Hemorrhagic lumbar synovial facet cyst secondary to transforaminal epidural injection: A case report and review of the literature

Figure 1 T2 weighted midsagittal (A) and axial (B) magnetic resonance imaging scan showed intraspinal extradural well delineated capsule containing a mixed signal intensity lesion on the left side at L5-S1 causing server canal stenosis with displacement of the thecal sac to the right side.

Figure 2 T1 weighted midsagittal (A) and axial (B) magnetic resonance imaging scan showed increased signal intensity with layering areas suggesting different stages of hematoma formation.

Figure 3 Intraoperative photograph taken by the surgical microscope showed a well-demarked brown color cyst that was adherent to the thecal sac (arrow), a hematoma was found inside the cyst.

Figure 4 Intraoperative photograph taken by the surgical microscope showed hematoma inside the cyst (arrow).

Figure 5 Postoperative anteroposterior and lateral roentgenograms showed L3-S1 instrumentation and posterolateral fusion.