Fig 1.

Magnetic resonance imaging showing greater tuberosity cyst mapping system. (A, B) Axial views of level 1 (green), placed at the footprint, and level 2 (yellow), placed 10 mm below. (C) Coronal view showing levels 1 and 2. The humeral head is divided into 4 sections, named using uppercase letters (major width of the cyst in the section) and lowercase letters (minor width of the cyst in the section). In this case, the cyst mapping was “PL1PL2,” suggesting a prevalent posterior location of the cystic bone reabsorption. The cyst area was 3.2 cm² at level 1 and 2.4 cm² at level 2. (al, anterolateral; am, anteromedial; PL, posterolateral; pm, posteromedial.)