J Korean Soc Radiol.  2017 Dec;77(6):421-424. 10.3348/jksr.2017.77.6.421.

Juxtacortical Osteoma of the Metatarsal Bone: A Case Report

• Kim SJ
• Park HJ
• Lee SY

• KMID: 2396502
• DOI: http://doi.org/10.3348/jksr.2017.77.6.421

Abstract

Osteoma is a benign bone-forming tumor composed of compact or mature trabecular bone and is limited almost exclusively to craniofacial bones, especially in the paranasal sinuses and mandible. It is typically a slow growing lesion that is asymptomatic, unless its size significantly increases to cause symptoms such as pain or other neurological symptoms, that happens more often in cases involving craniofacial bones. Radiological appearance of these tumors depends on their location. In cases of juxtacortical osteoma, it is crucial to differentiate between this type of tumor and parosteal osteosarcoma, sessile osteochondroma, and matured juxtacortical focus of myositis ossificans. However, in some cases, it is difficult to differentiate juxtacortical osteoma from above mentioned lesions only with radiologic appearance. We describe a case of an osteoma that arose from the second metatarsal bone, a rare anatomical location for osteoma.

MeSH Terms

Bone Neoplasms
Foot
Mandible
Metatarsal Bones*
Myositis Ossificans
Osteochondroma
Osteoma*
Osteosarcoma
Paranasal Sinuses

Figure

• 

  Fig. 1 Juxtacortical osteoma arising from the second metatarsal bone in a 61-year-old woman. A. Anterior-posterior plain radiograph of the right foot showing a small, well-demarcated, exophytic, sessile, calcified mass in the shaft of the second metatarsal bone (arrow). B-D. MR images of the second metatarsal bone. MR images reveal that the lesion has the same signal intensity as the cortical bone and reveals no cartilaginous cap. On coronal T1-weighted image (TR = 600, TE = 15) and sagittal, fat-suppressed, T2-weighted image (TR = 6000, TE = 100), the lesion is homogeneously hypointense (B, C, arrows). Contrast-enhanced, fat-suppressed T1-weighted image (TR = 600, TE = 15) reveal no enhancement (D, arrow). E, F. Histopathology revealing that the tissue consists of mature lamellar bone with multiple osteocytes in lacuna [E (H&E stain, × 100) and F (H&E stain, × 400)]. H&E = hematoxylin and eosin, MR = magnetic resonance, TE = echo time, TR = repetition time

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