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Contrast‐Enhanced Ultrasonography in the Diagnosis of Solid Renal Tumors
Author(s) -
Tamai Hideyuki,
Takiguchi Yoshie,
Oka Masashi,
Shingaki Naoki,
Enomoto Shotaro,
Shiraki Tatsuya,
Furuta Machi,
Inoue Izumi,
Iguchi Mikitaka,
Yanaoka Kimihiko,
Arii Kenji,
Shimizu Yasuhito,
Nakata Hiroya,
Shinka Toshiaki,
Sanke Tokio,
Ichinose Masao
Publication year - 2005
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.2005.24.12.1635
Subject(s) - medicine , hypervascularity , radiology , malignancy , renal cell carcinoma , angiomyolipoma , kidney , pathology
Objective The purpose of this study was to evaluate the usefulness of contrast‐enhanced ultrasonography (CEUS) in the diagnosis of solid renal tumors. Methods Twenty‐nine patients with solid tumors detected on gray scale ultrasonography underwent resection for suspected renal malignancy. Findings of arterial phase contrast computed tomography (CT) and CEUS were compared for each diagnosis. Results Histopathologic examination of resected lesions showed malignancy in 26 patients (clear cell carcinoma, n = 18; papillary renal cell carcinoma, n = 6; collecting duct carcinoma, n = 1; and infiltrative urothelial carcinoma, n = 1) and benign tumors in 3 patients (oncocytoma, n = 2; and angiomyolipoma, n = 1). Contrast CT failed to show tumor blood flow in 5 of 29 patients, whereas CEUS showed this in all patients. Positive predictive values of CEUS and contrast CT in the diagnosis of renal malignancy were 100% and 82.8%, respectively. Among clear cell carcinomas, hypervascularity was observed on contrast CT in 16 of 18 patients and on CEUS in 17 of 18 patients. On the basis of hypervascularity, diagnostic sensitivity values for clear cell carcinoma were 94.4% for CEUS and 88.9% for contrast CT, whereas specificity values were 45.5% for CEUS and 72.7% for contrast CT. Among papillary cell carcinomas, contrast CT showed avascular lesions in 4 of 6 patients. However, CEUS showed blood flow in these lesions, leading to diagnosis of hypovascular renal tumors. Conclusions Contrast‐enhanced ultrasonography was more sensitive for detecting slight tumor blood flow than contrast CT and was useful in preoperatively diagnosing malignant hypovascular renal tumors but was less so for hypervascular renal tumors.