Mi-Hyun Kim, Presenter: Nothing to Disclose

Jeong Kon Kim MD, Abstract Co-Author: Nothing to Disclose

Myung-Won You MD, Abstract Co-Author: Nothing to Disclose

Hyuck Jae Choi MD, Abstract Co-Author: Nothing to Disclose

Kyoung-Sik Cho MD, Abstract Co-Author: Nothing to Disclose

To compare the diagnostic rate and complication between standard-dose and low-dose protocol group in the CT-guided biopsy for the entirely endophytic small renal masses (SRM)

A total of 56 patients underwent CT-guided biopsy for the entirely endophytic SRM (≤ 4 cm) from May 2011 to March 2014. Biopsy was performed with standard-dose protocol (reference mAs, 210) in 37 patients and low-dose protocol (reference mAs range, 40-80; mean±standard deviation, 43±9.5) in 19 patients. The diagnostic rate, histologic finding, radiation dose, complication rate, and procedure time were assessed from the retrospective chart and image reviews and compared between two groups.

In the low-dose protocol group, all 19 patients had diagnostic results (14 renal cell carcinomas, 2 metastases, 1 urothelial carcinoma, 1 oncocytic neoplasm, and 1 angiomyolipoma). In the standard-dose protocol group, 36 (97%) patients had diagnostic results (24 renal cell carcinomas, 2 metastases, 1 lymphoma, 4 angiomyolipomas, 4 inflammations, and 1 cyst) and one patient had non-diagnostic result. No serious complication such as active bleeding was occurred in two groups. The standard-dose protocol group had statistically greater value of the dose length product (DLP) than low-dose protocol group (560±221 vs. 180±61 mGy*㎝, P < .05). Mean procedure time was equally 21 minutes in two groups.

Low-dose protocol CT-guided biopsy for the entirely endophytic SRM has comparable diagnostic result to the standard-dose protocol group without increasing complication rate or procedure time.

Endophytic renal tumors have been related to higher surgical complexity and higher postoperative complication rate than exophytic lesions, and the number of biopsies in these endophytic lesions is increasing in our institution. Low dose protocol CT-guided biopsy may be sufficient for the histologic diagnosis of the endophytic SRM and can reduce the radiation dose to the patient.

Kim, M, Kim, J, You, M, Choi, H, Cho, K, CT-guided Biopsy for the Entirely Endophytic Small Renal Mass: Comparison of Diagnostic Rate and Complication between Standard-dose and Low-dose Protocol Group.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14007014.html