Chapter 9, Problem 7RQ

Pain is classified as a ________________________ diagnosis sign symptom syndrome

Why is it difficult to identify the cause of many nervous system disorders? The genes associated with the diseases are not known There are no obvious defects in brain structure The onset and display of symptoms varies between patients all of the above

Describe the likelihood of developing bilateral (both eyes affected) retinoblastoma in the inherited versus the sporadic form of the disease.