Borderline chondrosarcoma of long and flat bones

Area of Science:

• Orthopedic Oncology
• Skeletal Pathology
• Tumor Biology

Background:

• Borderline chondrosarcoma is a cartilaginous bone tumor with histomorphology resembling enchondroma.
• Clinical presentation includes vague pain and radiographic endosteal erosion.
• Recurrence and malignant transformation are potential complications.

Purpose of the Study:

• To investigate the immunohistochemical expression of collagen types I, II, III, V, and VI in borderline chondrosarcoma.
• To correlate collagen expression patterns with histological and clinical findings.
• To determine the optimal surgical management for borderline chondrosarcoma.

Main Methods:

• Histological and clinical data from six borderline chondrosarcoma cases were reviewed.
• Immunohistochemical analysis was performed to assess collagen types I, II, III, V, and VI expression.
• Tumor patterns and clinical outcomes, including recurrence, were analyzed.

Main Results:

• Predominant immunoreactivity for collagen types II and VI was observed in the tumor matrix.
• Heterogeneous expression of collagen types I, III, and V was noted.
• Cytoplasmic collagen type II expression was present in tumor cells of four cases and all recurrent tumors.
• Histological and collagen expression patterns were similar to low-grade chondrosarcoma.
• Two cases experienced local recurrence after intralesional or marginal excision, with one fatality due to unresectable recurrence.

Conclusions:

• Borderline chondrosarcoma exhibits collagen expression patterns akin to low-grade chondrosarcoma.
• The clinical behavior of borderline chondrosarcoma mirrors that of low-grade chondrosarcoma.
• Wide en-bloc excision is recommended over curettage for borderline chondrosarcoma to prevent recurrence.