[A case of tumor-forming chronic pyelonephritis that was difficult to be differentiated from renal cell carcinoma].
We experienced a rare case of tumor-forming type of chronic pyelonephritis that could hardly be differentiated from renal cell carcinoma. A 62-year-old man was admitted to our department with right renal tumor which was discovered when he underwent examination for gastric cancer. Abdominal ultrasound sonography and computed tomography revealed a mass in the middle portion of the right kidney, measuring 3.8 x 3.5 cm in diameter, with irregular surface and isoechoic and isodense inner mass. Renal angiography demonstrated a hypervascular area in the middle portion. Radical nephrectomy and subtotal gastrectomy were performed under a tentative diagnosis of right renal cell carcinoma and early gastric cancer. The excised specimen macroscopically demonstrated a yellowish mass in the middle portion and microscopically revealed many lymphocytes and few neutrophils, macrophages or foam cells. The patient was diagnosed as tumor-forming type of chronic pyelonephritis. Such obvious inflammatory findings very rarely exist in the tumor-forming type of chronic pyelonephritis. Therefore, caution should be exercised in the differential diagnosis between this disease and renal cell carcinoma.
Hatanaka
Y
Y
Department of Urology, Kaizuka City Hospital.
Hanai
T
T
Miyatake
R
R
Katoh
Y
Y
Iguchi
M
M
D002292:Carcinoma, Renal Cell; D002908:Chronic Disease; D003937:Diagnosis, Differential; D005743:Gastrectomy; D006801:Humans; D007680:Kidney Neoplasms; D008297:Male; D008875:Middle Aged; D009392:Nephrectomy; D011704:Pyelonephritis / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D013274:Stomach Neoplasms / Q000150:complications / Q000601:surgery