An organ treatment apparatus for conditioning and preserving an organ of a donor, comprising: a container (14.1, 14.2, 14.3; 114; 214) for holding an organ (3.1, 3.2, 3.3); and a perfusion liquid circuit (5; 105; 205) comprising: - a pump, - an oxygenator, - a heat exchanger for at least cooling or heating liquid in the perfusion liquid circuit passing the heat exchanger, - a supply conduit (67; 167; 267) downstream of the oxygenator and the heat exchanger for supplying perfusion liquid from the oxygenator and the heat exchanger to an organ (3.1, 3.2, 3.3) in the container (14.1, 14.2, 14.3; 114; 214), and - a return conduit (68; 168; 268) upstream of the oxygenator and the heat exchanger for guiding perfusion liquid from the organ (3.1, 3.2, 3.3) inside the container (14.1, 14.2, 14.3; 114; 214) to the oxygenator and the heat exchanger, wherein the supply conduit (67; 167; 267) has a branch which is provided with an outlet port coupling (10.5; 110, 210) for connection to a perfusion catheter; wherein the return conduit (68; 168; 268) has a branch which is provided with an inlet port coupling (9.5; 109; 209) for connection to a return catheter; and wherein the perfusion liquid circuit further comprises a valve structure (69.1, 69.2, 69.3, 69.5) for selectively blocking or allowing liquid flow to the outlet port coupling(10.5) for connection to a perfusion catheter and for selectively blocking or allowing liquid flow to the container. a container (14.1, 14.2, 14.3; 114; 214) for holding an organ (3.1, 3.2, 3.3); and a perfusion liquid circuit (5; 105; 205) comprising: - a pump, - an oxygenator, - a heat exchanger for at least cooling or heating liquid in the perfusion liquid circuit passing the heat exchanger, - a supply conduit (67; 167; 267) downstream of the oxygenator and the heat exchanger for supplying perfusion liquid from the oxygenator and the heat exchanger to an organ (3.1, 3.2, 3.3) in the container (14.1, 14.2, 14.3; 114; 214), and - a return conduit (68; 168; 268) upstream of the oxygenator and the heat exchanger for guiding perfusion liquid from the organ (3.1, 3.2, 3.3) inside the container (14.1, 14.2, 14.3; 114; 214) to the oxygenator and the heat exchanger, - a pump, - an oxygenator, - a heat exchanger for at least cooling or heating liquid in the perfusion liquid circuit passing the heat exchanger, - a supply conduit (67; 167; 267) downstream of the oxygenator and the heat exchanger for supplying perfusion liquid from the oxygenator and the heat exchanger to an organ (3.1, 3.2, 3.3) in the container (14.1, 14.2, 14.3; 114; 214), and - a return conduit (68; 168; 268) upstream of the oxygenator and the heat exchanger for guiding perfusion liquid from the organ (3.1, 3.2, 3.3) inside the container (14.1, 14.2, 14.3; 114; 214) to the oxygenator and the heat exchanger, wherein the supply conduit (67; 167; 267) has a branch which is provided with an outlet port coupling (10.5; 110, 210) for connection to a perfusion catheter; wherein the return conduit (68; 168; 268) has a branch which is provided with an inlet port coupling (9.5; 109; 209) for connection to a return catheter; and wherein the perfusion liquid circuit further comprises a valve structure (69.1, 69.2, 69.3, 69.5) for selectively blocking or allowing liquid flow to the outlet port coupling(10.5) for connection to a perfusion catheter and for selectively blocking or allowing liquid flow to the container.