Breast infection due to dirofilariasis.

We describe a case of dirofilariasis of the breast in a woman presenting with a breast lump. The mammogram and ultrasound appearances are described with histopathological correlation. The suspicion of a parasitic infection was raised by the presence of rod-like structures within a hypoechoic nodule on sonography, appearances that have not been previously described. The case illustrates an unusual diagnostic problem since it presented in a non-endemic area.