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Transrectal Ultrasonography of the Seminal Vesicles in Asymptomatic Adults
無症狀成年人之儲精囊在經直腸超音波下之表現
摘要
近來經直腸超音波檢查已漸被應用於偵測儲精囊的病變。不過，國內尚無有關以經直腸超音波觀測正常儲精囊的報告。本文收集43位臨床症狀及病灶與儲精囊無關之成年男性病患，以經直腸超音波檢查觀測其儲精囊，輸精管及射精管的超音波形態及主要量徑。儲精囊在經直腸超音波下有100%的呈示率，而輸精管則為81%。大多數(56%)儲精囊的回音強度介乎正常攝護腺之內區與外區之問。輸精管的回音強度則接近或者稍低於儲精囊。儲精囊的超音波解剖形態亦清晰可見，在40%受檢者可發現其內含有小囊狀結構。射精管為一低回音結構，且只能在33%之受檢者觀察到。儲精囊的最大前後徑分別是：右側0.6-1.5公分（平均值±標準差，1.08±0.26公分），左側0.5-2.2公分（平均1.15±0.34公分），兩側平均1.11±0.31公分。輸精管的前後徑為0.30-0.80公分（平均0.54±0.14公分）。 經直腸超音波對儲精囊的檢查為非侵襲性，經濟便捷，且具高度呈示率與極佳的清晰程度，我們認為值得推薦為檢查儲精囊的例行工具。
並列摘要
Transrectal ultrasonography (TRUS) has been used in detection of seminal vesicle pathology recently. However, no report concerning the normal morphology of seminal vesicles on TRUS has been published in Taiwan. We widely used TRUS for evaluating the pelvic disease during the past year. Among the patients examined, 43 cases having symptoms and pathology not related to seminal vesicles were chosen for observation and measurement. The dimensions and echogenicity of the seminal vesicles, presence of seminal vesicle cysts, and the visibility, dimension, and echogenicity of the vas deferens were recorded. The visibility of the seminal vesicles was 100%, and the vas deferens 81%. Most of the seminal vesicles (56%) had echogenicity between that of the Inner and outer zone of normal prostate. The echogenicity of the vas deferens was always equal to or slightly less than that of the seminal vesieles. In 40% of the patients, cyst-like structures were found in the seminal vesicles. The ejaculatory duct was seen as a hypoechoic structure and visible in only 33% (14/43) of patients. The greatest anteroposterior (AP) diameters of the seminal vesicles ranged from 0.6 to 1.5 cm for the right side (mean value 1± SD, 1.08 ±0.26 cm) and from 0.5 to 2.2 cm for the left side (1.15 ±0.34 cm). The overall mean value of seminal vesicles was 1.11 ±0.31 cm. The AP diameter of the vas deferens was 0.54 ±0.14 cm (range, 0.30 - 0.80 cm). TRUS is a noninvasive and cost-effective imaging modality. It can provide high visualization rate and excellent delineation of anatomical details of the seminal vesicles. We therefore recommend TRUS as a routine examination for investigation of the seminal vesicles.