case_images: PMC11047234_01
case_images: (a-c) Axial, sagittal, and coronal computed tomography slices of the mass protruding from the right ilium. The red arrow shows the small medullary continuity at the base of the tumor (green star = BPOP, yellow arrow = psoas muscle, orange circle = colon, blue rectangle = kidney).. BPOP: Bizarre parosteal osteochondromatous proliferation.
case_images: 10.1177_2050313X241249608-fig1.jpg
case_images: PMC11047234_01_10.1177_2050313X241249608-fig1.jpg
case_images: fig1-2050313X241249608
case_images: There was a mass effect with pressure on the right psoas muscle (Figures 1(a)-(c) and 2(a), (b)).
case_images: View of the lesion through the incision over the posterior right ilium. The patient was lying on her left side (position and direction labeled). The head of the BPOP tumor is visualized (arrow).. BPOP: Bizarre parosteal osteochondromatous proliferation.
case_images: 10.1177_2050313X241249608-fig3.jpg
case_images: PMC11047234_01_10.1177_2050313X241249608-fig3.jpg
case_images: fig3-2050313X241249608
case_images: At this stage, a separate incision was made over the posterior right ilium, and dissection extended to the base of the tumor, which was removed with an osteotome (Figures 3-5).
case_images: Retractors holding the incision open as the BPOP (a star is next to the base of the tumor) is marginally excised with an osteotome.. BPOP: Bizarre parosteal osteochondromatous proliferation.
case_images: 10.1177_2050313X241249608-fig4.jpg
case_images: PMC11047234_01_10.1177_2050313X241249608-fig4.jpg
case_images: fig4-2050313X241249608
case_images: At this stage, a separate incision was made over the posterior right ilium, and dissection extended to the base of the tumor, which was removed with an osteotome (Figures 3-5).
case_images: The fully excised Nora's lesion before being sent to pathology analysis.
case_images: 10.1177_2050313X241249608-fig5.jpg
case_images: PMC11047234_01_10.1177_2050313X241249608-fig5.jpg
case_images: fig5-2050313X241249608
case_images: At this stage, a separate incision was made over the posterior right ilium, and dissection extended to the base of the tumor, which was removed with an osteotome (Figures 3-5).
case_images: Panoramic view: Mixture of cellular cartilaginous tissue and bone (H&amp; E, original magnification x 12.5).
case_images: 10.1177_2050313X241249608-fig6.jpg
case_images: PMC11047234_01_10.1177_2050313X241249608-fig6.jpg
case_images: fig6-2050313X241249608
case_images: Bizarre binucleated chondrocytes (H&amp; E, original magnification x 100) (red arrow indicates example).
case_images: 10.1177_2050313X241249608-fig7.jpg
case_images: PMC11047234_01_10.1177_2050313X241249608-fig7.jpg
case_images: fig7-2050313X241249608
case_images: Characteristic transition from one tissue type to another (chondro-osseous metaplasia), resulting in the formation of the "blue bone" (H&amp; E, original magnification x 40).
case_images: 10.1177_2050313X241249608-fig8.jpg
case_images: PMC11047234_01_10.1177_2050313X241249608-fig8.jpg
case_images: fig8-2050313X241249608