A tissue resecting device includes an elongated shaft having a central axis, a distal end, and an outer surface. An offset housing is mounted on the distal of the shaft and has a tissue-receiving window. The tissue-receiving window is offset radially outwardly from the outer surface of the shaft, and a moveable electrode is configured to move back and forth across the window to resect tissue which extends into the window. The offset housing improves visibility of the cutting window when viewed from endoscopes and other visualization apparatus.