Pseudosarcomatous fasciitis of the breast. Cytologic and histologic features.

A rare case of pseudosarcomatous fasciitis of the breast is presented. Both the clinical examination and the mammographic findings led us to expect a malignant lesion. Fine needle aspiration biopsy cytology, however, was negative, with the cells observed indicating a benign lesion. The benignity was proven by histologic examination of the extirpated nodule. The usefulness of aspiration cytology in the diagnosis of this entity and the need for a combined methodology in the diagnosis of breast tumors are emphasized.