Abstract
Objectives
To report a case of motor weakness caused by the increasing size of a sacroiliac joint cyst after spinal fusion.
Summary of Literature Review
There have been no reports on the increased size of a sacroiliac joint cyst and motor weakness after spinal fusion.
Materials and Methods
A 63-year-old female was admitted with low back pain and right sciatica. Magnetic resonance imaging (MRI) findings showed the spinal canal narrowing at L4–5 and a cystic lesion on the right sacroiliac joint. After surgery, the symptoms were relieved.
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Fig. 1.
Initial magnetic resonance imaging (MRI) reveals spinal stenosis at L4–5 in the sagittal (A) and the axial (B) images, and a cystic lesion measuring 1.6 cm×1.0 cm at the inferior surface of the right sacroiliac joint in the coronal (C) image.
![jkss-22-178f1.tif](/upload/SynapseXML/1089jkss/thumb/jkss-22-178f1.gif)
Fig. 2.
Posterior decompression and posterior lumbar interbody fusion with a cage was performed at L4–5 (A, B).
![jkss-22-178f2.tif](/upload/SynapseXML/1089jkss/thumb/jkss-22-178f2.gif)