ABSTRACT
In order to better understand the in vivo corrosion of biodegradable alloys, it is necessary to replicate the physiological environment as closely as possible. In this study, a novel flow chamber system is developed that allows the investigation of biodegradable alloy corrosion in a simulated physiological environment. The system is designed to reproduce flow conditions encountered in coronary arteries using a parallel plate setup and to allow the culturing of cells. Computational fluid dynamics and analytical methods are used as part of the design process to ensure that suitable flow conditions are maintained in the test region. The system is used to investigate the corrosion behavior of AZ31 alloy foils of different thickness, in test media with and without proteins and in static and dynamic solutions. It is observed that pulsatile flows, similar to those in the coronary arteries, significantly increase corrosion rates and lead to a different corrosion surface morphologies relative to static immersion tests.
Subject(s)
Absorbable Implants , Computer Simulation , Coronary Vessels , Materials Testing/instrumentation , Materials Testing/methods , Pulsatile Flow , Alloys , Corrosion , HydrodynamicsABSTRACT
We present a case of biphasic pulmonary blastoma, a rare primary malignant lung neoplasm, in a 48 year old man. Despite its resection followed by postoperative chemotherapy, the neoplasm recurred and the patient survived only 41 months after the diagnosis.
Subject(s)
Lung Neoplasms/therapy , Pulmonary Blastoma/therapy , Humans , Lung Neoplasms/diagnosis , Lung Neoplasms/pathology , Male , Middle Aged , Pulmonary Blastoma/diagnosis , Pulmonary Blastoma/pathology , Tomography, X-Ray ComputedABSTRACT
We report the case of a 32-year-old man with the onset of exercise-related dyspnea, chest pain and chest radiography simulating a pleural effusion. The computed tomography of the chest showed signs suggesting pleural liposarcoma. Because of these findings, a videothoracoscopy was performed which surprisingly showed the presence in the left pleural space of intrapleural omentum and spleen. This report underlines that the clinical manifestations of Bochdalek hernia in adults are variegate and in most cases preoperative diagnosis is not possible.
Subject(s)
Hernias, Diaphragmatic, Congenital , Liposarcoma/diagnosis , Pleural Neoplasms/diagnosis , Adult , Hernia, Diaphragmatic/diagnosis , Humans , Male , Thoracoscopy , Tomography, X-Ray ComputedABSTRACT
Subcutaneous emphysema (SE) is the presence of air or other gas in the subcutaneous tissue and is generally associated with pneumothorax and/or pneumomediastinum. We describe an unusual presentation of SE of the chest wall without radiological evidence of pneumothorax or pneumomediastinum, which aetiopathogenesis remains open to several hypotheses in spite of an accurate clinical study.