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Click 38 year-old man with Gardner syndrome complicated with hydronephrosis. Axial helical CT scan during arterial phase demonstrates a solid mass with inhomogeneous enhancement in the anterior abdominal wall, involving the rectus abdominis muscle, wide up to the pelvis; other masses with similar features are visible in the right iliac fossa and in the mesenteric fat.

Click 38 year-old man with Gardner syndrome complicated with hydronephrosis. Coronal MPR CT scan during arterial phase better shows extension of the anterior abdominal wall mass, involving the rectus abdominis muscle, wide up to the pelvis.

Click 38 year-old man with Gardner syndrome complicated with hydronephrosis. Axial helical CT scan during portal-venous phase does not show significant contrast uptake of lesions described above.

Click 38 year-old man with Gardner syndrome complicated with hydronephrosis. Axial head CT scan shows a lentiform ossified lesion in the frontal bone and multiple exostoses in the skull.

Click 38 year-old man with Gardner syndrome complicated with hydronephrosis. Axial MDCT for staging to evaluate response to chemotherapy demonstrates increase in size of the mesenteric mass and relapse of the anterior abdominal wall mass.

Click 38 year-old man with Gardner syndrome complicated with hydronephrosis. Coronal MPR-MDCT for staging to evaluate response to chemotherapy better shows increase in size of the mesenteric mass compromising the right ureter and causing hydronephrosis with reduced renal cortical enhancement of the right kidney.

Click 38 year-old man with Gardner syndrome complicated with hydronephrosis. Sagittal MPR-MDCT for staging to evaluate response to chemotherapy better demonstrates increase in size of the mesenteric mass causing hydroureteronephrosis.