A hollow filter element, including: a filter medium for filtering a fluid; wherein the filter element is a conical-oval rounded filter element; wherein the filter medium circumferentially surrounds an interior flow space of the filter element, wherein the filter medium circumferentially encloses around an element axis such that filter medium at least in one direction radial to the element axis is smaller on a first of the end sides of the filter medium than on a second of the end sides of the filter medium; wherein the filter medium has a first end body arranged at least on the smaller end side; wherein the first end body has at least one leveling element in the at least one direction of the smaller extent with respect to the element axis in a radially outer segment with respect to the element axis.