Glauser S J, Scharling E S, Stovall T G, Zagoria R J
Department of Radiology, Wake Forest University, Bowman Gray School of Medicine, Winston-Salem, North Carolina, USA.
J Ultrasound Med. 1995 Jun;14(6):411-4. doi: 10.7863/jum.1995.14.6.411.
Norplant is a levonorgestrel-containing contraceptive system that consists of six small capsules (2.4 x 34 mm), which are placed subdermally. Owing to the relative newness of this contraceptive modality, problems with removal of the Norplant implants are just beginning to be reported; these consist primarily of inability to locate and remove all six implant capsules upon discontinuation. Ultrasonographic images of 14 women with the Norplant system in place were obtained in the axial and longitudinal planes. On axial view the capsules consisted of discrete circular individual areas of high echogenicity with prominent posterior shadowing. Capsules scanned in a longitudinal plane demonstrated echogenicity of the superior and inferior capsular walls, giving a tubular appearance. It was possible to demonstrate the depth of capsule placement, spatial relation to surrounding capsules, and orientation in relation to the skin surface. Ultrasonography therefore may provide a useful, noninvasive method for localization of nonpalpable Norplant implants, thus facilitating removal.
诺普兰是一种含左炔诺孕酮的避孕系统，由六个小胶囊（2.4×34毫米）组成，皮下植入。由于这种避孕方式相对较新，关于取出诺普兰植入物的问题才刚刚开始有报道；这些问题主要包括在停药时无法找到并取出所有六个植入胶囊。对14名植入诺普兰系统的女性进行了轴向和纵向平面的超声图像检查。在轴向上，胶囊表现为离散的圆形高回声区域，后方伴有明显声影。在纵向上扫描的胶囊显示出上下囊壁的回声，呈管状外观。可以显示胶囊的植入深度、与周围胶囊的空间关系以及与皮肤表面的方位。因此，超声检查可能为定位无法触及的诺普兰植入物提供一种有用的非侵入性方法，从而便于取出。
