Cat-scratch disease masquerading as a solitary tumor of the breast

Cat-scratch disease in breast lymph node tissue may present as a mass lesion and require clinical investigation to rule out malignancy. Four cases involving prepectoral lymph nodes have been diagnosed at the Armed Forces Institute of Pathology, Washington, DC. Mammographic findings of a smooth-edged soft-tissue density without spiculation or calcification may suggest the diagnosis. Warthin-Starry silver impregnation of tissue sections is the preferred method of diagnosis, and should be added to the diagnostic workup of granulomatous lesions of the breast.