AtlasMalignantChondrosarcoma of the Jaws

Malignant Tumors

Chondrosarcoma of the Jaws

Malignant cartilage-producing mesenchymal tumour; in the jaws it favours the anterior maxilla and behaves aggressively despite indolent histology.

Site
Anterior maxilla
Matrix
Cartilage
Rx
Wide resection

§ overviewOverview

Malignant tumour of mesenchymal cells producing a cartilaginous matrix.

§ icdICD Classification

C41.0/C41.1

§ etiologyEtiology

  • 01Primary (de novo)
  • 02Secondary: from enchondroma, osteochondroma, Ollier / Maffucci syndromes
  • 03Post-irradiation

§ epidemiologyEpidemiology

Head & neck ≈ 5–10% of chondrosarcomas; maxilla > mandible; adults 30–60 y.

§ clinicalClinical Features

  • 01Painless swelling of anterior maxilla or condyle
  • 02Loose teeth, nasal obstruction, proptosis
  • 03Slow but relentless growth

§ differentialDifferential Diagnosis

  • 01Osteosarcoma
  • 02Chondroma
  • 03Chondromyxoid fibroma
  • 04Ameloblastoma

§ histopathHistopathology

  • 01Lobules of atypical chondrocytes in hyaline/myxoid matrix
  • 02Binucleate lacunar cells
  • 03Grade I–III based on cellularity and pleomorphism

§ radiographicRadiographic Features

  • 01Poorly defined radiolucent-radiopaque lesion
  • 02'Snowflake' or 'popcorn' calcifications
  • 03Widening of PDL space (Garrington sign — shared with osteosarcoma)

§ investigationsInvestigations

  • 01CT (matrix calcification) and MRI (soft-tissue extent)
  • 02Incisional biopsy
  • 03Chest CT for metastases

§ treatmentTreatment

  • 01Wide surgical resection with clear margins (mainstay)
  • 02Radiotherapy — limited efficacy; used for unresectable/positive margins (proton beam)
  • 03Chemotherapy generally ineffective except mesenchymal variant

§ complicationsComplications

  • 01Local recurrence common if margins positive
  • 02Distant metastases (lung) in high-grade

§ prognosisPrognosis

5-yr survival: Grade I ≈ 80%, Grade III ≈ 30%. Jaw location worse than long bones due to resection limits.

§ examKey Examination Points

  • 01Anterior maxilla mass in adult — image with CT & MRI
  • 02Biopsy before definitive surgery

§ revisionQuick Revision Summary

  • 01Cartilage-producing malignancy · wide excision · radioresistant

§ vivaBDS Viva Questions

  • 01Chondrosarcoma vs osteosarcoma?
  • 02What is Garrington sign?
  • 03Role of chemotherapy?

§ mcqsMCQs — Assessment (3)

Question 1

Preferred treatment:

Question 2

Typical calcification pattern:

Question 3

Most common jaw site:

References

  1. WHO Soft Tissue & Bone Tumours 2020

Draft — pending faculty review. Educational use only; verify against current guidelines and primary sources before clinical application.