Defense attorney Joe Amendola may present evidence about a condition known as Histrionic Personality Disorder.

CNN: June 17, 2012 -- Updated 2034 GMT (0434 HKT)

Dr. Elliot Atkins testified that he diagnosed Sandusky with histrionic personality disorder, a class of conditions called dramatic personality disorders, which are marked by unstable emotions and distorted self-images.

CNN: Sandusky doesn't testify; defense rests

Dr. Elliot Atkins testified that he diagnosed Sandusky with histrionic personality disorder, part of a class of conditions called dramatic personality disorders that are marked by unstable emotions and distorted self-images.

CNN: Attorneys: Sandusky's adopted son says he's also a victim