Fig. 2.

Representative histologic images of bizarre parosteal osteochondromatous proliferation. H&E staining was used on tissue samples. A–C were obtained at 40× magnification; D–F were obtained at 100× magnification. (A) Representative image of BPOP with abundant ‘blue bone’. (B) Representative image of BPOP with prominent fibrous tissue. (C) Representative images of BPOP with prominent cartilage. In all cases a mixture of fibrous, osseous, and cartilaginous tissue is seen. (D–F) At high magnification, a variable appearance of ‘blue bone’ is seen between samples.