PMC6604497_01
T1-weighted Thoracic spine Magnetic Resonance Imaging showing diffuse extradural mass effect and enhancement from the T1 level to the T5 level anteriorly and to the T7 level posteriorly; most prominent at the T4-T5 level where there is marked spinal canal stenosis and mass effect upon the spinal cord.
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Magnetic resonance imaging (MRI) of the thoracic spine showed T2-diffuse enhancement of extradural soft tissue mass with marked spinal canal stenosis, most prominent at the level of T4-T5 (Figure 1).
Hematoxylin and Eosin (H&E) section of the epidural mass (200x magnification power for (a) and 100x magnification power for (b)) showing (a) chronic inflammatory infiltrates, predominantly mononuclear infiltrate, lymphoid hyperplasia (black arrow) and plasma cells emulating the classic storiform fibrosis pattern; no phlebitis obliterans were identified. (b) Dense collagen deposition and dense fibrous tissue formation (blue arrow) with focal germinal center formation (green arrows).
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T2 through T6 with excisional biopsy of the epidural mass was performed. The histological examination of the extradural mass chronic inflammatory infiltration composed of lymphocytes, plasma cells, histiocytes, neutrophils, eosinophils, mast cells (Figure 2(a)). It also showed dense collagen deposition and fibrous tissue formation with focal germinal center formation (Figure 2(b)).