Primary bone lymphoma: polyostotic disease presenting as a cauda equina syndrome.

We report a patient with B-cell primary bone lymphoma with involvement of multiple vertebrae at presentation and rapid development of cauda equina syndrome. The patient presented subacute low-back pain, initially with good response to corticosteroid treatment.Primary bone lymphoma is a very unusual disease, commonly affecting only 1 vertebra. Despite this, our case involved multiple levels at the onset; furthermore, there were no adenopathies. Because of the information of the magnetic resonance imaging, an open biopsy of the vertebrae was performed for diagnosis. The reported cases of radicular syndromes secondary to a lymphoma as an initial symptom are extremely infrequently reported in the literature, above all for a B-cell lymphoma.