Unusual variations in Gantzer muscle and neurovascular structures of forearm

: Gantzer muscles are variants in forearm. They may cause compressive neuropathy affecting median or anterior interroseous nerve (Kiloh Nevin syndrome). Dual origin of Gantzer muscle forms tunnel which includes median nerve, this report reveals unique anatomical scenario where Gantzer muscle may compress and entrap median nerve.: Present study reported dual origin of gantzer muscles in right forearm. It was pierced by median nerve and brachial artery. Two anterior interroseous artery emerged from common interroseous artery. Later, both anterior interroseous artery anastomosed with posterior interroseous artery.: This variation is clinically significant since symptoms of median nerve compression caused by comparable changes are sometimes mistaken with symptoms caused by more prevalent causes like radiculopathy, carpal tunnel syndrome.: Noticed variation is particularly beneficial to hand surgeons since this unusual muscle serves as anatomical reference for procedures in this region. The safety and effectiveness of surgery are improved by knowledge of nerve variations. To the best of our knowledge, this variant has not been mentioned in current medical literature.