Fox Michael G, Balin Jefferson I, Stephens Tausha, Patrie James T, Brant William E, de Lange Eduard E
From the *Department of Radiology and Medical Imaging, University of Virginia Health System; †Department of Radiology, University of Virginia Health System, Durham VA Medical Center; and ‡Department of Public Health Sciences, University of Virginia Health System, Charlottesville, VA.
J Comput Assist Tomogr. 2014 Nov-Dec;38(6):869-73. doi: 10.1097/RCT.0000000000000124.
Determine the incidence and amount of isolated pelvic fluid in males, stratified by age, on outpatient pelvic magnetic resonance imaging (MRI) examinations performed for lower back or extremity pain.
After institutional review board approval, 161 pelvic MRIs performed on males for musculoskeletal or neurologic indications over an 18-month period were retrospectively reviewed for isolated pelvic fluid by 2 radiologists. Patients with a potential etiology for the fluid were excluded. Volume and maximal 2-dimensional measurements of fluid were calculated. Statistical analysis included logistic regression, Wilcoxon rank-sum, and χ tests.
Twenty (44.4%) of 45 patients 5 to 29 years old, 5 (10%) of 50 patients 30 to 49 years old, and 4 (6.1%) of 66 patients older than 50 years had isolated pelvic fluid (P < 0.001). Mean volume of fluid was 2.5 mL; 97% (28/29) had less than 10 mL. Mean maximal 2-dimensional measurement was 2.1 cm; 93% (27/29) had less than 6 cm(2).
Isolated fluid is greater than 7 times more common on outpatient pelvic MRIs in males younger than 30 years compared with men older than 49 years. Fluid rarely exceeded 10 mL or 6 cm(2).
确定因下背部或肢体疼痛接受门诊盆腔磁共振成像（MRI）检查的男性患者中，孤立盆腔积液的发生率及积液量，并按年龄分层。
经机构审查委员会批准，对18个月内161例因肌肉骨骼或神经适应症接受盆腔MRI检查的男性患者进行回顾性研究，由2名放射科医生评估是否存在孤立盆腔积液。排除有潜在积液病因的患者。计算积液的体积和最大二维测量值。统计分析包括逻辑回归、Wilcoxon秩和检验及χ检验。
45例5至29岁患者中有20例（44.4%）、50例30至49岁患者中有5例（10%）、66例50岁以上患者中有4例（6.1%）存在孤立盆腔积液（P < 0.001）。积液平均体积为2.5 mL；97%（28/29）的积液量小于10 mL。最大二维测量平均值为2.1 cm；93%（27/29）的测量值小于6 cm²。
与49岁以上男性相比，30岁以下男性门诊盆腔MRI检查中孤立盆腔积液的发生率高出7倍多。积液很少超过10 mL或6 cm²。
