John Thomas sign

The John Thomas sign, also known as the Throckmorton sign, is the position of a penis as it relates to pathology on an x-ray of a pelvis. When the penis (visible on the x-ray as a shadow) points towards the same side as a unilateral medical condition (such as a broken bone), this is considered a "positive John Thomas sign", and if the shadow points to the other side, it is a negative John Thomas sign. This sign is of no medical significance and is employed as a humorous aside.