Entities causing spinal cord compression usually present as paraplegia or -paresis (or quadriplegia/ paresis), urinary retention (may require bladder ultrasound or checking a post-void residual to detect), and impaired sensation below the level of compression. May develop over hours or days. Reflexes may be hyper- or hypoactive. There may or may not be a Babinski sign. Excluding trauma, the most common cause is compression by tumor or bone.