T he patient is an asymptomatic 50-year-old black woman, native of Guinea (West Africa), who immigrated to Europe 10 years before presentation. Routine screening mammogram (Fig. 1) showed bilateral unusual serpiginous, tubular worm-like calcifications without an accompanying mass (Fig. 2), suggestive of a parasitic origin. Calcifications in the breast are common in benign and malignant lesions, but parasitic calcifications are uncommon. Onchocerciasis occurs in 34 countries in Africa, Latin America, and the Arabian Peninsula. This disease is caused by a filarial worm, Onchocerca volvulus , that is transmitted by the Simulium black fly.