Figure 1. Macroscopic, imaging, and microscopic findings of the present case
a) Macroscopic findings. A 7-cm dome-shaped subcutaneous mass is observed on the left shoulder. b) T1-weighted magnetic resonance image. A subcutaneous mass measuring approximately 6.0× 5.0 × 2.5 cm is present in the left shoulder region. The mass is well-demarcated from the surrounding area without invasion into the deep muscular layer. The signal is heterogeneous, ranging from low to high, with a septal-like structure. c) Fat-suppressed T1-weighted magnetic resonance imaging. The overall signal is decreased. d)Microscopic findings (hematoxylin and eosin staining, ×40). The lobular proliferation of mature adipocytes, bundles of collagen fibers, and spindle-shaped cells are evident. e) Microscopic findings (hematoxylin and eosin staining, ×400). Adipocytes and spindle-shaped cells have neither atypical nuclei nor mitosis.