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Mammary myofibroblastoma: Report of two cases with fine‐needle aspiration cytology and review of the cytology literature

Fine‐needle aspirates from two histologically, immunohistochemically, and ultrastructurally confirmed mammary myofibroblastomas (MM) of two elderly women revealed abundant, randomly arranged single and clustered benign spindle‐shaped mesenchymal cells with scant cytoplasm and elongated or oval nuclei displaying a finely granular chromatin pattern and inconspicuous nucleoli. In one case a few cells showed inconspicuous nuclear grooves. The aspirated tumor cells from the other case stained positively with desmin and CD34 antibodies and negatively with cytokeratin and S‐100 protein antibodies, in keeping with an MM. A review of the literature was briefly presented. Diagn. Cytopathol. 2004;30:406–410. © 2004 Wiley‐Liss, Inc.