A 47 year old woman who presented with a painless mass between the third and fourth fingers.

Images of the hand are as follows:

figure 2a
Fig. 2a: Gray scale image shows a solid hypoechoic lesion on the palmar side of the hand between the third and fourth metacarpal bones that abuts the flexor tendon sheaths of the third and fourth flexor tendons.
figure 2b
Fig. 2b: Color Doppler flow shows peripheral and central flow on color Doppler in the mass described in figure 2a.

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