PMC10359671_01
a Clinical presentation of mass over left ring finger. b Resected specimen. c Radiograph left hand showing extensive destruction of phalanges of left ring finger. d MRI T2-weighted image showing heterogenous signal intensity within the mass.
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F1
It started at the finger base and gradually expanded to involve the entire finger, which markedly limited hand function (Fig. 1a). A plain radiograph showed a large soft tissue mass of the left ring finger that displaced neighbouring fingers (Fig. 1c). Local magnetic resonance imaging (MRI) showed an expansile mass arising from the proximal phalanx with a soft tissue component occupying the adjacent web spaces (Fig. 1d). Subsequently, the patient underwent rays amputation of the ring and small fingers and wound closure by means of a local ulnar-based flap originating from the small finger (Fig. 1b).
Haematoxylin and eosin (H&E) stain (a, b x40) exhibits spindle cells arranged in infiltrating the bone with highly collagenized stroma. c At high magnification (x400), tumour cells show uniform bland spindled to oval cells with vesicular nuclei and indistinct cytoplasm. Note the pinkish collagen fibres in between the tumour cells.
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F2
No significant nuclear atypia or mitosis was observed (Fig. 2).
a, b Left-hand appearance and function at 6-month follow-up.
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F3
At 6 months of follow-up, there was no local recurrence and he had good overall hand function with acceptable hand grip strength (Fig. 3).