Lie on your back with the leg you want to exercise straight. The other knee should be bent to support your lower back. Tighten the muscle on the top of your thigh and lift to the level of your other knee. Slowly lower.
While it was originally believed that most vascular malformations are present at birth (congential), cavernous malformation lesions may develop throughout the lifetime of the affected individual. Other vascular malformations are not congenital, but are caused by trauma, radiation, or other injury to the spinal cord.
There are a variety of causes of congenital malformations including: 1) genetic factors (chromo-. somal abnormalities as well as single gene defects); 2) environmental factors (drugs, toxins, infec-. tious etiologies, mechanical forces); and 3) multifactorial etiologies including a combination of. environmental and genetic factors.