Table 2.

List of paraspinal soft tissue tumours with possible bone involvement

Condition	Description of bone change
Soft tissue tumours
Benign
BPNST	Geographic with sclerotic margin or indistinct borders, foramen enlargement
Leiomyoma	Geographic indistinct borders
Myxoma	Geographic indistinct borders
Locally aggressive
Solitary fibrous tumour	Geographic indistinct borders
Malignant
MPNST	Geographic indistinct borders or moth-eaten lysis
Liposarcoma	Moth-eaten lysis
Leiomyosarcoma	Moth-eaten lysis
Synovial sarcoma	Moth-eaten or geographic with sclerotic margin; periosteal reaction
Tumours mimics
Trauma	Fracture, luxation
Infection	Erosion of vertebral body endplates and disc space narrowing
HEM	Diffuse changes: sclerotic with areas of lucency, vertebral deformity (fish mouth, H-shaped)
Crystal deposition disease	Erosion with sclerotic margin, other affected joints
Degenerative	Vertebral narrowing, approximation of adjacent spinous processes, facet joint hypertrophy, sclerosis, osteophytes