Clear cell tumors of bone

Area of Science:

• Orthopedic Oncology
• Bone Pathology
• Skeletal Neoplasms

Background:

• Clear cell osseous neoplasms are rare, with metastatic renal cell carcinoma being a notable exception.
• Clear cell chondrosarcoma (CCCS) is the only distinct primary bone tumor in this category.
• CCCS predominantly affects males in their third and fourth decades, typically occurring in the proximal femur or humerus.

Purpose of the Study:

• To describe the clinicopathologic features of clear cell chondrosarcoma.
• To differentiate CCCS from other primary and metastatic clear cell bone tumors.
• To discuss the behavior and management of CCCS.

Main Methods:

• Review of radiologic and histopathologic findings in CCCS cases.
• Comparison of CCCS with other primary bone tumors exhibiting clear cell morphology.
• Analysis of recurrence, metastasis, and survival data for CCCS patients.

Main Results:

• CCCS presents as a well-circumscribed, lytic bone lesion, often calcified, with rare cortical breaches.
• Histologically, CCCS may show conventional chondrosarcoma foci or secondary features like giant cells and aneurysmal bone cyst-like areas.
• Approximately 25% of CCCS patients experience recurrence or metastasis, but tumor-related death is uncommon with complete resection.

Conclusions:

• Clear cell chondrosarcoma is a distinct, relatively indolent primary bone malignancy.
• Accurate diagnosis and complete en bloc resection are crucial for favorable outcomes in CCCS.
• Other primary clear cell bone tumors exist, including osteosarcoma and Ewing's sarcoma, with metastatic clear cell sarcoma being common in children.