A method for representing a biological hollow organ is proposed. A 3D data record and a 2D data record are received. The 2D data record includes a part of a medical instrument, which is arranged within the biological hollow organ and has a point which can be detected in the 2D data record. The position of the detectable point is determined in the 2D data record and is transferred into the 3D data record. A subvolume of the 3D data record is determined. The center of gravity of the volume of the subvolume is the specific position of the detectable point in the 3D data record and the dimensions and the alignment of the subvolume can be predetermined. The subvolume of the 3D data record is visualized.
