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

¹秋田大学医学部第一内科, ²秋田大学医学部泌尿器科

¹The First Department of Internal Medicine, Akita University School of Medicine, ²Department of Urology, Akita University School of Medicine

キーワード : 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.