Cryptorchidism Cryptorchidism is distinct from monorchism, the condition of having only one testicle. Though the condition may occur on one or both sides, it more commonly affects the right testis. A testis absent from the normal scrotal position may be: About two-thirds of cases without other abnormalities are unilateral; most of the other third involve both testes. In 90% of cases, an undescended testis can be felt in the inguinal canal. In a small minority of cases, missing testes may be found in the abdomen or appear to be nonexistent (truly "hidden"). Undescended testes are associated with reduced fertility, increased risk
Users' Guides to the Medical Literature Users' Guides to the Medical Literature The Users’ Guides to the Medical Literature is a series of articles originally published in the "Journal of the American Medical Association", later rewritten and compiled in a textbook, now in its third edition. The guides provide practical, clinician-friendly advice on all aspects of evidence-based medicine. During the late 1970s a group of clinical epidemiologists at McMaster University including Dr. David Sackett prepared a series of articles to assist clinicians interpreting clinical research. These articles, introducing the term "critical appraisal", appeared in the "Canadian Medical Association Journal" beginning in 1981. In 1990 Dr. Gordon