A system for volumetric segmentation in a plurality of planar medical images, comprising: a display; a user interface; an electronic processor coupled to the display and the user interface; and memory coupled to the electronic processor and storing instructions that, when executed by the electronic processor, cause the system to: receive the plurality of planar medical images; generate a boundary of a candidate structure in the plurality of planar medical images using a segmentation model (109A, 109B); display, on the display, a first planar medical image from the plurality of planar medical images; receive, by the user interface, a user input indicating a region in the first planar medical image, wherein the user input comprises an axis drawn on the first planar medical image; compare the region indicated by the user input to the boundary of the candidate structure; and responsive to the region being at least partially within the boundary: generate a first planar contour of the candidate structure; and re-display, on the display, the first planar medical image showing the first planar contour of the candidate structure; and generate a finding record for the candidate structure including the boundary. a display; a user interface; an electronic processor coupled to the display and the user interface; and memory coupled to the electronic processor and storing instructions that, when executed by the electronic processor, cause the system to: receive the plurality of planar medical images; generate a boundary of a candidate structure in the plurality of planar medical images using a segmentation model (109A, 109B); display, on the display, a first planar medical image from the plurality of planar medical images; receive, by the user interface, a user input indicating a region in the first planar medical image, wherein the user input comprises an axis drawn on the first planar medical image; compare the region indicated by the user input to the boundary of the candidate structure; and responsive to the region being at least partially within the boundary: generate a first planar contour of the candidate structure; and re-display, on the display, the first planar medical image showing the first planar contour of the candidate structure; and generate a finding record for the candidate structure including the boundary. receive the plurality of planar medical images; generate a boundary of a candidate structure in the plurality of planar medical images using a segmentation model (109A, 109B); display, on the display, a first planar medical image from the plurality of planar medical images; receive, by the user interface, a user input indicating a region in the first planar medical image, wherein the user input comprises an axis drawn on the first planar medical image; compare the region indicated by the user input to the boundary of the candidate structure; and responsive to the region being at least partially within the boundary: generate a first planar contour of the candidate structure; and re-display, on the display, the first planar medical image showing the first planar contour of the candidate structure; and generate a first planar contour of the candidate structure; and re-display, on the display, the first planar medical image showing the first planar contour of the candidate structure; and generate a finding record for the candidate structure including the boundary.