These include paraplegia, quadriplegia, muscular dystrophy, post-polio syndrome and spina bifida. Many conditions that cause paraplegia or quadriplegia begin as monoplegia. It is associated with athetoid cerebral palsy and spastic quadriplegia. This class includes people with several disability types include cerebral palsy, quadriplegia and amputations. Non-fatal injuries for motorcycle accidents include the danger of paralysis, such as quadriplegia. The extent of paralysis varies from part of a limb to quadriplegia and respiratory failure. Spinal lesions may cause quadriplegia and patients with skull lesions may have headaches. If four limbs are affected by paralysis, tetraplegia or quadriplegia is the correct term. Motor ability varies, ranging from clumsiness in some to spastic quadriplegia in others. The condition of paralysis affecting four limbs is alternately termed "tetraplegia" or "quadriplegia". Spastic quadriplegia also presents a range of symptoms that affect the musculature. While tetraplegia or quadriplegia refers to paralysis of all 4, both arms and legs. His death was attributed to heart disease and pneumonia complicated by quadriplegia. A bilateral infarction in the pyramids of the medulla can result in motor quadriplegia. His brother stated the causes of his death were complications of quadriplegia and respiratory problems.