[Lupus erythematosus profundus of the breast].

Lupus erythematosus of the breast is a rare disease. It causes very firm nodules that clinically may resemble carcinoma of the breast. Mammography does not show these nodules because of their high content of fatty tissue, whereas sonographically they can be identified as homogeneous, highly echogenic lesions in the subcutaneous fat with no capsule that are connected to the skin. CT shows them as lesions of low attenuation (-50 to -70 HU) in the subcutaneous fat.