Sacral Insufficiency Fracture after Radiotherapy for Cervical Cancer: Appearance and Dynamic Changes on 18F-Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography

Table 2

Imaging features of the 38 patients with SIF.

Sacral involvement
Left	17 (44.7%)
Right	8 (21.%)
Double	13 (34.2%)
CT density
Increased	35 (92.1%)
Unchanged	3 (7.9%)
Decreased	0 (0%)
Sacral manifestation
Abnormal (cortical folds or fracture lines)	28 (73.7%)
Normal	10 (26.3)
Metabolism (SUVmax)
Range	1.8–5.9
Average	3.1
Metabolic pattern
Diffuse or linear	37 (97.3%)
Focal	1 (2.7%)

SIF, sacral insufficiency fracture; SUVmax, maximum standardized uptake value.