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Extraskeletal osteochondroma of the buttock
Sung-Chul Lim1, Yun-Sin Kim, Young-Sook Kim
1Department of Pathology, Chosun University Hospital, 588 Seosuk-dong, Dong-gu, Gwangju 501-140, Korea. sclim@mail.chosun.ac.kr
Journal of Korean Medical Science
|February 18, 2003
Summary
Extraskeletal osteochondromas are rare soft tissue tumors. This case highlights an unusual buttock presentation, emphasizing the need for considering these ossified masses in differential diagnoses.
Area of Science:
- Orthopedics
- Pathology
- Radiology
Background:
- Osteochondromas typically originate from bone metaphyses.
- Extraskeletal osteochondromas are uncommon soft tissue neoplasms, often arising from synovial tissues.
- Rarely, these tumors occur outside synovial compartments, frequently in the extremities.
Observation:
- A 44-year-old female presented with left buttock pain.
- Imaging revealed a well-defined osseous mass in the buttock soft tissue.
- Histological examination confirmed mature hyaline cartilage covered by a fibrous capsule, transitioning to cancellous bone.
Findings:
- The buttock mass was pathologically diagnosed as an extraskeletal osteochondroma.
- The lesion exhibited characteristic features of mature cartilage and gradual ossification.
- Radiological and MRI findings were consistent with this rare extraskeletal neoplasm.
Implications:
- The diagnosis of extraskeletal osteochondroma should be considered for discrete, ossified soft tissue masses.
- This case expands the known anatomical locations for extraskeletal osteochondromas.
- Accurate diagnosis relies on integrating clinical presentation, imaging, and pathological findings.