This is an anxiety/neurosis disorder resulting in the irrational fear of confined spaces. This is relevant to those patients who suffer with spine or limb pathology and require either a CAT scan or MRI, imaging tests that require that the patient be placed in a small space. Milder cases can be sedated with oral anti-anxiety agents, like Valium, an hour before the test. In more severe cases, the patient might have to be rendered unconscious or simply forego the test altogether.