“…However, anatomical anomalies such as accessory or supernumerary rectus muscles are described rather rarely in the literature (Whitnall, 1911(Whitnall, , 1921Eisler, 1930;Lang, 1979). With the use of modern imaging procedures such as CT scanning and MRI and their contrast edge enhancing mode or soft tissue reconstruction mode (Tadmor and New, 1978;Langer et al, 1987;Ellis et al, 1991;Weir and Abrahams, 1997), distinct variations and anomalies may be revealed which can pose special problems in diagnostics; these may lead to inadvertent and false positive results, and consequently to incorrect considerations and actions.…”