An exhaust-gas treatment arrangement for an exhaust gas system of an internal combustion engine, in particular diesel internal combustion engine, comprising: - at least one first exhaust-gas treatment unit and, downstream of the at least one first exhaust-gas treatment unit, an exhaust-gas treatment assembly, wherein the at least one first exhaust-gas treatment unit and the exhaust-gas treatment assembly are arranged axially one after the other in the direction of a flow-path longitudinal axis (L 2) of a flow path comprising the at least one first exhaust-gas treatment unit and the exhaust-gas treatment assembly, - at least one bypass flow channel, wherein the at least one bypass flow channel comprises a flow-channel inlet region for receiving exhaust gas upstream of the at least one first exhaust-gas treatment unit and a flow-channel outlet region for discharging exhaust gas into the flow path downstream of the at least one first exhaust-gas treatment unit and upstream of the exhaust-gas treatment assembly, - at least one second exhaust-gas treatment unit (40, 42) arranged downstream of the exhaust-gas treatment assembly, - an exhaust-gas/reactant mixing section provided downstream of the exhaust-gas treatment assembly and upstream of the at least one second exhaust-gas treatment unit (40, 42), having a mixing channel, which is elongate substantially in the direction of a mixing-section longitudinal axis (L 3), and a reactant discharging unit for discharging reactant into the mixing channel, wherein the mixing-section longitudinal axis (L 3) is substantially parallel to the flow-path longitudinal axis (L 2), characterized in that - a hydrocarbon introduction assembly is provided for introducing hydrocarbon into exhaust gas flowing through the exhaust-gas treatment arrangement, wherein the hydrocarbon introduction assembly comprises the at least one bypass flow channel as well as a hydrocarbon discharging unit for discharging hydrocarbon into the least one bypass flow channel, wherein the at least one bypass flow channel is furthermore configured for discharging hydrocarbon into the flow path downstream of the at least one first exhaust-gas treatment unit and upstream of the exhaust-gas treatment assembly, and - in that the flow path and the exhaust-gas/reactant mixing section overlap one another substantially completely in the axial direction, so that an inlet region of the exhaust-gas/reactant mixing section is positioned substantially in the same axial region in the direction of the mixing-section longitudinal axis (L 3) as an outlet region of the exhaust-gas treatment assembly, and an outlet region of the exhaust-gas/reactant mixing section is positioned substantially in the same axial region in the direction of the mixing-section longitudinal axis (L 3) as an inlet region of the at least one first exhaust-gas treatment unit. - at least one first exhaust-gas treatment unit and, downstream of the at least one first exhaust-gas treatment unit, an exhaust-gas treatment assembly, wherein the at least one first exhaust-gas treatment unit and the exhaust-gas treatment assembly are arranged axially one after the other in the direction of a flow-path longitudinal axis (L 2) of a flow path comprising the at least one first exhaust-gas treatment unit and the exhaust-gas treatment assembly, - at least one bypass flow channel, wherein the at least one bypass flow channel comprises a flow-channel inlet region for receiving exhaust gas upstream of the at least one first exhaust-gas treatment unit and a flow-channel outlet region for discharging exhaust gas into the flow path downstream of the at least one first exhaust-gas treatment unit and upstream of the exhaust-gas treatment assembly, - at least one second exhaust-gas treatment unit (40, 42) arranged downstream of the exhaust-gas treatment assembly, - an exhaust-gas/reactant mixing section provided downstream of the exhaust-gas treatment assembly and upstream of the at least one second exhaust-gas treatment unit (40, 42), having a mixing channel, which is elongate substantially in the direction of a mixing-section longitudinal axis (L 3), and a reactant discharging unit for discharging reactant into the mixing channel, wherein the mixing-section longitudinal axis (L 3) is substantially parallel to the flow-path longitudinal axis (L 2), characterized in that - a hydrocarbon introduction assembly is provided for introducing hydrocarbon into exhaust gas flowing through the exhaust-gas treatment arrangement, wherein the hydrocarbon introduction assembly comprises the at least one bypass flow channel as well as a hydrocarbon discharging unit for discharging hydrocarbon into the least one bypass flow channel, wherein the at least one bypass flow channel is furthermore configured for discharging hydrocarbon into the flow path downstream of the at least one first exhaust-gas treatment unit and upstream of the exhaust-gas treatment assembly, and - in that the flow path and the exhaust-gas/reactant mixing section overlap one another substantially completely in the axial direction, so that an inlet region of the exhaust-gas/reactant mixing section is positioned substantially in the same axial region in the direction of the mixing-section longitudinal axis (L 3) as an outlet region of the exhaust-gas treatment assembly, and an outlet region of the exhaust-gas/reactant mixing section is positioned substantially in the same axial region in the direction of the mixing-section longitudinal axis (L 3) as an inlet region of the at least one first exhaust-gas treatment unit.