Abstract: A breast treatment device including components to allow the positioning of a patient for medical treatment and ensuring the proper positioning of the patient's other breast to avoid its inadvertent treatment. A breast support is used to grip and securely hold the non-treatment breast in position on a sternal bridge which is easily positioned as warranted for a particular patient. The sternal bridge is positioned by moving support arms. The device includes cushions/supports for the patient's head, sternum, forearm, elbow, upper arm and hand.