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case_images: Confirmatory referral kidney ultrasound by radiology in sepia tone demonstrating hypoechoic 5.2 cm retroperitoneal lesions likely representing extramedullary plasmacytomas compressing the proximal ureter. Left: right kidney long axis. Right: right kidney short axis.
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case_images: Kidney ultrasound revealed enlarged kidneys bilaterally with bilateral hydronephrosis. (Video S4-6 and Figure 1-4). 
case_images: Doppler imaging of right kidney, long axis demonstrating absence of flow in the dilated renal pelvis, proximal ureter, and masses in the retroperitoneum at the inferior pole.
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case_images: Kidney ultrasound revealed enlarged kidneys bilaterally with bilateral hydronephrosis. (Video S4-6 and Figure 1-4). 
case_images: Figure 3. Referral kidney ultrasound of left kidney in long axis demonstrating suspected plasmacytomas 3.7 cm in maximum diameter at the inferior pole. Left: left kidney long axis. Right: left kidney short axis.
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case_images: Kidney ultrasound revealed enlarged kidneys bilaterally with bilateral hydronephrosis. (Video S4-6 and Figure 1-4). 
case_images: Doppler imaging of left kidney in long axis demonstrating lack of fast flow in the area of suspected plasmacytomas.
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case_images: Kidney ultrasound revealed enlarged kidneys bilaterally with bilateral hydronephrosis. (Video S4-6 and Figure 1-4). 
case_images: Computed tomography, coronal view in the abdomen demonstrating interval placement of bilateral percutaneous nephrostomies. On the left the plasmacytomas measure 5.3 cm in maximum diameter.
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case_images: Ultimately repeat computed tomography demonstrated interval increase in size of retroperitoneal extramedullary plasmacytomas (Figure 5, 6).
case_images: Computed tomography, coronal view in the abdomen demonstrating bilateral kidneys with nephrostomies in place and bulky plasmacytomas at inferomedial border of kidneys bilaterally.
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case_images: Ultimately repeat computed tomography demonstrated interval increase in size of retroperitoneal extramedullary plasmacytomas (Figure 5, 6).