Patient chair for transport and positioning of patients during mammography screenings and stereotaxie procedures. The infinitely variable back rest, 2 individually adjustable segments in the back rest and the height adaptable head cushion support any desired position for these procedures. Individually adjustable backrest segments/ arm supports for lateral orientation “park bench position” Height adjustable head rest Easy ingress with back rest up right. Arm rests fold away. Comfortable, relaxing patient positioning, seated upright or in a dorsal or lateral (park bench) position. The headrest and the 2 segments of the backrest are individually adjustable which assures a safe and comfortable lateral orientation of patient during stereotaxie procedures. The back board is adjustable and provides comfortable support. In critical situations the Trendelenburg position is available in just seconds.