Multifocal benign chondroblastomas: report of a case

Area of Science:

• Orthopedic Oncology
• Skeletal Tumors
• Bone Pathology

Background:

• Chondroblastoma is a rare, typically solitary bone tumor affecting adolescents and young adults.
• It most commonly arises in the epiphyseal region of long bones.
• Malignant transformation is exceptionally rare, though local recurrence can occur.

Observation:

• A patient presented with two distinct chondroblastomas.
• Tumors occurred in the tibia and calcaneus over a seven-year period.
• Neither tumor exhibited clinical or histological evidence of malignancy.

Findings:

• The development of multifocal benign chondroblastomas in separate anatomical sites is highly unusual.
• The absence of malignant features in both tumors supports a benign, albeit multifocal, disease process.
• This case challenges the typical presentation of chondroblastoma as a solitary lesion.

Implications:

• This case expands the understanding of chondroblastoma behavior, suggesting a potential for multifocal occurrence even without malignant transformation.
• It underscores the importance of thorough follow-up for patients with benign bone tumors.
• Further research may be warranted to explore the underlying mechanisms of multifocal benign chondroblastoma development.