Atypical giant chondroblastoma mimicking a chondrosarcoma

Area of Science:

• Orthopedic Oncology
• Skeletal Radiology
• Tumor Biology

Background:

• Chondroblastoma is a rare, benign tumor originating from chondroblasts.
• Typically affects the epiphysis of long bones in adolescents and young adults.
• Rarely, chondroblastomas can occur in flat bones, such as the scapula.

Observation:

• This case report details a chondroblastoma with atypical radiological findings.
• The tumor presented with features not typically associated with its usual presentation.
• Age non-concordance was noted, deviating from the common second-decade presentation.

Findings:

• Histologically typical chondroblastoma can exhibit aggressive behaviors.
• These aggressive behaviors include large size, pulmonary metastases, and local recurrence.
• Atypical presentations challenge standard diagnostic criteria for chondroblastoma.

Implications:

• Highlights the importance of considering chondroblastoma in differential diagnoses for bone lesions with unusual imaging characteristics.
• Emphasizes the need for thorough evaluation, even in cases with seemingly benign histology.
• Underscores the potential for aggressive behavior in chondroblastomas, regardless of typical presentation patterns.