Two Cases of Renal Cell Carcinoma with Marked Cystic Degeneration -Role of Color Doppler Sonography in the Diagnosis-
長沼 裕子1, 石田 秀明1, 新澤 真理1, 森川 パブロ1, 石岡 知憲1, 許 力軍1, 正宗 研1, 西澤 理2
Hiroko NAGANUMA1, Hideaki ISHIDA1, Makoto NIIZAWA1, Pablo MORIKAWA1, Tomonori ISHIOKA1, Li Jun XU1, Osamu MASAMUNE1, Osamu NISHIZAWA2
1The First Department of Internal Medicine, Akita University School of Medicine, 2Department of Urology, Akita University School of Medicine
Renal cell carcinoma, Color Doppler, Ultrasound, Kidney
We report two cases of renal cell carcinoma with marked cystic degeneration. Case 1: 58-year-old man. Sonography revealed a cystic mass with partial wall thickening. A markedly increased arterial flow with sudden interruption was shown by color Doppler (F-max (maximum frequency shift) 0.97 KHz, F-min (minimum frequency shift) 0.41 KHz, PI 0.96, RI 0.51.) Case 2: 67-year-old man. Sonography showed a tumor as a whole, with an octagonal appearance. Assisted by color Doppler, many arterial flows were detected in the solid part (F-max 1.08 KHz, 0.55 KHz, F-min 0.60 KHz, 0.25 KHz, PI 0.60, 0.85, RI 0.44, 0.54.) The histology of the two cases showed renal cell carcinoma with cystic degeneration. This disease needs to be differentiated from renal cyst. Color Doppler studies of our two cases suggested hypervasculature of the tumor. US and color Doppler study was useful for diagnosis of renal cell carcinoma with marked cystic degeneration.