Mohr v. Williams, 104 N.W. 12 (Minn. 1905) is a decision of the Minnesota Supreme Court authored by Calvin L. Brown. For almost a century, this case has been used in first-year Torts classes in American law schools to teach students about consent.
Dr. Williams was a physician and surgeon, practicing in Saint Paul, Minnesota and specializing in disorders of the ear. Mrs. Mohr was a patient who came to Dr. Williams complaining of trouble with her right ear. Dr. Williams examined her right ear and he discovered that there was a large perforation in the eardrum, that there was a large polyp in the middle ear, and that the ossicles of the middle ear were probably diseased. Dr. Williams also examined Mrs. Mohr's left ear, but he was unable to make a full examination because of a foreign substance in the left ear.
On Dr. Williams' recommendation, Mrs. Mohr agreed to have surgery on her right ear to remove the polyp and diseased ossicles.Anesthetics were used during the operation. After the patient was unconscious, Dr. Williams made a full examination of Mrs. Mohr's left ear and discovered that it was in a worse state than her right ear: there was a small perforation high up in the drum membrane, hooded and with rough edges, and the bone of the inner wall of the middle ear was diseased and dead. Dr. Williams also examined the right ear and found that it was not in as bad a condition as he had anticipated. He therefore decided to operate on the left ear instead of the right, performing an ossiculectomy, removing a part of the drum membrane and scraping away the diseased portion of the inner ear.