Helical CT of renal masses: the value of delayed scans.

Helical CT of renal masses: the value of delayed scans. Research Abstract Details 

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Helical CT of renal masses: the value of delayed scans. Abstract Text:

R K Zeman,A Zeiberg,W S Hayes,P M Silverman,C Cooper,B S Garra,

OBJECTIVE: Routine scanning techniques used for helical CT of the abdomen result in dense cortical opacification of the kidney, whereas the medulla and collecting system are not well opacified, which potentially compromises detection of renal masses. The purpose of this retrospective study was to determine if additional delayed views (taken approximately 2-4 min after the start of injection of contrast material) are necessary for the detection and characterization of renal masses. MATERIALS AND METHODS: Early (60-70 sec after the start of the injection of contrast material) and delayed scans of 40 patients with suspected renal masses were blindly evaluated by two observers. The patients harbored a total of 187 renal masses (including 62 solid masses). Each region of the kidney (upper, middle, and lower pole) was scored for the presence of a mass. Scoring was done as a binary decision and also as a five-point confidence score for receiver operating characteristic analysis. RESULTS: We found 97 regions that contained renal masses and 114 regions that did not. Receiver operating characteristic analysis revealed the observers to have significantly greater confidence in detection of renal masses on the delayed scans. The binary data showed the two observers to have a sensitivity of 97% for delayed scans versus 77% (p = .0002) and 89% (p = .027), respectively, for the early scans. For the first observer, early and delayed scans were of equal specificity, but for the second observer, the delayed scans yielded greater specificity (94% versus 85%, p = .024). On the early scans, both observers were significantly more likely to miss a neoplastic lesion than a nonneoplastic lesion. The less experienced of the two observers also tended to have greater difficulty in characterizing the lesions on the early scans. CONCLUSION: Because of the significant risk of missing a renal mass, especially a neoplasm, on early cortical-phase scans, additional delayed scans appear justified when a renal mass is suspected on the basis of other imaging tests or clinical history.

Helical CT of renal masses: the value of delayed scans. Publishing Authors By Initials

RK Zeman,A Zeiberg,WS Hayes,PM Silverman,C Cooper,BS Garra,

For similar tomography, x-ray computed research abstracts see: tomography, x-ray computed research

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Helical CT of renal masses: the value of delayed scans. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: AJR. American journal of roentgenology

VOLUME: 167

Page Numbers: 771-6

Journal Abbreviation:

ISSN: 0361-803X

DAY: 15

MONTH: Sep

YEAR: 1996

Helical CT of renal masses: the value of delayed scans. Information

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LANGUAGE: eng

NlmUniqueID: 7708173

Helical CT of renal masses: the value of delayed scans. Keywords Mesh Terms:

KEYWORDS: Tomography, X-Ray Computed

MESH TERMS: methods

Chemical & Substance for Abstract: Helical CT of renal masses: the value of delayed scans. Information

Substance Name: Iohexol

Registry Number: 66108-95-0

Grant and Affiliation Information for Helical CT of renal masses: the value of delayed scans.

AFFILIATION: Department of Radiology, Georgetown University Medical Center, Washington, DC 20007, USA.

Country: UNITED STATES

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MEDLINETA: AJR Am J Roentgenol

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