PMC8060981_01
Ultrasound showed a patchy hypoechoic area (red arrow) within the right renal sinus, with slightly irregular shape, clear boundary, the similar echo of renal cortex, and enhanced echo in the rear.
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Incidentally, a 33-year-old man was diagnosed as hypertrophied column of Bertin by ultrasound, which demonstrated abnormal echo mass in renal sinus (Figure 1).
Axial precontrast (a) and contrast-enhanced (b and c) CT showed oval solid mass (red arrows) in right renal sinus with identical density and enhancement pattern to adjacent normal renal cortex. In pyelographic phase image (d) exhibited the small renal pelvis (red arrow) from the pseudo-mass merging into the right renal pelvis.
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Plain CT demonstrated an isodensity mass to normal renal parenchyma with unclear boundary in his right renal sinus without hydronephrosis (Figure 2a). Renal contrast-enhanced CT (CECT) showed the intrarenal sinus mass that exhibited the enhancement mode similar to kidney: wheel-spoke shaped enhancement of renal cortex and no enhancement of renal medulla in corticomedullary phase, and homogeneous enhancement in parenchymal phase (Figure 2b and c). Pyelographic phase images demonstrated that a renal pelvis shaped structure from mass merged into the right major renal calyces (Figure 2d).
Pyelographic phase coronary MIP (a) and CPR (b) images demonstrated that the little renal pelvis (yellow arrow) from renal shaped mass in the renal sinus drained into the calyces of the upper pole of right kidney (red arrow). MIP = maximum intensity projection; CPR = curved planar reconstruction.
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Coronal maximum intensity projection (MIP) CT image in pyelographic phase directly revealed that the mass in renal sinus sent out a renal pelvis shaped structure and merged into the right upper major calyces (Figure 3a). The curved planar reconstruction (CPR) image could display the aberrant duplex kidney and renal pelvis in renal sinuses and the confluence into the right upper renal calices in one plane (Figure 3b).