Anterolisthesis (also known as spondylolisthesis) is a forward slipping of the vertebra (spinal bone) over the bone below it. A pars defect is a stress fracture of the pars interarticularis, a thin bone connecting two vertebrae. Pars defects are a common injury caused by wear-and-tear and are often seen in those involved in high-risk sports (e.g. gymnastics, football, wrestling, weight lifting).
Bone cysts are benign (non-cancerous) lesions that develop inside a bone. Bone cysts usually do not cause any symptoms. However, sometimes they can expand in size and cause symptoms of pain or numbness when the adjacent nerve is compressed.
A bone island, also known as an enostosis, is a common incidental finding (found in passing when looking for something else) of a small area of dense bone inside the spongy part of the bone. Enostoses are common, present in up to 14% of individuals.The cause of bone islands is not known. They are most likely congenital (present from birth) or developmental in nature and are thought to represent either hamartomatous lesions (non-cancerous tumorlike malformations made up of an abnormal mixture of cells and tissues found in areas of the body where growth occurs) or failure of osteoclastic activity (the body's process of breaking down bone in order to build it up again) during bone remodeling. Bone islands are usually considered benign (non-cancerous), stable, nonprogressive lesions, with a preference for the long bones and the pelvis. They typically present without symptoms, do not cause pain and usually do not grow larger. Although bone islands have a characteristic appearance in the vast majority of cases, larger lesions may sometimes pose a diagnostic dilemma, particularly in the setting of known malignancy.
Congenital (from birth) spinal canal stenosis is when the space where the spinal cord runs through the spine is narrower than normal. Symptoms, if present, can include pain, numbness, tingling and/or weakness which could radiate into the extremities (arms or legs).
The centrum semiovale is the white matter oval shaped core of the cerebral hemispheres (the left and right side of the brain). White matter is the brain tissue that contains nerve fibers and serves as the connection to other parts of the brain. White matter hyperintensities are common changes seen on MRI in asymptomatic individuals (those with no symptoms), and their prevalence increases with age, to nearly 100% in those older than 90 years. The possible causes of white matter hyperintensities include chronic microvascular ischemic changes, vasculitis (blood vessel inflammation), migraine, Lyme disease or demyelinating disease.
A lesion is an abnormality seen on an imaging test. A bone lesion may involve small to large areas of your bone(s) and the severity of the underlying condition may range from relatively minor to life-threatening. These lesions will need further work up to for a diagnosis.
