Journal of Medical Cases, ISSN 1923-4155 print, 1923-4163 online, Open Access
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Case Report

Volume 12, Number 7, July 2021, pages 280-283

Primary Osteosarcoma of the Urinary Bladder Metastatic to Lung

Figures

Figure 1.
Figure 1. Computed tomography findings of the urinary bladder mass lesion (arrow denotes the tumor).
Figure 2.
Figure 2. (a) Hematoxylin and eosin-stained sections reveal malignant bone forming neoplasm formed of highly anaplastic cells (red arrows) admixed with abundant lace-like malignant osteoid (black arrows). Immunostained sections reveal that tumor cells are negative for CK (red arrow) which stains the lining urothelium (black arrow) (b). Tumor cells are positive membranous and cytoplasmic immunoreactivity for vimentin (red arrow) which is negative in the surface urothelium (black arrow) (c). Tumor cells (red arrows) show nuclear positivity for SATB-2 (red arrow) which is negative in the surface urothelium (black arrow) (d).