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Eduardo Rossi, Jesús Vaquero and Roberto Martínez

✓ A rare case of parailiac ectopic bone formation 10 years after a Cloward procedure is presented. Dystrophic calcification of a previous hematoma or deposit of bone dust were considered to be the origin of this unusual complication.

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Jesús Vaquero, Santiago Coca, Santiago Oya, Roberto Martínez, Josefa Ramiro and Francisco G. Salazar

✓ A monoclonal antibody against the surface marker IOT-10 of natural killer (NK) cells was used to investigate the presence of these cells in a series of 25 glioblastomas. In 40% of the tumors, IOT-10-positive NK cells were found in small numbers scattered among the tumor cells. The presence of IOT-10-positive NK cells was not related to the degree of lymphocytic infiltration in the tumor as demonstrated by hematoxylin and eosin staining, nor did it appear to influence the survival time of the patients studied.

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Jesús Vaquero, Santiago Coca, Rosa Magallón, Patricia Pontón and Roberto Martinez

✓ A monoclonal antibody against the surface marker IOT-10 of natural killer (NK) cells was used to investigate the presence and distribution of these cells in a series of nine primary intracranial germinomas. In all of these tumors, IOT-10-positive NK cells were found in small numbers, mainly distributed among the tumor cells. The data obtained in the present study suggest that the presence of NK cells in primary intracranial germinomas can be influenced by factors other than the mere quantity of tumor-infiltrating lymphocytes.

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Papillary pineocytoma

Case report

Jesús Vaquero, Santiago Coca, Roberto Martínez and Jorge Escandón

✓ A case of papillary pineocytoma is presented. It is necessary to be aware of this unusual histological type of pineocytoma in order to make a differential diagnosis among other types of papillary tumors that arise in the pineal region.

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Jesús Vaquero, Roberto Martínez and Alicia Arias

✓ Thirty patients with syringomyelia-Chiari complex who underwent posterior fossa decompression or syringosubarachnoid shunting were studied clinically and by magnetic resonance (MR) imaging to assess the changes in the syrinx and in their clinical picture after surgery. When symptoms of posterior fossa compression were present, posterior fossa decompression was performed; however, when symptoms of posterior fossa compression were absent, the choice of posterior fossa decompression or syringosubarachnoid shunting depended, respectively, on whether the syrinx was narrow or wide on MR imaging. At least 1 year after surgery, subjective improvement or arrest of disease was recorded in 73% of the patients. The present study suggests that: 1) the symptoms attributed to spinal cord damage have no significant relationship to the size of the syrinx on MR images; 2) the surgical techniques employed in this series (posterior fossa decompression or syringosubarachnoid shunt) were equally useful in inducing syrinx collapse; and 3) when posterior fossa decompression is performed, plugging of the obex is not necessary for syrinx collapse.

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Jesús Vaquero, Roberto Martínez, Santiago Coca, Santiago Oya and Raúl Burgos

✓ A case of secondary cerebral angiosarcoma in a 30-year-old man is presented. The patient had previously undergone heart transplantation for treatment of the primary tumor. Only a few cases of cerebral metastasis from angiosarcoma have been recorded in the literature; the present case is the first reported case diagnosed after heart transplantation.

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Jesús Vaquero, Mercedes Zurita, Santiago de Oya and Santiago Coca

Object. Predicated on the hypothesis that this cytokine can contribute to the development of vascular hyperpermeability, leading to tissue edema after trauma, the purpose of this study was to determine the presence in tissue of vascular endothelial growth/permeability factor (VEG/PF) after experimental spinal cord injury.

Methods. The presence of VEG/PF was studied at 8 hours and 2, 8, and 14 days after a traumatic injury in adult Wistar rats. Studies were conducted in which a monoclonal antibody to the VEG/PF was used. Strong VEG/PF immunoreactivity was detected in the walls of pial and intramedullary vessels and in reactive astrocytes 8 hours posttrauma and was unchanged on Days 2 and 8. By Day 14, immunoreactivity decreased, and most of the arterioles from the pia and gray matter showed no mural VEG/PF.

Conclusions. The authors' present findings suggest a role for this cytokine in the development of tissue edema after spinal cord trauma and point to the possible usefulness of a therapeutic approach to spinal cord injury based on blocking the cell expression of VEG/PF or its physiological effects.