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当科における前立腺癌30例,非前立腺癌20例,計50例を対象に,body coilによる骨盤MRIでの前立腺癌診断能を直腸診,経直腸超音波と比較しながら評価した。MRIの正診率は76%,経直腸超音波(TRUS)は72%で両者の前立腺癌の診断能はほぼ同等であった。また,前立腺癌病巣におけるMRIの所見は局所的な低信号部分を示す典型例は少数であり,内部構造の変化を認める場合が多かった。MRIは,癌の存在についてTRUSと同等の診断効率を望める一方,総合的に局所,骨盤腔全体を評価できる利点を有し,前立腺癌診断に有用と考えられる。
Magnetic resonance imaging (MRI) plays an important role in the diagnosis of prostate cancer. However, some difficulties still exist. We retrospectively studied the pathohistological accuracy of MRI, comparing with that of transrectal ultrasonography (TRUS). We used AIRIS® on a 0.3 tesla MRI unit with a body coil. 50 cases (prostate cancer:30, BPH: 20) histologically diagnoed by sextant biopsy were studied. The accuracy of clinical diagnosis in MRI and TRUS were 76% and 72%,respectively. There is no significant difference.
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