PMC2627172_01
Left middle finger AP (A) and lateral (B) views show eccentrically located well-defined osteolytic lesion in the base of the distal phalanx (arrows). Calcific foci are noted in the mass and soft tissue mass component is obvious. On these radiographs, soft tissue mass with large cortical erosion is indistinguishable with eccentrically locating osteolytic mass with soft tissue extension.
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F1
Plain radiographs of the finger revealed a calcifying soft tissue mass associated with large cortical scalloping on the volar ulnar side of the distal phalanx (Fig. 1).
A. High-resolution US demonstrates lobulated soft tissue mass (arrows) with internal punctate hyper-echoic foci (calcifications). The mass is adhered and scalloped the cortex of the phalanx (arrowheads).. B. Color Doppler US shows hypo-vascularity of the mass.
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F2
On the high-resolution ultrasound (US) exam (HDI5000, Philips Medical System, Bothell, WA) with a high-frequency (15-7 MHz) compact linear transducer, a heterogeneously hyper-echoic mass with surface lobulation and extrinsic cortical erosion by the mass was clearly observable (Fig. 2A). The vascularity of the mass was not detected on color Doppler US (Fig. 2B).
Histological section shows scattered calcifications (solid arrows) with surrounding chondroid differentiation (arrowheads) on the background of the fibrosis with interlacing bundles of spindle cells (open arrows) (Hematoxylin and Eosin staining, x40).
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F3
Microscopic sections revealed a spindle-cell neoplasm with scattered calcifications and chondroid differentiation (Fig. 3).