Patient Presents With Pelvic Mass Lesion

Poll

A 43-year-old man presents with a mass lesion in the pelvis, and a biopsy is performed. What is your diagnosis?

A 43-year-old man presents with a mass lesion in the pelvis, and a biopsy is performed.

Based on the image, what is your diagnosis?

A. Giant-cell tumor of the bone
B. Mesenchymal chondrosarcoma
C. Dedifferentiated chondrosarcoma
D. Osteosarcoma