Medical evidence is employed by plaintiffs chiefly to prove the causation and extent of personal injury damages, while defendants try to prove the slightness or lack of causal connection in such claims. Many types of medical reports are kept which may be used to substantiate the allegations of either party in personal injury actions. Of primary importance are the reports of physicians and hospitals, and reports upon the voluntary or compulsory examination of the plaintiff.
Margaret Mazza, Discovery of Medical Records, 9 Clev.-Marshall L. Rev. 162 (1960)