Benign Metastasizing Leiomyoma of the Uterus with Pulmonary and Bone Metastases

Figure 2

Lung biopsy H&E stain (a) shows a spindle cell neoplasm with no atypia, necrosis, or increased mitoses that is positive for smooth muscle actin (b). The sternum biopsy (c) also histologically resembles the lung biopsy and shows a spindle cell neoplasm that did not have any malignant features. The sternum biopsy is positive for estrogen receptors (d) and progesterone as well. Since no malignant features were seen in either biopsy and given history of leiomyoma, a diagnosis of benign metastasizing leiomyoma was given.

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