Multiple hereditary exostoses with iliac chrondrosarcoma

Case contributed by Michael P Hartung
Diagnosis certain


Pelvic discomfort.

Patient Data

Gender: Male

Multiple pelvic exostoses with a bulky calcified mass in the right ileum. 

Multiple sessile and pedunculated osteochondromas of the pelvis and proximal femora. Large osteochrondroma arising from the right iliac wing with low-attenuation soft tissue mass with finer calcifications extending posteromedially and cranially along the course the psoas.

Case Discussion

This patient developed a symptomatic, partially calcified soft tissue mass at the site of existing osteochondroma, which is concerning for low-grade chondrosarcomatous transformation. This patient eventually underwent right hemipelvectomy with final pathology confirming chondrosarcoma. 

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