Biopsy means study "in vivo",. But use the term identified with taking a sample of tissue for study or fragment thereof The purpose of a biopsy, is used in a patient with a tumor or any another form of disease, histological data obtained on the nature of disease.

The exact mechanism by which the menstrual bleeding occurs is not completely understood so perfect, though no doubt point out as the main factor of it to the decisive influence of hormonal changes in blood concentration of the vascular system of the endometrium.

We have studied the advantages, limitations and indications of the method of aspiration biopsy in a series of 80 breast tumors. From the results obtained it is concluded that this is a harmless method of great value in the anatomical diagnosis of ulcerated lesions in which biopsy should not be performed section; allows certain pre-operative diagnosis and nonsurgical in advanced cases, the only oprtunidad constitutye anatomical diagnosis. Close collaboration between the oncologist and pathologist, as a fundamental condition for good samples, and to provide proper interpretation of them is indispensable.