Received 5 March 2011, Accepted 24 March 2011, Available online 23 June 2011. Spontaneous pneumomediastinum is defined as free air within the mediastinum, not associated with trauma. Causes include exercise, drugs, asthma, vomiting, difficult labour and Valsalva maneuvers. Itâs a rare, usually benign and self-limited condition, more prevalent in young males.
A youth bouncing on a trampoline. A trampoline is a device consisting of a piece of taut, strong fabric stretched over a steel frame using many coiled springs. People bounce on trampolines for recreational and competitive purposes.
Explore the diverse selection of trampolines at Sears to turn an ordinary backyard into an amusement park. Children and adults alike can have a blast on the bouncing surface of a trampoline. These springy devices are extra stable, thanks to the sturdy steel frame and corrosion-proof legs. Climb onto the jumping mat and get ready to fly.