A proctoscope (1, 1') comprising: a body (2, 2'); a handle (3, 3') extending from the body (2, 2'); an elongated element (4, 4') comprising a forward end and an aft end, said aft end is attached to the body (2, 2') and open such that the interior of the elongated element (4, 4') is accessible via the aft end, said elongated element is extending along a longitudinal axis L, at least one opening (5; 5') formed in the elongated element between the forward and aft end, and / or a transparent section formed in the elongated element between the forward and aft end; a reference marking (9a, 9b, 9c) arranged along the at least one opening and / or transparent section, said reference marking is readable via the open aft end of the of the elongated element, characterized in that the proctoscope furthermore comprises a positioning device for supporting the proctoscope (1, 1') in the intended position relative a treatment area, said positioning device comprising: an elongated position adjustment device (7, 7') with a forward end contact surface, said position adjustment device (7, 7') is movably arranged along an axis substantially parallel to axis L in the body (2, 2') and extending from the body (2, 2') in the same direction as the elongated element (4, 4') from the body (2, 2'), and locking means (71, 71) arranged to secure the elongated position adjustment device (7, 7') in a selected position, wherein the forward end contact surface is intended to bear against the skin of a patient to maintain and support the proctoscope in a position along the longitudial axis is L where the treatment area is arranged in the intended position in relation to the reference marking (9a, 9b, 9c). a body (2, 2'); a handle (3, 3') extending from the body (2, 2'); an elongated element (4, 4') comprising a forward end and an aft end, said aft end is attached to the body (2, 2') and open such that the interior of the elongated element (4, 4') is accessible via the aft end, said elongated element is extending along a longitudinal axis L, at least one opening (5; 5') formed in the elongated element between the forward and aft end, and / or a transparent section formed in the elongated element between the forward and aft end; a reference marking (9a, 9b, 9c) arranged along the at least one opening and / or transparent section, said reference marking is readable via the open aft end of the of the elongated element, characterized in that the proctoscope furthermore comprises a positioning device for supporting the proctoscope (1, 1') in the intended position relative a treatment area, said positioning device comprising: an elongated position adjustment device (7, 7') with a forward end contact surface, said position adjustment device (7, 7') is movably arranged along an axis substantially parallel to axis L in the body (2, 2') and extending from the body (2, 2') in the same direction as the elongated element (4, 4') from the body (2, 2'), and locking means (71, 71) arranged to secure the elongated position adjustment device (7, 7') in a selected position, wherein the forward end contact surface is intended to bear against the skin of a patient to maintain and support the proctoscope in a position along the longitudial axis is L where the treatment area is arranged in the intended position in relation to the reference marking (9a, 9b, 9c). an elongated position adjustment device (7, 7') with a forward end contact surface, said position adjustment device (7, 7') is movably arranged along an axis substantially parallel to axis L in the body (2, 2') and extending from the body (2, 2') in the same direction as the elongated element (4, 4') from the body (2, 2'), and locking means (71, 71) arranged to secure the elongated position adjustment device (7, 7') in a selected position, wherein the forward end contact surface is intended to bear against the skin of a patient to maintain and support the proctoscope in a position along the longitudial axis is L where the treatment area is arranged in the intended position in relation to the reference marking (9a, 9b, 9c).