Humeral avulsion of the glenohumeral ligament (HAGL) is a traumatic lesion of the inferior glenohumeral ligament (IGHL), which occurs at its humeral insertion or in mid-portion (in opposition to GAGL, which is found at the glenoid insertion of IGHL).

IGHL is the most important static stabilizer of the humeral head during maximal abduction in the shoulder joint. It is reliably found in over 90% of cadaver shoulder joint studies. Despite these facts, the avulsion of this ligament may be in many cases asymptomatic.

It is a difficult lesion to diagnose using MRI without direct intraarticular contrast usage. In this case, the outflow of the contrast agent was clearly visible even at the time of injection, which was performed under fluoroscopic guidance.