A prostate resection apparatus comprising: a carrier having a proximal end and a distal end; at least one energy source (126; 220; 240) on the carrier to be positioned in the urethra when delivering energy radially outwardly; means for providing input parameters; output means to provide data to a display; an automated controller for controlling movement of the at least one energy source to effect volumetric tissue removal; and a processor comprising instructions configured to: provide an image of a prostate on a display visible to a user; receive a plurality of input parameters corresponding to an axial length and a radial distance of a predefined volume of tissue for treatment; show on the display a predefined tissue removal profile of the predefined volume on the image of the prostate on the display based on the plurality of input parameters; and show a treatment reference marker comprising a fixed reference marker and a movable marker on the image of the prostate, wherein the tissue removal profile is shown on the display in relation to the fixed reference marker and the movable marker and wherein the movable marker moves in relation to the fixed reference marker and the treatment profile to show a location and orientation of the at least one energy source to a target tissue during treatment. a carrier having a proximal end and a distal end; at least one energy source (126; 220; 240) on the carrier to be positioned in the urethra when delivering energy radially outwardly; means for providing input parameters; output means to provide data to a display; an automated controller for controlling movement of the at least one energy source to effect volumetric tissue removal; and a processor comprising instructions configured to: provide an image of a prostate on a display visible to a user; receive a plurality of input parameters corresponding to an axial length and a radial distance of a predefined volume of tissue for treatment; show on the display a predefined tissue removal profile of the predefined volume on the image of the prostate on the display based on the plurality of input parameters; and show a treatment reference marker comprising a fixed reference marker and a movable marker on the image of the prostate, wherein the tissue removal profile is shown on the display in relation to the fixed reference marker and the movable marker and wherein the movable marker moves in relation to the fixed reference marker and the treatment profile to show a location and orientation of the at least one energy source to a target tissue during treatment. provide an image of a prostate on a display visible to a user; receive a plurality of input parameters corresponding to an axial length and a radial distance of a predefined volume of tissue for treatment; show on the display a predefined tissue removal profile of the predefined volume on the image of the prostate on the display based on the plurality of input parameters; and show a treatment reference marker comprising a fixed reference marker and a movable marker on the image of the prostate, wherein the tissue removal profile is shown on the display in relation to the fixed reference marker and the movable marker and wherein the movable marker moves in relation to the fixed reference marker and the treatment profile to show a location and orientation of the at least one energy source to a target tissue during treatment.