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Biomedical subjects

J M Lopes

Publications and source records attributed to J M Lopes.

98 records · Page 6Linked to original sources
PubMedDate not supplied

[Indications of phototherapy for full term newborn infants with non-hemolytic hyperbilirubinemia: a critical analysis].

Phototherapy is a common procedure in the neonatal period. However there is great controversy in the literature about when and at which serum bilirubin levels phototherapy and exchange transfusion should be indicated. The aim of this paper is to review the literature and to suggest guidelines to help pediatricians in deciding when to treat non-hemolytic jaundice in full-term newborn infants.

English Abstract↗
PubMedDate not supplied

The ultrastructural spectrum of synovial sarcomas: a study of the epithelial type differentiation of primary tumors, recurrences, and metastases.

Synovial sarcomas (SS) are malignant soft tissue tumors of unknown origin. Their classification as carcinomas (monophasic synovial sarcomas, MSS) or carcinosarcomas (biphasic synovial sarcomas, BSS) still raises controversy. In an attempt to settle this controversy, an ultrastructural study was undertaken of 25 primary SS (12 BSS and 13 MSS), 5 recurrences (3 BSS and 2 MSS), and 2 metastases (2 BSS) based upon precise selection of different aspects of BSS and MSS on numerous semithin sections from each case. Ultrastructural markers of epithelial type differentiation of neoplastic cells were found in every type of cellular component of SS regardless of the tumoral pattern (biphasic or not). No major differences were found between MSS and the nonglandular areas of BSS (not even regarding the presence of abortive glandular lumina). Cytoarchitectural transitions were frequently observed; these included spindle to epithelioid cell types and fascicular to solid (MSS and BSS) or fascicular to glandular (BSS) patterns. These findings support the assumption that spindle cells of SS are neoplastic and may evolve to glandular cells in SS. Based on the cytogenetic data pointing to a common pathogenesis of both phenotypes (BSS and MSS), SS may represent true carcinomas of soft tissues with a biphasic and/or monophasic pattern depending on the degree of differentiation.

Adolescent↗
PubMedDate not supplied

Proliferative activity of synovial sarcoma: an immunohistochemical evaluation of Ki-67 labeling indices of 52 primary and recurrent tumors.

The relationship between cell differentiation and proliferation in biphasic synovial sarcoma (BSS) and the connection between the two components of these tumors and monophasic synovial sarcoma (MSS) are still unknown. In this study we specifically compared the Ki-67 labeling indices (Ki-67-LI) in the solid/glandular and spindle cell components of primary BSS (n = 8) as well as the values thus obtained in primary BSS both outside clear-cut biphasic areas (n = 7) and in primary MSS (n = 23). We also compare the Ki-67-LI of primary tumors (seven BSS, seven MSS) and their respective first recurrences. We observed that the cells of the solid/glandular component of BSS proliferate significantly faster (p = 0.007) than those of spindle cell areas. No significantly different Ki-67-LI were observed in the comparison of the solid/glandular areas of BSS with the spindle/epithelioid component of BSS without clear-cut biphasia and MSS. No significant differences of Ki-67-LI were observed in the comparison of primary tumors of both subtypes with their respective first recurrences. The implications of the low proliferative activity of the spindle cell component of BSS exhibiting clear-cut biphasia, which was also confirmed in a concurrent study using anti-proliferating cell nuclear antigen/Cyclin PC10, remains to be clarified.

Adolescent↗
PubMedDate not supplied

Malignant primitive neuroepithelial tumour of soft tissues mimicking a cellular ependymoma.

A malignant small blue-cell soft tissue tumour in a 13 year-old girl is reported. By light microscopy the tumour showed prominent pseudo-rosettes suggesting peripheral neuroepithelial tumour (PNET) with ependymal differentiation or extraspinal cellular ependymoma. Ultrastructural and immunocytochemical findings helped in excluding an ependymal neoplasm (low-grade malignancy) and supported the diagnosis of malignant primitive PNET mimicking a cellular ependymoma (high-grade malignancy).

Adolescent↗
PubMedDate not supplied

Successful treatment of Grover's disease with calcipotriol.

We report the case of an 84-year-old man with clinical, histological and electron-microscopic features of a Darier-like pattern of Grover's disease. The lesions had a persistent course, with a 5-month history before diagnosis and a clinical onset 2 years after the surgical removal of a cholangiocarcinoma. A significant clinical improvement was observed after a three-week course of calcipotriol ointment applied as a monotherapy regimen. Clinical uses of topical calcipotriol in dermatological conditions are reviewed with emphasis on dyskeratotic disorders.

Acantholysis↗