ANSWER
The diagnosis is chronic venous stasis. Venous vascular
insufficiency causes soft tissue edema and eventually
leads to striking changes in the bone and soft tissue
of the distal portion of the leg, as exemplified by
the periosteal proliferation seen in this patient. In
more advanced cases, one may see metaplasia of subcutaneous
tissues leading to calcification and ossification.
For further reading, see: D. Resnick, Diagnosis
of Bone and Joint Disorders, 3rd ed., W. B. Saunders
Co., 1995, p. 4434.
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