Figure 3From: Solitary pulmonary nodule of benign metastasizing leiomyoma associated with primary lung cancer: a case report Histopathology of the lung tumor in her left S4. (A) Pathological examination of the lung small nodule in her left S4 segment reveals that the tumor is composed of spindle-shaped smooth muscle cells and a low cuboidal metaplastic bronchiolar epithelium, surrounded by fascicles of smooth muscle cells without mitosis or nuclear atypia (hematoxylin and eosin staining, × 400). (B) Immunohistochemical staining for TTF-1 shows positive immunoreactivity in epithelial structures including alveoli or bronchioli (× 400). (C) Immunohistochemical staining for SP-A shows positive immunoreactivity for epithelial structures including alveoli or bronchioli (× 800). (D) Immunohistochemical staining for α-SMA is positive in spindle-shaped cells (× 400). (E) Immunohistochemical staining for ER is positive in spindle-shaped cells (× 400). (F) Immunohistochemical staining for PgR is positive in spindle-shaped cells (× 400).Back to article page