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Pseudoanaplastic tumors of bone
Won-Jong Bahk1, Joseph M Mirra
1Department of Orthopaedic Surgery, Uijongbu St. Mary Hospital, The Catholic University of Korea, 65-1 Geumohdong, Uijongbu, Gyunggido, 480-821, Korea. wjbahk@cmc.cuk.ac.kr
Skeletal Radiology
|September 15, 2004
Summary
Pseudoanaplastic bone tumors exhibit concerning cellular changes but lack aggressive behavior. These benign lesions, despite mimicking sarcoma, do not show malignancy after treatment.
Area of Science:
- Oncology
- Pathology
- Orthopedic Surgery
Background:
- Pseudoanaplasia describes benign tumors with atypical cellular features.
- These changes can mimic malignant neoplasms, complicating diagnosis.
Purpose of the Study:
- To define pseudoanaplastic bone tumors.
- To establish diagnostic guidelines for these rare entities.
Main Methods:
- Reviewed 15 cases of pseudoanaplastic bone tumors from a database of 4,262 bone tumors.
- Clinical, radiographic, and pathologic data were analyzed.
- Follow-up ranged from 3 to 7 years post-treatment.
Main Results:
- Fifteen cases (0.35%) were identified, including variants of osteoblastoma, giant cell tumor, and chondromyxoid fibroma.
- Radiographic findings were consistently benign.
- Six cases were initially misdiagnosed as osteosarcoma due to cytologic atypia.
Conclusions:
- Pseudoanaplastic bone tumors demonstrate significant cytologic aberrations without malignant behavior.
- The findings support the concept of pseudoanaplasia in benign bone tumors, particularly in advanced stages.
- Accurate diagnosis is crucial to avoid unnecessary aggressive treatment.