RESUMEN
This study essentially aims to contribute to the immunohistochemical investigation of the use of pituitary tumor transforming gene (PTTG) as a marker of cell proliferation or advanced tumor grade in meningiomas of various WHO grades. In all, 51 cases were recovered in total, 21 Grade-I, 23 Grade-II and 7 Grade-III meningiomas. Mitotic index (MI), Ki-67/MiB-1 positivity percentage and PTTG expression were analyzed in correlation to each other as well as to the tumor WHO grades. All three biomarkers showed a high diagnostic significance and a strong association with WHO grades. In comparison, PTTG expression was on a par with the other two indices, and performed very well regarding identification of advanced grade tumors. PTTG may be considered an important diagnostic tool and serve in the future as a novel prognosticator of the biological behavior of all grade meningiomas as well as a useful high-risk patient selection tool.
Asunto(s)
Neoplasias Meníngeas/metabolismo , Neoplasias Meníngeas/patología , Meningioma/metabolismo , Meningioma/patología , Securina/metabolismo , Biomarcadores de Tumor/genética , Biomarcadores de Tumor/metabolismo , Proliferación Celular , Regulación Neoplásica de la Expresión Génica , Humanos , Antígeno Ki-67/genética , Antígeno Ki-67/metabolismo , Neoplasias Meníngeas/diagnóstico , Neoplasias Meníngeas/fisiopatología , Meningioma/diagnóstico , Meningioma/fisiopatología , Mitosis , Securina/genéticaRESUMEN
Schwannosis is a condition characterized by a benign proliferation of Schwann cells and an incomplete myelination of central nervous system axons following different chronic stimuli. It. has been mainly observed in the spinal cord. Various hypotheses have been put forward with respect to the appearance of Schwann cells inside the central nervous system since they exclusively populate the peripheral nervous system. According to these hypotheses, schwannosis seems to be either the result of aberrant migration under certain conditions, especially in response to spinal cord injury, or as a developmental abnormality in form of ectopia during ontogenesis.We report, for the first time, on the multifocal occurrence of this rare nosological entity in the brain stem. Furthermore we compare the histological and immunohistochemical profile of schwannosis to that of an intracerebral schwannoma taken from our archive.
Asunto(s)
Lesiones Encefálicas/diagnóstico , Tronco Encefálico/patología , Células de Schwann/patología , 2',3'-Nucleótido Cíclico 3'-Fosfodiesterasa/metabolismo , Adulto , Tronco Encefálico/metabolismo , Proliferación Celular , Humanos , Antígeno Ki-67/metabolismo , Masculino , Proteína Básica de Mielina/metabolismo , Proteínas de Neurofilamentos/metabolismo , Proteínas S100/metabolismo , Células de Schwann/fisiologíaRESUMEN
Lymphomas associated with Warthin's tumor (WT) are extremely uncommon and the majorities are of B cell type. We report the simultaneous occurrence of T-cell lymphoblastic lymphoma (T-LBL) and WT in an 81-year-old patient, who presented with fever, night sweats and enlargement of the right parotid gland. The parotidectomy specimen showed a WT with extensive replacement of the lymphoid stroma by T-LBL, but preservation of the oncocytic epithelium. Staging investigations revealed mediastinal and abdominal lymphadenopathy, bilateral pleural effusions and bone marrow infiltration, in keeping with stage IVB disease. The patient received combination chemotherapy treatment but responded poorly, and died three months after diagnosis. To our knowledge, this is the first case report of T-LBL involving WT. The present study indicates that the lymphoid stroma in WT belongs to the systemic lymphoid tissue and can be involved in disseminated lymphoma. It highlights the importance of careful examination of WT's lymphoid stroma for the possible presence of any coexistent malignancy.