PMC6197544_01
Magnetic resonance imaging shows an ossified mass (arrow) of approximately 25 mm in diameter in the thenar eminence in between the first and the second metacarpal bones.
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fig1
The magnetic resonance imaging showed a high-signal, well-defined lesion in the thenar region between the first and second metacarpal shafts, confined to a potential space between the thenar muscles ventrally and the adductor pollicis muscle dorsally (Fig. 1).
An excisional biopsy was planned through an incision to be made parallel and just ulnar to the thenar crease.
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fig2
Under regional anesthesia and tourniquet application an excisional biopsy was performed via an incision made parallel and just ulnar to the thenar crease (Fig. 2, Fig. 3).
Macroscopically the lesion was grayish white, well encapsulated and solid, exhibiting osseous consistency.
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fig4
On gross examination the lesion was grayish white, well encapsulated and solid, showing osseous consistency (Fig. 4).