Abstract
Abnormalities in the quantity and rhythm of the menstrual flow are, of course, frequently associated with definite anatomic lesions in the pelvis. This is especially true of menstrual excess, which is much more often due to local than to general causes. The opposite is true of deficiency or absence of the flow, although even complete and permanent amenorrhea may be caused by pelvic disease, as, for example, by lesions which destroy all ovarian tissue. Even when definite lesions are present, there is little doubt that the associated menstrual abnormalities are often to be explained by disturbances of function rather than by any mechanical effect of the lesions themselves. It is hard, in many instances, to draw the line between the rôles played by pathologic anatomy and pathologic physiology, especially in the present incomplete stage of our knowledge. In a large group of cases of amenorrhea and scanty menstruation (hypomenorrhea), and

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