PMC7374222_01
CT scan abdomen. (a) Initial and (b) follow-up scan 1 year later after discontinuation of etanercept, without systemic steroids.
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fig1
A computed tomography (CT) scan revealed diffuse hyperattenuation throughout the retroperitoneum and mesentery and bilateral mild hydronephrosis, with dilated ureters proximally thought to be due to retroperitoneal fibrosis (Figure 1). Despite this, one year later, his CT scan showed marked improvement in the retroperitoneal mass (Figure 1).
Histopathology of the mass: mesenteric inflammation with fibrosis and lipodystrophy (staining: hematoxylin-eosin; magnification: 20x).
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fig2
A laparoscopic biopsy was performed, which showed nonspecific inflammatory changes without granuloma or neoplastic cells (Figure 2).