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Central low-grade osteosarcoma with pagetoid bone formation: a potential diagnostic pitfall.
Alessandro Franchi1, Patrizia Bacchini, Carlo Della Rocca
1Department of Human Pathology and Oncology, University of Florence, Florence, Italy. Franchi@unifi.it
Summary
Central low-grade osteosarcoma can mimic Paget's disease of bone, leading to diagnostic delays. Early recognition of aggressive radiographic features and thorough histologic sampling are crucial for accurate diagnosis and treatment of this rare bone cancer.
Area of Science:
- Orthopedic Oncology
- Skeletal Radiology
- Bone Pathology
Background:
- Central low-grade osteosarcoma is a rare bone malignancy.
- It is often challenging to differentiate from benign bone lesions radiographically and histologically.
- Mimicking Paget's disease of bone presents a unique diagnostic challenge.
Observation:
- Two cases of central low-grade osteosarcoma mimicking Paget's disease of bone in the proximal tibia are presented.
- Radiological findings included large, ill-defined, sclerotic lesions.
- Histological examination revealed features resembling Paget's disease, including thickened irregular bone plates and mosaic patterns, alongside focal conventional osteosarcoma characteristics.
Findings:
- One patient experienced disease progression after initial misdiagnosis and treatment for Paget's disease, with subsequent dedifferentiation to high-grade osteosarcoma.
- This patient developed local recurrence, metastases, and ultimately died.
- The second patient is alive and well 9 months after wide tumor resection.
Implications:
- These cases highlight the diagnostic difficulties and potential for delayed diagnosis of central low-grade osteosarcoma.
- Misdiagnosis can lead to inadequate treatment and progression to high-grade disease.
- Emphasizes the importance of recognizing aggressive radiographic signs and obtaining adequate histologic samples for definitive diagnosis.