PMC10165924_01
Preoperative magnetic resonance imaging. a T1WI; A well-defined mass, 1 cm in diameter, showing iso signal intensity. b T2WI; A mass showing low signal intensity with partial internal high signal intensity. c Fat-suppressed T1WI-gadlinium showing enhancement on the margin of the mass.
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The mass showed an isotense signal on T1-weighted images (T1WI), a low signal intensity with partial high signal intensity inside the mass on T2-weighted images (T2WI), and contrast enhancement on the margin of the mass was seen with gadolinium (Figure 1(a-c)).
Intraoperative findings and histopathological findings (hematoxylin and eosin staining, and immunohistochemical staining). a A yellowish-red mass was detected which was easily dissected from the skin and the tendon sheath. The mass strongly adhered to the neurovascular bundle on the ulnar side. b The tumor was relatively well circumscribed. c The lesions had high cellular density rather than fibrous tissues, with spindle-shaped cells in a storiform pattern. d CD68 was positive in spindle- shaped cells and it presented granular cytoplasmic pattern. e Factor XIIIa was also positive in spindle-shaped cells. f alpha-SMA was positive in the majority of spindle-shaped cells.
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However, it strongly adhered to the neurovascular bundle on the ulnar side (Figure 2(a)), so required careful dissection and excision.