Syndrome (AIDS) from Berlin were examined retrospectively. This study was specifically intended to evaluate and document the prevalence of neuropathologic abnormalities, establishing the frequency of the various types of structural lesions, their combinations, their relative incidence, and the risk factors involved in different age groups. The data were compared and contrasted with the findings reported from other parts of the world and other German cities.

[Malignant meningeal "histiocytosis"].

Two cases of patients with unusual pleomorphic tumors in the meninges are reported. Histologically and immunohistologically, the tumor cells may be histiocytic in appearance. Computed tomography and magnetic resonance imaging scans, however, revealed no lesions in the parenchyma or in the meninges.

Spinal extradural angiolipoma: case report and literature review.

A case report of a 12-year-old child with a spinal extradural angiolipoma is presented. The tumor was totally removed and a good recovery was obtained. In a review of 43 previous cases, the clinical, radiological, and histological features of the tumor are discussed.

[Intracerebral gliofibroma].

A 14-month-old girl had three epileptiform attacks in the course of 6 months, each consisting of rhythmic movements of the right arm and right hand of 5 minutes' duration, followed by a 15-minute period of weakness. There were otherwise no abnormal neurological signs. Prenatal and perinatal development had been uneventful and the mother was healthy.

Hypothalamic modulation of growth hormone secretion in the rhesus monkey: evidence from intracerebroventricular infusions of glucose, free fatty acid, and ketone bodies.

To evaluate the hypothalamus as a possible site of metabolic modulation of GH secretion, we studied the GH response to insulin hypoglycemia (IHG) and nicotinic acid (NA)-induced FFA depression in the absence and presence of third ventricular (ivt) infusions of glucose, oleic acid (Ol-Ac), or beta-hydroxybutyrate (beta OHB). Four rhesus monkeys had been prepared for chronic remote iv and ivt infusions as well as blood sampling from the adjacent room. Statistical evaluation used a two-way analysis of variance and individual comparisons with Tukey's Studentized range test.

Cerebral lymphoma in AIDS. Clinical, radiological, neuropathological and immunopathological study.

Neuropathological findings from 8 individual cases of cerebral lymphomas in AIDS patients with consideration of the clinical, radiological, immunopathological, and other pertinent data selected from a series of 80 patients between 1985 and 1989 were studied. A wide variation in pathology was noted among our cases. It has been shown that lymphoma as a neuropathological diagnosis can coexist with a wide range of other characteristics, including toxoplasmosis, glial nodules, neuronophagia, degeneration, bleeding, hypoxia, progressive multifocal leucoencephalopathy, and myelopathy, although none of these attributes appeared more than casually interrelated.

[Histopathologically verified cerebral CT findings in AIDS].

Computer tomographic and histopathological findings in 55 patients who died of the complications of acquired immunodeficiency syndrome, were reviewed retrospectively. In 23 patients (42%) an increased space of the internal or external cerebral spinal fluid was diagnosed. 20 patients (36%) had focal lesions.

Disseminated melanomatosis of the central nervous system and other organs: a case report.

This case represents an example of clinically occult, disseminated neoplastic disease with almost asymptomatic but severe involvement of the central nervous system. The only helpful diagnostic investigation appeared to be cerebrospinal fluid cytology. Extensive post mortem examination was inconclusive as to whether the widespread CNS involvement with melanoma was primary or secondary.

[Ultrastructural systematization of vascular changes in gliomas].

The fine structural features of microcirculation in benign gliomas, as compared to those in glioblastomas have insufficiently been studied. 36 astrocytomas and oligoastrocytomas (grades I and II) were examined with the electron microscope in order to classify the arterioles, capillaries and venules of these tumours. In all the gliomas, the number of arterioles was smaller than in the normal brain parenchyma.

Myelin basic protein (MBP) in human gliomas: a study of twenty-five cases.

Twenty five gliomas (5 oligodendrogliomas, 8 oligoastrocytomas, 5 astrocytomas grades I-II, and 7 malignant astrocytomas-glioblastomas) were studied with the immunohistochemical technique avidin-biotin complex (ABC) for myelin basic protein (MBP). We found four patterns of positivity with variable degrees and frequencies in the different types of tumors. We believe this method can help in the diagnosis of non-characteristic gliomas, particularly oligoastrocytomas.

Hemorrhagic infarction of the basal ganglia. An unusual complication of acute leukemia.

Hemorrhagic infarction of the basal ganglia was observed in 2 young adult patients with acute leukemia who presented with progressive hemiparesis combined with severe mental alterations. In case 1 (AML) lethal infarction due to thrombosis of both internal cerebral veins occurred during induction therapy for relapsed leukemia; in case 2 (cALL) a devastating stroke probably due to deep cerebral venous thrombosis happened during the third remission. Neither of them had hyperleukocytosis, signs of infection, disseminated intravascular coagulation or CNS leukemia.

Localization of adrenergic neurons in human and cat meninges.

In human and cat meninges the presence of adrenergic neurons was studied. The human meninges were obtained from 10 adult individuals 1-3 hours postmortem and the 6 cats meninges, one pretreated 7 days before the experiment with 5 mg of 6-OHDopamine intracisternally. In human and cat meninges, adrenergic granulations, located in fibers that form a reticulum around the arterial, arteriolar and small vein vessels were observed.