Solitary plasmacytoma of the cuboid.

Solitary plasmacytoma is an isolated malignant lesion of plasma cell origin. More than half of the reported cases of solitary plasmacytomas occur in the spine. Lesions occurring in the appendicular skeleton have a lower local recurrence rate and a favorable long-term survival rate. This is the first report of a solitary plasmacytoma involving a bone of the foot. With accurate diagnosis and effective medical treatment, long-term remission can be anticipated.