Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 7 de 7
Filter
1.
Rev. otorrinolaringol. cir. cabeza cuello ; 82(2): 212-215, jun. 2022. ilus
Article in Spanish | LILACS | ID: biblio-1389841

ABSTRACT

Resumen El tumor miofibroblástico inflamatorio (TMI) es una patología muy poco frecuente. Los TMI localizados en laringe pueden ocasionar disfonía o sensación de cuerpo extraño. El diagnóstico se realiza a través de pruebas de imagen y visualización directa con obtención de muestras para estudio histopatológico. Presentamos el caso de una mujer de 43 años, con antecedentes personales de carcinoma indiferenciado de nasofaringe, tratado con radioterapia y quimioterapia, que acude a revisiones periódicas en consulta de otorrinolaringología. Se objetiva por nasofibroscopia una lesión rugosa en cuerda vocal izquierda. Se realiza biopsia con fibroscopio de canal, compatible con tumoración fusocelular atípica, con áreas celulares y mixoides, sospechosa de malignidad, con necesidad de completar estudio inmunohistoquímico. En comité de tumores de cabeza y cuello se decide cirugía programada (laringectomía supracricoidea con cricohioidoepiglotopexia) y posterior tratamiento adyuvante con quimioterapia y/o radioterapia, según resultados del estudio histopatológico. Como conclusión, el TMI es una patología que se encuentra predominantemente en el pulmón, siendo rara la afectación laríngea. Su pronóstico es favorable y el diagnóstico histopatológico es de vital importancia. El diagnóstico correcto va seguido de una escisión local amplia para prevenir la recurrencia, sin embargo, el tratamiento debe adaptarse a la ubicación del tumor y al estado del paciente.


Abstract Inflammatory myofibroblastic tumor (IMT) is a very rare pathology. IMTs located in the larynx can cause dysphonia or foreign body sensation. The diagnosis is made through imaging tests and direct visualization and confirmation with samples for histopathological study. We present the case of a 43-year-old woman with a personal history of undifferentiated carcinoma of the nasopharynx treated with radiotherapy and chemotherapy, who attended periodic check-ups in an otolaryngology clinic. A rough granulomatous lesion was observed by nasofibrolaryngoscopy in the left vocal cord. A canal fibroscope biopsy is performed, compatible with an atypical spindle cell tumor, with cellular and myxoid areas, suspicious of malignancy, requiring an immunohistochemical study to be completed. The head and neck tumor committee decides on scheduled surgery (supracricoid laryngectomy with cricohyoidoepiglottopexy) and subsequent adjuvant treatment with chemotherapy and/or radiotherapy, according to the results of the histopathological study. As a conclusion finally, the IMT is a pathology found predominantly in the lung, laryngeal involvement being rare. Its prognosis is favorable and the histopathological diagnosis is of vital importance to be able to be differentiated from other malignant neoplasms. The correct diagnosis is followed by a wide local excision to prevent recurrence, however, treatment must be tailored to the location of the tumor and the condition of the patient.


Subject(s)
Humans , Female , Adult , Laryngeal Neoplasms/pathology , Laryngeal Neoplasms/diagnostic imaging , Immunohistochemistry , Tomography, X-Ray Computed , Laryngeal Neoplasms/surgery , Treatment Outcome , Myofibroblasts/pathology
2.
Braz. j. biol ; 82: 1-10, 2022. tab, ilus
Article in English | LILACS, VETINDEX | ID: biblio-1468470

ABSTRACT

The coupling of a ligand with a molecular receptor induces a signal that travels through the receptor, reaching the internal domain and triggering a response cascade. In previous work on T-cell receptors and their coupling with foreign antigens, we observed the presence of planar molecular patterns able to generate electromagnetic fields within the proteins. These planes showed a coherent (synchronized) behavior, replicating immediately in the intracellular domain that which occurred in the extracellular domain as the ligand was coupled. In the present study, we examined this molecular transduction - the capacity of the coupling signal to penetrate deep inside the receptor molecule and induce a response. We verified the presence of synchronized behavior in diverse receptor ligand systems. To appreciate this diversity, we present four biochemically different systems - TCR-peptide, calcium pump-ADP, haemoglobin-oxygen, and gp120-CD4 viral coupling. The confirmation of synchronized molecular transduction in each of these systems suggests that the proposed mechanism would occur in all biochemical receptor-ligand systems.


A ligação de um ligante com um receptor molecular induz um sinal que viaja através do receptor, chegando ao domínio interno e disparando uma cascata de resposta. Em trabalhos anteriores em receptores de células T e sua ligação com antígenos estranhos, observamos a presença de padrões moleculares planares capazes de gerar campos eletromagnéticos dentro das proteínas. Esses planos mostraram um comportamento coerente (sincronizado), replicando, instantaneamente, no domínio intracelular o que ocorreu no domínio extracelular, enquanto o ligante era acoplado. No presente estudo, examinamos essa transdução – a capacidade de um sinal de acoplamento de penetrar profundamente a molécula receptora e induzir uma resposta. Verificamos a presença de um comportamento coerente em sistemas diversos de receptor-ligante. Para apreciar essa diversidade, apresentamos quatro sistemas bioquímicos diferentes: TCR-peptídeo, ADP-bomba de cálcio, hemoglobina-oxigênio e gp120-CD4 acoplamento viral. A confirmação de transdução molecular sincronizada em cada um desses sistemas sugere que o mecanismo proposto ocorreria em todos os sistemas bioquímicos receptor-ligante.


Subject(s)
Peptides , Receptors, Cell Surface/analysis , Signal Transduction
3.
Braz. j. biol ; 822022.
Article in English | LILACS-Express | LILACS, VETINDEX | ID: biblio-1468657

ABSTRACT

Abstract The coupling of a ligand with a molecular receptor induces a signal that travels through the receptor, reaching the internal domain and triggering a response cascade. In previous work on T-cell receptors and their coupling with foreign antigens, we observed the presence of planar molecular patterns able to generate electromagnetic fields within the proteins. These planes showed a coherent (synchronized) behavior, replicating immediately in the intracellular domain that which occurred in the extracellular domain as the ligand was coupled. In the present study, we examined this molecular transduction - the capacity of the coupling signal to penetrate deep inside the receptor molecule and induce a response. We verified the presence of synchronized behavior in diverse receptor-ligand systems. To appreciate this diversity, we present four biochemically different systems - TCR-peptide, calcium pump-ADP, haemoglobin-oxygen, and gp120-CD4 viral coupling. The confirmation of synchronized molecular transduction in each of these systems suggests that the proposed mechanism would occur in all biochemical receptor-ligand systems.


Resumo A ligação de um ligante com um receptor molecular induz um sinal que viaja através do receptor, chegando ao domínio interno e disparando uma cascata de resposta. Em trabalhos anteriores em receptores de células T e sua ligação com antígenos estranhos, observamos a presença de padrões moleculares planares capazes de gerar campos eletromagnéticos dentro das proteínas. Esses planos mostraram um comportamento coerente (sincronizado), replicando, instantaneamente, no domínio intracelular o que ocorreu no domínio extracelular, enquanto o ligante era acoplado. No presente estudo, examinamos essa transdução a capacidade de um sinal de acoplamento de penetrar profundamente a molécula receptora e induzir uma resposta. Verificamos a presença de um comportamento coerente em sistemas diversos de receptor-ligante. Para apreciar essa diversidade, apresentamos quatro sistemas bioquímicos diferentes: TCR-peptídeo, ADP-bomba de cálcio, hemoglobina-oxigênio e gp120-CD4 acoplamento viral. A confirmação de transdução molecular sincronizada em cada um desses sistemas sugere que o mecanismo proposto ocorreria em todos os sistemas bioquímicos receptor-ligante.

4.
Braz. j. biol ; 82: e232525, 2022. tab, graf
Article in English | LILACS, VETINDEX | ID: biblio-1249239

ABSTRACT

The coupling of a ligand with a molecular receptor induces a signal that travels through the receptor, reaching the internal domain and triggering a response cascade. In previous work on T-cell receptors and their coupling with foreign antigens, we observed the presence of planar molecular patterns able to generate electromagnetic fields within the proteins. These planes showed a coherent (synchronized) behavior, replicating immediately in the intracellular domain that which occurred in the extracellular domain as the ligand was coupled. In the present study, we examined this molecular transduction - the capacity of the coupling signal to penetrate deep inside the receptor molecule and induce a response. We verified the presence of synchronized behavior in diverse receptorligand systems. To appreciate this diversity, we present four biochemically different systems - TCR-peptide, calcium pump-ADP, haemoglobin-oxygen, and gp120-CD4 viral coupling. The confirmation of synchronized molecular transduction in each of these systems suggests that the proposed mechanism would occur in all biochemical receptor-ligand systems.


A ligação de um ligante com um receptor molecular induz um sinal que viaja através do receptor, chegando ao domínio interno e disparando uma cascata de resposta. Em trabalhos anteriores em receptores de células T e sua ligação com antígenos estranhos, observamos a presença de padrões moleculares planares capazes de gerar campos eletromagnéticos dentro das proteínas. Esses planos mostraram um comportamento coerente (sincronizado), replicando, instantaneamente, no domínio intracelular o que ocorreu no domínio extracelular, enquanto o ligante era acoplado. No presente estudo, examinamos essa transdução ­ a capacidade de um sinal de acoplamento de penetrar profundamente a molécula receptora e induzir uma resposta. Verificamos a presença de um comportamento coerente em sistemas diversos de receptor-ligante. Para apreciar essa diversidade, apresentamos quatro sistemas bioquímicos diferentes: TCR-peptídeo, ADP-bomba de cálcio, hemoglobina-oxigênio e gp120-CD4 acoplamento viral. A confirmação de transdução molecular sincronizada em cada um desses sistemas sugere que o mecanismo proposto ocorreria em todos os sistemas bioquímicos receptor-ligante.


Subject(s)
Signal Transduction , Electromagnetic Fields , Receptors, Antigen, T-Cell/genetics , Ligands
6.
Quito; s.n; ene. 1999. 71 p. tab.
Thesis in Spanish | LILACS | ID: lil-249505

ABSTRACT

El hallazgo de masas ováricas, es un diagnóstico frecuente en la Ginecología. La importancia de su diagnóstico histológico es trascendental para un adecuado tratamiento. Por lo general, el estudio histológico se realiza durante (en el mejor de los casos) o después del proceso quirúrgico al cual fue sometida la paciente. Frente a esta realidad, nosotros decidimos investigar la utilidad de los criterios ecográficos en el diagnóstico histológico de las masas ováricas, con la finalidad de conocer previamente a la cirugía el pronóstico del caso evaluado. Para ello, estudiamos 33 pacientes con determinadas características, todas portadoras de masas ováricas y que fueron captadas en los Hospitales: Eugenio Espejo, SOLCA e Isidro Ayora. Todas las pacientes fueron examinadas clínicamente, destacándose en el examen la sintomatología que producían las masas ováricas y los datos gineco-obstétricos, así como la evaluación por examen pélvico bimanual. Posteriormente fueron realizadas ecografía transvaginal, determinando los criterios sonográficos establecidos para su estudio morfológico, así como la determinación de los índices de Pulsatilidad y Resistencia. Todas las pacientes fueron sometidas a cirugía, y durante la misma se realizó un estudio histológico por congelación, en los casos de sospecha de malignidad.


Subject(s)
Ovarian Neoplasms , Ovarian Neoplasms/diagnosis , Ovarian Neoplasms/surgery , Cysts
7.
Rev. méd. Panamá ; 22(1): 39-44, Jan. 1997.
Article in Spanish | LILACS | ID: lil-409833

ABSTRACT

Eosinophilic fasciitis is a disorder characterised by induration of the skin due to chronic inflammation and fibrosis of the subcutaneous septa and muscular fascia. It is different from sclerodermia. This is a clinical entity that presents as swelling, tenderness and stiffness of the extremities associated with peripheral eosinophilia. We described a patient with this disorder with 18 month of evolution who had a bilateral carpal tunnel syndrome. Her disease appeared after steroid treatment. A review of medical literature demonstrated that similar clinical pictures are originated by different causes. Some authors propose to encompass this group of disorder under the designation of [quot]fasciitis-panniculitis syndrome[quot] instead of [quot]eosinophilic fasciitis[quot] although the well-known eosinophilic fasciitis is clearly recognized and demonstrated


Subject(s)
Humans , Female , Middle Aged , Eosinophilia/diagnosis , Fasciitis/diagnosis , Biopsy , Diagnosis, Differential , Eosinophilia/therapy , Scleroderma, Systemic/diagnosis , Fasciitis/therapy , Muscles/pathology , Carpal Tunnel Syndrome/diagnosis
SELECTION OF CITATIONS
SEARCH DETAIL