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The potential of magnetic resonance imaging (MRI) in the evaluation of spinal hydatidosis has not yet been fully explored. Only a few sporadic case reports have demonstrated interesting capabilities for detection of cystic echinococcal lesions in and around the spine, but to our knowledge none has described the MRI findings in intradural hydatid cysts. We(More)
Forty-two fine-needle aspirates (FNA) of the mediastinum were reviewed from 1984-1995. The clinical, radiologic, pathologic, and cytologic material was studied. Twenty-five males and 17 females had an age range from 10-72 yr and a mean of 41 yr. Common complaints were chest pain, dyspnea, and cough. Thirty-eight tumors were in the anterior/superior(More)
There has been significant progress in the area of short-term scheduling of batch processes, including the solution of industrial-sized problems, in the last 20 years. The main goal of this paper is to provide an up-to-date review of the state-of-the-art in this challenging area. Main features, strengths and limitations of existing modeling and optimization(More)
Between April 1980 and June 1986, 274 patients underwent mitral valve replacement (MVR) with the Björk-Shiley (BS) standard disc mitral valve prosthesis at the American University of Beirut Medical Center (AUBMC). Eleven patients (3.9%) presented 6-41 months after surgery with prosthetic valve dysfunction due to thrombosis. Inadequate control of(More)
From 1980 to 1986, during the Lebanon war, five patients with missile embolization were seen at the American University of Beirut Medical Center. Three had entry in the heart or thoracic aorta with peripheral embolization, and two had entry in the internal carotid artery and inferior vena cava with embolization to the middle cerebral artery and heart,(More)
Over a 16-year period from January 1975 to December 1990, 823 patients with 840 vascular injuries were treated at the American University of Beirut Medical Center. Of these, 661 injuries involved peripheral vessels; 26 of which had 31 arteriovenous fistulae (AVF). Most of the AVF (80%) were diagnosed within 1 year from the injury. The most common presenting(More)
This paper presents two alternative decomposition approaches for the efficient solution of multistage, multiproduct batch scheduling problems comprising hundreds of batch operations. Both approaches follow the principle of first obtaining a good schedule (constructive stage), by considering only a subset of the full set of orders at a time, and then(More)