Korean J Radiol.  2000 Dec;1(4):219-222. 10.3348/kjr.2000.1.4.219.

Radiologic Findings of Renal Inflammatory Pseudotumor: A Case Report

• Kim TJ
• Kim SH

• KMID: 1378949
• DOI: http://doi.org/10.3348/kjr.2000.1.4.219

Abstract

Renal inflammatory pseudotumor is a very rare benign condition of unknown etiology characterized by proliferative myofibroblasts, fibroblasts, histiocytes, and plasma cells. In the case we report, the lesion appeared on contrast-enhanced power Doppler US images as a well-defined hypoechoic mass with intratumoral vascularity, and on CT as a low-attenuated mass. Differentiation from malignant renal neoplasms was not possible.

Keyword

Kidney, neoplasms; Ultrasound (US)

MeSH Terms

Case Report
Contrast Media
Granuloma, Plasma Cell/*radiography/*ultrasonography
Human
Kidney Diseases/*radiography/*ultrasonography
Male
Middle Age
Polysaccharides/diagnostic use
Ultrasonography, Doppler

Figure

• 

  Fig. 1 A 60-year-old man with gross hematuria first noted ten days earlier. A. Delayed enhanced CT image shows a well-circumscribed, right renal mass (arrow) involving the lower pole calyx. Areas of low attenuation (arrowheads) are present in adjacent renal parenchyma. B. Retrograde pyelography revealed a dilated lower pole calyx with irregular filling defect (arrow). C. Gray-scale US demonstrated a round, homogeneously hypoechoic lesion, 1.6 cm in diameter, at the lower pole of the right kidney (not shown). Unenhanced power Doppler US revealed no definite tumoral vascularity. D. Harmonic power Doppler US image obtained 150 seconds after the injection of contrast agent shows dot-like, linear power Doppler US signals within the mass (arrow). These were not depicted by unenhanced power Doppler US (C). E. Conventional power Doppler US image obtained 7 minutes after injection also shows dot-like, linear power Doppler US signals. Compared with harmonic power Doppler US, severe blooming artifacts around and within the kidney are noted (curved arrows). F. Photomicrograph of a histologic specimen shows marked proliferation of myofibroblasts and capillaries with infiltration of lymphocytes, plasma cells and macrophages. Mitotic activity was low, and cellular atypism was minimal.

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