Figure Legends
Figure 1: Initial imaging, (A) axial chest CT, (B) coronal
chest CT, (C) F-18 FDG PET/CT, (D) ultrasound showing mass from lower
neck to posterior upper mediastinum
Figure 2: (A) The lesion was fatty tissue-like yellowsish mass
on gross examination. (B) Polygonal cells resembling brown fat with
multivacuolated cytoplasm were admixed with mature adipocytes in the
background of myxoid stroma. (C) Small, delicate, branching capillaries
were noted. (D) No significant nuclear atypism was seen. (E) CD31
immunostaining highlighted hibernoma cells and capillary endothelial
cells. (F) The recurred tumor at supraclavicular area had similar
histologic features with more pronounced myxoid stroma.
Figure 3: neck CT showing recurred tumor at left
supraclavicular area (red arrow), (A) axial view, (B) coronal view
Figure 4: Intraoperational photo of left supraclavicular
recurred hibernoma, (A) hibernoma was well circumscribed with capsule,
and delicate dissection was performed to save nearby structures, (B)
anterior plane of removed hibernoma, (C) posterior plane of removed
hibernoma