case_images: PMC10769634_01
case_images: Magnetic resonance imaging finding of a mass in the left inferolateral side of the base of the penis, measuring 3.1 cm in maximum dimension.
case_images: CRIPA2023-7839846.001.jpg
case_images: PMC10769634_01_CRIPA2023-7839846.001.jpg
case_images: fig1
case_images: The corpus cavernosa and corpus spongiosum are both unremarkable (Figure 1).
case_images: Low- and high-power images show monophasic lesion composed of spindle cells arranged in intersecting fascicles and devoid of necrosis.
case_images: CRIPA2023-7839846.002.jpg
case_images: PMC10769634_01_CRIPA2023-7839846.002.jpg
case_images: fig2
case_images: The histopathologic examination revealed a neoplastic tissue composed of monophasic spindle cells arranged in intersecting fascicles and devoid of necrosis (Figure 2).
case_images: The lesion is mitotically active; the mitotic count is 3/10 HPF.
case_images: CRIPA2023-7839846.003.jpg
case_images: PMC10769634_01_CRIPA2023-7839846.003.jpg
case_images: fig3
case_images: The lesion stained positive for pancytokeratin, AE1/AE3, TLE-1, CD99, and BCL-2.
case_images: CRIPA2023-7839846.004.jpg
case_images: PMC10769634_01_CRIPA2023-7839846.004.jpg
case_images: fig4
case_images: Break-apart FISH for SS18. Arrows indicate the separation of 3'SS18 and 5'SS18 probes.
case_images: CRIPA2023-7839846.005.jpg
case_images: PMC10769634_01_CRIPA2023-7839846.005.jpg
case_images: fig5
case_images: The specimen was sent for molecular testing to the Mayo Clinic, which revealed a rearrangement involving the SS18 gene at 18q11.2 (Figure 5).