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T Ribalta

Publications and source records attributed to T Ribalta.

At least 55 records · Page 3Linked to original sources
PubMed1990

Expression of lymphocyte, macrophage and class I and II major histocompatibility complex antigens in normal human dorsal root ganglia.

We analyzed the expression of lymphocyte, macrophage and class I and II (HLA-DR) major histocompatibility complex (MHC) antigens in normal dorsal root ganglia (DRG) from 19 patients without neurological disease by using an avidin-biotin immunoperoxidase technique. Satellite cells expressed class I and II MHC antigens. The intensity of HLA-DR staining varied among the DRG and was not related to age, history of cancer or infection, or number of T lymphocytes in the DRG. Monoclonal antibodies EBM11 and Leu-M3, that recognize cells of monocyte/macrophage lineage, stained a population of cells in all DRG. Positive cells had an elongated shape and were in the interstitial tissue between the satellite cells. These findings may be relevant to the understanding of the immune mechanisms involved in the neuronal damage of sensory neuropathies of presumably autoimmune origin such as those associated with small-cell lung cancer or Sjögren's syndrome.

Adolescent↗
PubMed1990

Subacute cerebellar syndrome as the first manifestation of AIDS dementia complex.

A patient presented with a subacute cerebellar syndrome in absence of cognitive impairment or other symptoms. He became demented several months after the onset of the disease. Necropsy demonstrated the typical features of the AIDS dementia complex and severe loss of Purkinje cells of the cerebellum. Patients with subacute cerebellar dysfunction should be evaluated for the presence of human immunodeficiency virus infection.

AIDS Dementia Complex↗
PubMed1990

Immunohistochemical analysis of the immune reaction in the nervous system in paraneoplastic encephalomyelitis.

We examined frozen sections of frontal cortex, medulla, and dorsal root ganglia from a patient with small-cell lung cancer and paraneoplastic encephalomyelitis, involving the medulla and dorsal root ganglia, with a panel of antibodies reactive for IgG, IgM, C3, B cells, T cells, T cell subsets, macrophages, and class I and II (HLA-DR) major histocompatibility complex (MHC) antigens. We detected an antineuronal antibody (anti-Hu) in the serum and CSF of the patient and found deposits of IgG in the periphery of some neurons in dorsal root ganglia. The infiltrates were almost exclusively T cells with a predominance of CD8-positive cells. Neurons did not express class I or II MHC antigens. Satellite cells in the dorsal root ganglia from the patient and controls were HLA-DR-positive. These data indicate that CD8-positive T cells predominate in the inflammatory infiltrates of paraneoplastic encephalomyelitis. IgG deposits may be relevant in the damage of the sensory neurons.

Antibodies, Monoclonal↗
PubMed1990

[Spinal cord metastasis of carcinoma of the lung: evaluation of magnetic resonance and computed tomography in its diagnosis].

A patient with lung adenocarcinoma had progressive myelopathy. Computed tomography of spinal cord with intravenous contrast and magnetic resonance scan were negative. At autopsy, a spinal cord metastasis was found. In patients with cancer and clinical suspicion of spinal cord metastasis, palliative treatment with radiotherapy is indicated in spite of negative radiological investigations, so as to prevent the progression of myelopathy.

Adenocarcinoma↗
PubMed1989

Experimental model of tumors associated with neurofibromatosis.

Four groups of animals, each composed of 22 pregnant Wistar rats, were used in this study. Single intraperitoneal (IP) injections of ethylnitrosourea (ENU) at a dose of 15 mg/kg body weight (BW) were given to the animals of two groups on days 15 and 21 of pregnancy, respectively. The progeny of a third group received by subcutaneous injection (SC) the same dose of ENU, 15 mg/kg BW, on day 1 postnatally. The descendants of the fourth group served as untreated controls. The most striking findings were observed in the progeny of the mothers treated on day 15 of pregnancy, in which group 64 of 180 descendants developed peripheral nervous system (PNS) tumors, 30% of which had plexiform pattern. One hundred fifteen of the 180 descendants developed central nervous system (CNS) gliomas, mainly oligodendrogliomas, and five animals presented with Wilms' tumors. No tumors of these types were observed in the untreated controls. Although descendants of mothers treated on day 21 of pregnancy had the highest number of PNS tumors (130 of 172 animals), only 21% of these tumors were plexiform; CNS gliomas were observed in 78 animals and Wilm's tumors in one animal. The lowest percentage of PNS tumors with plexiform pattern (16%) was found in the group of 157 descendants treated postnatally on day 1, in which 88 animals developed PNS tumors, 76 developed CNS gliomas, and no animals developed Wilms' tumors. The higher percentage of plexiform PNS tumors found in the descendants treated prenatally on day 15 of pregnancy was statistically significant (P less than 0.05) when compared with the percentage found in the group treated postnatally. This significance was also valid for the plexiform tumors that developed selectively from branches of the trigeminal nerves (of the PNS tumors from this location, 48% showed a plexiform pattern), but only in the progeny exposed to ENU on day 15 of pregnancy. This same progeny also had the highest numbers of CNS and Wilms' tumors. Because in humans, plexiform neurofibromas are considered to be the neoplastic markers of neurofibromatosis, and CNS gliomas as well as Wilms' tumors are associated with this disease, it is suggested that exposure to ENU on day 15 of pregnancy, under the experimental conditions described here, may offer a model for investigating tumors associated with neurofibromatosis, as well as aspects of the spontaneous, noninherited forms of this disease.

Animals↗
PubMed1989

[Carcinoma of the kidney as a complication of acquired cystic disease of the kidney in patients subjected to treatment with periodical hemodialysis].

Three cases of acquired cystic renal disease (ACRE) are reported in patients treated with periodical hemodialysis (HD) who developed neoplastic degeneration. In the first patient, diagnosis was a chance finding of nephrectomy during renal transplantation. The second patient was discovered following hematuria, and in the third patient disseminated metastases were the presenting feature of the disease. The finding of renal tumours associated with ACRE is a well known fact; however, metastatic disease has been infrequently reported. Generally, the denomination "adenoma" is adopted for tumours with a maximal diameter shorter than 3 cm, as they seldom develop metastases. However, the third patient had an adenocarcinoma measuring 2 cm in diameter. One of the parameters that best correlates the occurrence of ACRE and tumour development is the duration of HD; therefore, it is suggested that those patients who have received substitution therapy for longer than 3 years should undergo radiological studies for the early identification of these complications.

Adenocarcinoma↗
PubMed1989

Giant-cell arteritis presenting with ipsilateral hemiplegia and lateral medullary syndrome.

We describe the clinical and anatomopathological findings in an 85-year-old male presenting with a lateral medullary syndrome and ipsilateral hemiplegia (Opalski's syndrome) due to giant-cell arteritis of the vertebral artery. Other common associated symptoms of the disease were absent, and the erythrocyte sedimentation rate was only of 30 mm/h. This case emphasizes that limited intracranial giant-cell arteritis may present rarely as a stroke.

Aged↗
PubMed1988

Costochondral involvement in systemic candidiasis in heroin addicts: clinical, scintigraphic, and histologic features in 26 patients.

We studied the clinical, scintigraphic, and histopathologic characteristics of 26 intravenous drug abusers with costochondral involvement secondary to systemic infection with Candida albicans. The clinical findings were of a mass appearing in the anterior region of the thorax. In general, signs of inflammation were absent. Histopathologic study of this costochondral mass in 12 patients showed perichondritis in 100% and myositis in 87%, with secondary involvement of cartilage in 43% and of bone in 75%. Results of bone scintigrams using 99mTc-methylene diphosphonate were positive in only 7 of 15 patients (47%), with a correlation between positive uptake and osteitis. Gallium scintigraphy findings were positive in 9 of 10 patients (90%). The greater sensitivity of 67Ga was probably because the invariably present pericartilaginous inflammatory mass was not always accompanied by secondary cartilage and bone involvement.

Adolescent↗