Malignant chondroblastoma of extraskeletal origin

Area of Science:

• Orthopedic Oncology
• Pathology

Background:

• Chondroblastoma is a rare benign cartilaginous neoplasm typically found in long bone epiphyses, predominantly affecting males in their second decade.
• Extraskeletal chondroblastomas are exceptionally rare, with aggressive behavior and metastasis being infrequently documented.

Observation:

• A unique case of chondroblastoma is presented in a 62-year-old female, originating in the left popliteal fossa.
• This represents the first reported instance of an extraskeletal chondroblastoma in this location.
• The tumor exhibited locally aggressive characteristics and subsequently metastasized to the lungs.

Findings:

• The extraskeletal chondroblastoma demonstrated aggressive local growth and distant metastasis to the lungs.
• This case highlights the potential for chondroblastomas, even those of extraskeletal origin, to exhibit virulent behavior.

Implications:

• This case expands the known clinical spectrum of chondroblastoma, emphasizing the need for vigilance regarding extraskeletal presentations.
• It underscores the importance of considering aggressive behavior and metastatic potential in extraskeletal chondroblastomas, regardless of typical patient demographics.
• Findings may inform diagnostic and treatment strategies for rare chondroblastoma variants.