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Gravitational search algorithm (GSA) is a swarm intelligence optimization algorithm that shares many similarities with evolutionary computation techniques. However, the GSA is driven by the simulation of a collection of masses which interact with each other based on the Newtonian gravity and laws of motion. Inspired by the classical GSA and quantum… (More)
Central nervous system sarcoidosis and its varied neuroradiological manifestations are reviewed. Two cases of mechanical obstruction secondary to sarcoid granulomata at the outlet of the fourth ventricle are described.
Low back pain developed in a 44-year-old woman with a history of rheumatoid arthritis. Radiographs of the lumbar spine revealed bilateral pedicle defects at L-3, L-4, and L-5, with widening of the spinal canal and spondylolisthesis of L-5 on S-1. CT more clearly demonstrated bilateral retrosomatic clefts at multiple levels.