PMC7704358_01
MRI: (A) (B) Axial t1-weighted image without and with gadolinium showing Extradural mass with thin rim of enhancement and no internal enhancement. The spinal cord is completely compressed to the left side. (C) Axial T2-weighted image showing the high hypointense posterolateral mass which seems adherent to ligamentum flavum and fact joint. (D) Sagittal T2-weighted image showing hypointense mass causing posterolateral spinal cord compression in C7-T1.
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Postcontrast (Gadolinium) with fat saturation, T1-weighted axial images showed a thin rim of enhancement, and no internal enhancement (Fig. 1).
Per operative view after C7 and D1 laminectomy showing a yellowish lesion with a dark red content situated postero-laterally and adjacent to the facet joint and which adheres to the spinal cord.
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C7-T1. Cyst content was dark red and gelatinous like old bleeding (Fig. 2).
Histology: (A) Hemorrhagic Synovial cyst. H&E. The cyst wall is disrupted by hemorrhage and fibrin deposits (B) Hemorrhagic Synovial cyst. H&E. Large vessels with fibrin deposits in the cyst wall.
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These findings were consistent with the diagnosis of hemorrhagic synovial cyst (Fig. 3).