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Unusual appearance of retroperitoneal fibrosis simulating a tumour

Departments of ¹ Radiology, ²Surgery and ³Pathology, All India Institute of Medical Sciences, New Delhi, India

View larger version (105K): [in a new window]   Figure 1. Non-contrast CT of the abdomen shows a well-defined hypodense retroperitoneal mass (M) with foci of calcification (arrow), located anterior to the right psoas muscle.

View larger version (130K): [in a new window]   Figure 2. (a) Gradient echo (GRE) T1 weighted axial image shows a hypointense mass (M) in the right paracaval location. (b) GRE fat saturated T2 weighted axial image shows that the mass (M) is predominantly hypointense with few hyperintense foci in the periphery. (c) Tru-FISP coronal T2 weighted scan shows that the mass (M) is intimately related to right kidney (K) and is encasing the right ureter and compressing the inferior vena cava (IVC). (d) GRE post-contrast T1 weighted coronal scan shows an enhancing mass (M) abutting the right kidney (K) causing upstream hydronephrosis.