PMC9830077_01
CT image of the abdominal mass shows a heterogeneous tumor associated with cesarean section scar: plain scan (A) and contrast enhancement (B). (A) Plain scan showed a lobulated cystic mass at the previous cesarean section scar. (B) The solid components showed mild enhancement after contrast.
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It measured around 12.8cm x 7.7cm along the major transverse, anteroposterior and longitudinal axes, respectively (Figures 1 and 2), without any abnormalities in the abdominal cavity.  
The MRI show the extensive lobulated cystic components of the mass with low signal on T1WI (A) and high signal intensity on T2WI (B-D). Axial post-contrast image showed the solid septal component was significantly enhanced.
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It measured around 12.8cm x 7.7cm along the major transverse, anteroposterior and longitudinal axes, respectively (Figures 1 and 2), without any abnormalities in the abdominal cavity.  
Histologically, Hematoxylin and eosin stain, magnificationx200 shows typical clear-cell carcinoma with typical tubulocystic and papillary architectures.
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A punch biopsy of the mass showed CCC, without benign endometriosis presented (Figure 3) (Immunophenotype: CK+, CK7+, CK20-, CD99-, HNF1b+, Napsin A (+)).