ABSTRACT
Aims: Sinus of Valsalva aneurysms are rare anomalies. Aneurysmal dilatation of the sinuses of Valsalva in Marfan syndrome has been extensively studied. The aim of this study was to investigate clinical manifestation, diagnosis, histopathological findings and management of sinus of Valsalva aneurysms in non-Marfan patients. Study Design: Retrospective analysis, case-series. Methodology: A search of digital echocardiographic recordings, histopathology and electronic patient databases in our institution for the period 2004 – 2012 was performed. All patients with asymmetrical dilatation of at least one coronary sinus of Valsalva at postmortem and ruptured (or dissected) aneurysms on echocardiogram were included. Patients with Marfan syndrome and those with non-ruptured sinus of Valsalva aneurysms on echocardiogram were excluded. Results: A total of 12 patients (7 males; mean age 36.1 years) were studied. The right coronary sinus was the most commonly affected (9/12). Involvement of more than 1 sinus was seen in 3/12 cases. Four patients died suddenly and another 6 had acute or rapidly worsening symptoms. Three sudden deaths were due to dissection or rupture with haemopericardium and tamponade. Five cases had concomitant congenital heart defects. Conclusion: Sinus of Valsalva aneurysms are an uncommon cause of morbidity and mortality in non-Marfan patients. They are associated with certain congenital heart defects. There is often associated aortopathy. Sudden death can be the first manifestation and is most commonly due to aneurysm rupture or aortic dissection into the pericardial space. Echocardiography is the investigation of choice for diagnosis and follow-up. Prompt surgical or percutaneous intervention has an excellent long-term outcome.
ABSTRACT
OBJECTIVE: To establish reproducible electron microscopic criteria for identifying the four major types of neuroendocrine tumors of the lung: carcinoid; atypical carcinoid; large cell neuroendocrine carcinoma; and small cell carcinoma. METHODS: Measurements were made on electron micrographs using a digital image analyzer. Sixteen morphometric variables related to tumor cell differentiation were assessed in 27 tumors. The examination under electron microscopy revealed that all of the tumors could be classified as belonging to one of the four categories listed above. Cluster analysis of the morphometry variables was used to group the tumors into three clusters, and Kaplan-Meier survival function curves were employed in order to draw correlations between each cluster and survival. RESULTS: All three clusters of neuroendocrine carcinomas were found to be associated with survival curves, demonstrating the prognostic significance of electron microscopic features. The tumors fell into three well-defined clusters, which represent the spectrum of neuroendocrine differentiation: typical carcinoid (cluster 1); atypical carcinoid and large cell neuroendocrine carcinoma (cluster 2); and small cell carcinoma (cluster 3). Cluster 2 represents an intermediate step in neuroendocrine carcinogenesis, between typical carcinoid tumors and small cell carcinomas. CONCLUSIONS: Our findings confirm that electron microscopy is useful in making the diagnosis and prognosis in cases of lung tumor.
OBJETIVO: Estabelecer, com ajuda do microscópio eletrônico, critérios que possibilitem uma diferenciação mais exata entre os quatro tipos maiores de tumores neuroendócrinos pulmonares: tumor carcinóide típico e atípico, carcinoma de grandes células neuroendócrino e carcinoma de pequenas células. MÉTODOS: Todos os tumores foram avaliados morfometricamente e 16 variáveis foram relacionadas com diferenciação das células tumorais; estas variáveis foram analisadas sob microscopia eletrônica com ajuda de um analisador de imagem digital em 27 tumores. A avaliação através da microscopia eletrônica revelou que todos os tumors investigados podiam ser classificados a um dos quarto tipos listados acima. A análise das variáveis morfométricas foi usada para agrupar os tumores em três grandes grupos, os quais foram relacionados à sobrevivência pelas curvas de Kaplan Meier. RESULTADOS: Os três grupos de carcinoma neuroendócrino associaram-se às curvas da sobrevivência, as quais mostraram características ultrastruturais na microscopia eletrônica de significância prognóstica distinta. Os tumores foram contidos em três grupos bem definidos, que representam o espectro da diferenciação neuroendócrina: tumor carcinóide (grupo 1); tumor carcinóide atípico e carcinoma de grandes células neuroendócrino (grupo 2); e carcinoma de pequenas células (grupo 3). O grupo 2 representa um espectro intermediário na carcinogênese neuroendócrina, entre o carcinóide típico e o carcinoma de pequenas células. CONCLUSÕES: Nossos achados confirmam que a microscopia eletrônica é uma ferramenta útil no diagnóstico e prognóstico dos casos de tumores pulmonares.