Effect of the Menstrual Cycle on Background Parenchymal Enhancement in Breast MR Imaging
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概要
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Purpose: We assessed the influence of the menstrual cycle on background parenchymal enhancement (BPE) of the breast in the early and delayed phases of dynamic magnetic resonance (MR) imaging and the optimal timing of MR imaging of the breast in Japanese women. Material and Methods: We reviewed dynamic MR images of 165 consecutive women with regular menstrual cycles and divided the women into 4 groups by week of the menstrual cycle: 32 in Week One (Days 1 through 4 of the menstrual cycle); 46 in Week 2 (Days 5 through 12); 49 in Week 3 (Days 13 through 20); and 38 in Week 4 (Days 21 through 30). We qualitatively evaluated BPE of the whole breast in the early and delayed phases of MR imaging; categorized enhancement as minimal, mild, moderate, or marked; and calculated the rate at which signal intensity increased (=SI post−SI pre/SI pre) in regions of interest in from the early and delayed phase to the before contrast administration phase to assess BPE quantitatively. Results: In both the early and delayed dynamic MR phases, BPE was significantly more extensive and stronger in Week 4 than Week 2 (P<0.01). Throughout the menstrual cycle, BPE was significantly stronger in the delayed phase than in the early phase in both qualitative (Week One, P=0.0002; Weeks 2 through 4, P<0.0001) and quantitative (Weeks One through 4, P<0.0001) assessments. Conclusion: The optimal time to perform dynamic breast MR imaging in premenopausal Japanese women was during Days 5 through 12 of the menstrual cycle.
著者
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Shinkura Nobuhiko
Department Of Surgery Mitsubishi Kyoto Hospital
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Konishi Eiichi
Department Of Cell Biology Research Institute For Neurological Diseases And Geriatrics Kyoto Prefect
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Goto Mariko
Department Of Radiology Graduate School Of Medical Science Kyoto Prefectural University Of Medicine
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KONISHI Eiichi
Department of Pathology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
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KAJIHARA Mariko
Department of Radiology , Kyoto Breast Center, Sawai Memorial Clinic
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HIRAYAMA Yukari
Department of Radiology , Kyoto Breast Center, Sawai Memorial Clinic
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OKUNISHI Shoko
Department of Radiology , Kyoto Breast Center, Sawai Memorial Clinic
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KAOKU Setsuko
Department of Radiology , Kyoto Breast Center, Sawai Memorial Clinic
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