MRI of the spine was performed to assess the spinal cord and canal, and again demonstrates the complex heterogeneous large lobulated mass with central calcification/ossification possibly arising from the left side 3rd rib and its costovertebral junction. The mass demonstrates high T2 and intermediate T1 signal intensity with peripheral enhancement on the post contrast administration images. There is extension to the left foramen of T3 vertebra with foraminal widening and minimal extension into the left lateral epidural space. There is left side T3 vertebral lateral element involving by the lesion. There is spacious bony spinal canal and thecal sac and no appreciable spinal cord compromise.
The appearance of the lesion with central calcification-ossification and the signal characteristic is most consistent with chondrosarcoma.