Bone lesion...: The proximal phalanx is the first bone of the fingers and toes (the bone closest to the hand or foot). The cortex is the hard, outer portion of the bone. A lesion is just that - a spot that can be seen on x-ray of mri. Excatly what it is will need to be determined by a radiologist, or removed and diagnosed by a pathologist.
Answered 1/31/2014
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