Chondrosarcoma
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Chondrosarcoma is a malignant tumour of cartilage. It is in the chondro-osseous grouping of tumours and can be lumped into the much large category of the soft tissue lesions.
General
- Usually a good prognosis.
Clinical/epidemiologic features:[1]
- Usually arise in a (benign) abnormality of cartilage (e.g. osteochondroma, enchondroma).
- May be associated with a syndrome:
- Olier disease (multiple enchondromatosis).
- Maffucci syndrome (multiple enchondromas and hemangiomas).
Notes:
- Review article (from oncology perspective): PMID 17545802.
Subtypes
Several subtypes exist:
- Chondrosarcoma not otherwise specified (NOS).
- Juxtacortical chondrosarcoma.
- Myxoid chondrosarcoma.
- Mesenchymal chondrosarcoma.
- Clear cell chondrosarcoma.
- Dedifferentiated chondrosarcoma.
Microscopic
- "Abnormal cartilage":
- +/-Nuclear atypia - high grade lesions.
- High grade lesions:
- Nuclear clearing.
- Nucleoli.
- Hyperchromasia.
- Low/intermediate grade lesions:
- Bi-nucleation.
- Hypochromatic enlarged nuclei.
- Infiltration of lamellar bone ("invasion") - not common - diagnostic.
- High grade lesions:
- Increased cellularity.
- More cellular than cartilage... but relatively paucicellular compared to other sarcomas.
- Irregular spacing of chondrocytes.
- +/-Nuclear atypia - high grade lesions.
Notes:
- Low grade chondrosarcoma are not cytologically malignant; the diagnosis rests mostly on radiologic findings.
- The exception is infiltration of lamellar bone -- this is diagnostic of chondrosarcoma.[4]
DDx:
- Chordoma.
- Enchondroma.
- Synovial chondromatosis.
- Osteosarcoma - esp. chondroblastic osteosarcoma - has osteoid, may be focal.
Images
Chondrosarcoma - low mag. (WC)
Chondrosarcoma - high mag. (WC)
Chondrosarcoma - high mag. (WC)
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Variants
Mesenchymal chondrosarcoma
- Arise in soft tissue; this is where the name comes from.[6]
- Rare variant of chondrosarcoma.
Microscopic: Features:
- "White clouds in a blue sky".
Image:
Myxoid chondrosarcoma
Microscopic: Features:
DDx:
Extraskeletal myxoid chondrosarcoma
- Originally thought to be a variant of myxoid chondrosarcoma of bone; however, may not be a chondrosarcoma at all.[8]
- Characteristic chromosomal translocation: t(9;22) CHN-EWS.
DDx:
- Chordoma.[8]
- S-100 +ve (strong).
- EMA +ve.
Image:
Dedifferentiated chondrosarcoma
Clinical:
- Abysmal to poor prognosis.
Features:[11]
- Poorly differentiated (mesenchymal) malignancy.
- Well-differentiated cartilaginous component.
DDx:
- Undifferentiated pleomorphic sarcoma - no cartilaginous component.
- Other dedifferentiated tumours, e.g. dedifferentiated liposarcoma, with a minimal differentiated component.
Images:
Grading
Features:[12]
- Grade I: mild-to-moderate increase of cellularity +/- binucleated cells.
- Grade II: between Grade I and Grade III.
- Grade III: nuclear pleomorphism, mitoses common.
IHC
- S-100 -ve. (???)
See also
References
- ↑ Skubitz KM, D'Adamo DR (November 2007). "Sarcoma". Mayo Clin. Proc. 82 (11): 1409–32. PMID 17976362. http://www.mayoclinicproceedings.com/content/82/11/1409.long.
- ↑ IAV. 26 February 2009.
- ↑ Klatt, Edward C. (2006). Robbins and Cotran Atlas of Pathology (1st ed.). Saunders. pp. 417. ISBN 978-1416002741.
- ↑ Dickson, B. 28 April 2011.
- ↑ URL: http://www.path.utah.edu/casepath/ms%20cases/MSCase6/MSCase6Part3.htm. Accessed on: 29 December 2013.
- ↑ Dowling EA (June 1964). "Mesenchymal chondrosarcoma". J Bone Joint Surg Am 46: 747–54. PMID 14161087. http://www.ejbjs.org/cgi/reprint/46/4/747.pdf.
- ↑ Fisher C (May 2000). "Parachordoma exists--but what is it?". Adv Anat Pathol 7 (3): 141–8. PMID 10809219.
- ↑ 8.0 8.1 Aigner, T.; Oliveira, AM.; Nascimento, AG. (Feb 2004). "Extraskeletal myxoid chondrosarcomas do not show a chondrocytic phenotype.". Mod Pathol 17 (2): 214-21. doi:10.1038/modpathol.3800036. PMID 14657948.
- ↑ URL: http://www.cttr.org/cms/?p=736. Accessed on: 1 May 2011.
- ↑ Mitchell, AD.; Ayoub, K.; Mangham, DC.; Grimer, RJ.; Carter, SR.; Tillman, RM. (Jan 2000). "Experience in the treatment of dedifferentiated chondrosarcoma.". J Bone Joint Surg Br 82 (1): 55-61. PMID 10697315.
- ↑ 11.0 11.1 Sopta, J.; Dordević, A.; Tulić, G.; Mijucić, V. (Feb 2008). "Dedifferentiated chondrosarcoma: our clinico-pathological experience and dilemmas in 25 cases.". J Cancer Res Clin Oncol 134 (2): 147-52. doi:10.1007/s00432-007-0262-5. PMID 17653766.
- ↑ Humphrey, Peter A; Dehner, Louis P; Pfeifer, John D (2008). The Washington Manual of Surgical Pathology (1st ed.). Lippincott Williams & Wilkins. pp. 643. ISBN 978-0781765275.