Extraskeletal chondrosarcoma

Case contributed by Matt Skalski
Diagnosis almost certain


Progressing posterior thigh pain and mass.

Patient Data

Age: 35
Gender: Female

There is a large lobulated mass within the distal gluteus maximus near its insertion on the linea aspera, which invades the vastis lateralis and abuts the sciatic neurovascular bundle. This mass demonstrates predominately low T1 signal which is isointense to muscle and hyperintense on STIR, with scattered areas of fat signal. There is avid post-contrast enhancement of the lesion. No peri-tumoral edema is appreciated. 

Nuclear medicine

Hypermetabolic multilobulated soft tissue mass within the left thigh which abuts the posterolateral femur and involves all three compartments of the thigh including the anterior, posterior, and medial compartments, and measures up to 9.3 cm in maximum dimension. There is no evidence of marrow or osseous involvement. 

Case Discussion

Case of pathologically proven extraskeletal chondrosarcoma


Case courtesy of Dr. George Matcuk. 

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.