Post irradiation osteosarcoma

Case contributed by Dr J Yeung

Presentation

History of nasopharyngeal carcinoma treated with radiotherapy 10 years ago. Now present with epistaxis, ear pain and discharge.

Patient Data

Gender: Female
CT

Large sclerotic bone lesion at skull base, associated with soft tissue mass.

Case Discussion

A post irradiation osteosarcoma may develop when more than 30Gy is given. There is a latency of more than 3 years after RT, on average 11-14 years. It may mimic osteonecrosis and primary recurrence. Imaging feature of osteosarcoma includes bone forming tumor with soft tissue mass and interval growth. Osteonecrosis on the other hand, usually shows osteopenia and heterogeneous bone density with absence of soft tissue mass. It usually develop 1-3 years after RT and no significant change over time.

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Case information

rID: 14896
Case created: 3rd Sep 2011
Last edited: 18th Dec 2015
Inclusion in quiz mode: Included

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