Abstract
Background: Accurate preoperative diagnosis of fat scanty angiomyolipomas is an important clinical issue. By evaluating the low signal intensity of angiomyolipomas in MR T2-weighted images the diagnostic accuracy can be elevated. Purpose: To retrospectively assess the usefulness of T2-weighted MR imaging for differentiating low-fat angiomyolipomas (AMLs) from other renal tumors. Material and Methods: We retrospectively evaluated 71 patients with surgically proven renal masses (10 AMLs, 57 renal cell carcinomas [RCCs], and four oncocytomas), all of which showed no visible fat as well as gradual enhancement patterns on contrast-enhanced CT. Signal intensity was measured in each renal mass and in the spleen on T2-weighted images, and each signal intensity ratio (SIR) was calculated; SIR values were then compared in the AML and non-AML groups. Receiver operating characteristic (ROC) analysis was used to evaluate the diagnostic performance of the two parameters for differentiating the two groups. Results: The SIR values (77 +- 24% vs. 162 +- 79%, p = 0.002) were significantly lower in the AML than in the non-AML group. The area under the ROC curve was 0.926 for SIR. The sensitivity and specificity in the diagnosis of AMLs were 90% and 90.2%, using SIR cut-off of 92.5%. Conclusion: Signal intensity
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Choi, Hyuck Jae;
Kim, Jeong Kon;
Kim, Mi-Hyun;
Cho, Kyoung-Sik;
[1]
Ahn, Hanjong;
Kim, Choung-Soo
[2]
- Dept. of Radiology, Asan Medical Center, Univ. of Ulsan (Korea, Republic of)
- Dept. of Urology, Asan Medical Center, Univ. of Ulsan (Korea, Republic of)
Citation Formats
Choi, Hyuck Jae, Kim, Jeong Kon, Kim, Mi-Hyun, Cho, Kyoung-Sik, Ahn, Hanjong, and Kim, Choung-Soo.
Value of T2-weighted MR imaging in differentiating low-fat renal angiomyolipomas from other renal tumors.
Sweden: N. p.,
2011.
Web.
doi:10.1258/AR.2010.090491.
Choi, Hyuck Jae, Kim, Jeong Kon, Kim, Mi-Hyun, Cho, Kyoung-Sik, Ahn, Hanjong, & Kim, Choung-Soo.
Value of T2-weighted MR imaging in differentiating low-fat renal angiomyolipomas from other renal tumors.
Sweden.
https://doi.org/10.1258/AR.2010.090491
Choi, Hyuck Jae, Kim, Jeong Kon, Kim, Mi-Hyun, Cho, Kyoung-Sik, Ahn, Hanjong, and Kim, Choung-Soo.
2011.
"Value of T2-weighted MR imaging in differentiating low-fat renal angiomyolipomas from other renal tumors."
Sweden.
https://doi.org/10.1258/AR.2010.090491.
@misc{etde_1011575,
title = {Value of T2-weighted MR imaging in differentiating low-fat renal angiomyolipomas from other renal tumors}
author = {Choi, Hyuck Jae, Kim, Jeong Kon, Kim, Mi-Hyun, Cho, Kyoung-Sik, Ahn, Hanjong, and Kim, Choung-Soo}
abstractNote = {Background: Accurate preoperative diagnosis of fat scanty angiomyolipomas is an important clinical issue. By evaluating the low signal intensity of angiomyolipomas in MR T2-weighted images the diagnostic accuracy can be elevated. Purpose: To retrospectively assess the usefulness of T2-weighted MR imaging for differentiating low-fat angiomyolipomas (AMLs) from other renal tumors. Material and Methods: We retrospectively evaluated 71 patients with surgically proven renal masses (10 AMLs, 57 renal cell carcinomas [RCCs], and four oncocytomas), all of which showed no visible fat as well as gradual enhancement patterns on contrast-enhanced CT. Signal intensity was measured in each renal mass and in the spleen on T2-weighted images, and each signal intensity ratio (SIR) was calculated; SIR values were then compared in the AML and non-AML groups. Receiver operating characteristic (ROC) analysis was used to evaluate the diagnostic performance of the two parameters for differentiating the two groups. Results: The SIR values (77 +- 24% vs. 162 +- 79%, p = 0.002) were significantly lower in the AML than in the non-AML group. The area under the ROC curve was 0.926 for SIR. The sensitivity and specificity in the diagnosis of AMLs were 90% and 90.2%, using SIR cut-off of 92.5%. Conclusion: Signal intensity measurements on T2-weighted MR images can differentiate AML from non-AML in the kidney}
doi = {10.1258/AR.2010.090491}
journal = []
issue = {3}
volume = {52}
place = {Sweden}
year = {2011}
month = {Apr}
}
title = {Value of T2-weighted MR imaging in differentiating low-fat renal angiomyolipomas from other renal tumors}
author = {Choi, Hyuck Jae, Kim, Jeong Kon, Kim, Mi-Hyun, Cho, Kyoung-Sik, Ahn, Hanjong, and Kim, Choung-Soo}
abstractNote = {Background: Accurate preoperative diagnosis of fat scanty angiomyolipomas is an important clinical issue. By evaluating the low signal intensity of angiomyolipomas in MR T2-weighted images the diagnostic accuracy can be elevated. Purpose: To retrospectively assess the usefulness of T2-weighted MR imaging for differentiating low-fat angiomyolipomas (AMLs) from other renal tumors. Material and Methods: We retrospectively evaluated 71 patients with surgically proven renal masses (10 AMLs, 57 renal cell carcinomas [RCCs], and four oncocytomas), all of which showed no visible fat as well as gradual enhancement patterns on contrast-enhanced CT. Signal intensity was measured in each renal mass and in the spleen on T2-weighted images, and each signal intensity ratio (SIR) was calculated; SIR values were then compared in the AML and non-AML groups. Receiver operating characteristic (ROC) analysis was used to evaluate the diagnostic performance of the two parameters for differentiating the two groups. Results: The SIR values (77 +- 24% vs. 162 +- 79%, p = 0.002) were significantly lower in the AML than in the non-AML group. The area under the ROC curve was 0.926 for SIR. The sensitivity and specificity in the diagnosis of AMLs were 90% and 90.2%, using SIR cut-off of 92.5%. Conclusion: Signal intensity measurements on T2-weighted MR images can differentiate AML from non-AML in the kidney}
doi = {10.1258/AR.2010.090491}
journal = []
issue = {3}
volume = {52}
place = {Sweden}
year = {2011}
month = {Apr}
}