J Korean Bone Joint Tumor Soc.  2014 Dec;20(2):104-108. 10.5292/jkbjts.2014.20.2.104.

Bizarre Parosteal Osteochondromatous Proliferation in the First Metatarsal Bone: A Case Report

• Kim WS
• Jung YH
• Oh SH
• Han EM

• KMID: 1799902
• DOI: http://doi.org/10.5292/jkbjts.2014.20.2.104

Abstract

Bizarre parosteal osteochondromatous proliferation (Nora's lesion) is a rare benign tumor and known to be primarily occur in the small tubular bone of the hands and feet. However, it is very unusual to be reported that it occurs in metatarsal bone in Korea. Thus, we report this tumor of metatarsal bone including the literature review because we have experienced this example.

Keyword

tumor of metatarsal bone; bizarre parosteal osteochondromatous proliferation; Nora's lesion

MeSH Terms

Foot
Hand
Korea
Metatarsal Bones*

Figure

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  Figure 1. Arrow at plain radiograph shows a bony mass in the both 1st metatarsal head dorsal area.

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  Figure 2. The MRI shows that the tumor is homogenous appearance and there is no bony deconstruction, medulla abnormality, continuity to bone marrow, that suggests bizarre parosteal osteochondromatous proliferation. (A) T1 enhanced image (B) T2 enhanced image (C) Enhancement of soft tissue and bursa around the tumor in the MRI with intravenous gadolinium contrast suggests inflammation of soft tissue due to irritation from tumor.

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  Figure 3. Gross specimen photo shows the 6.8×4.8×2.5 cm sized bony mass with cartilaginous cap.

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  Figure 4. The specimen was examined histologically, the lesion is composed of a cartilaginous cap, calcified cartilage matrix, cancellous bone, spindle cell that compose fibrous tissue. (A) H&E, ×12.5, (B) H&E, ×100.

Reference

References

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