leiomyosarcoma. (a) Malignant BSCTs cytology, cellular smear with sheets of spindle cells, Papanicolaou staining × 400. (b) Another field showing neoplastic ovoid cells, Papanicolaou staining × 400. (c) Well circumscribed tumor pushing the normal ductal cells at the periphery, H&E × 10. (d) Spindle cells are merging from blood vessels, H&E, × 10. (e) Desmin IHC highlighting cells merging from the blood vessels, DAB Hx × 400. (f) Intersecting fascicles of pleomorphic malignant spindle cells having cigar shaped blunt ended nuclei, H&E, × 400. (g) Desmin IHC, DAB, Hx × 400. See additional files 16, 17, 18, 1920, 21, 22 for higher resolution images.