Magnetic resonance axillography for preoperative diagnosis of the axillopectoral muscle (Langer's axillary arch): a case report.

The axillary arch of Langer is the most common muscular variation in the axilla. Recognition of anatomic variations is important for surgeons to perform safe axillary surgery. We describe a case of a woman with breast cancer, in whom sentinel lymph node biopsy was successfully performed and the presence of this anomaly preoperatively diagnosed by magnetic resonance axillography.