Exercise-induced asthma is a condition of respiratory difficulty (bronchoconstriction) that is related to histamine release,is triggered by aerobic exercise, and lasts several minutes. Causes include medical conditions, environmental factors, and medications. The image below illustrates the pathogenesis of asthma.
A myelogram is an invasive diagnostic test that uses x-rays to examine the spinal canal. A special dye is injected into the spinal canal through a hollow needle. An x-ray fluoroscope then records the images formed by the dye. Myelograms can show conditions affecting the spinal cord and nerves within the spinal canal.
Thoracic spine trauma. Axial CT myelogram in a patient with a gunshot wound to the thoracic spine. While a fracture is obvious, the injury also resulted in a dural tear with a freely leaking cerebrospinal fluid space (white arrow). The midline fracture of the vertebral body is noted in the lower image (black arrow).