新英格兰杂志临床影像：输精管钙化
    Engl J Med. 2011 May 26;364（21）：2043.
    Images in clinical medicine. Calcified vasa deferentia.
    Banerji JS, Devasia A.
    A 60-year-old man with advanced diabetic nephropathy and secondary
    hyperparathyroidism underwent radiographic imaging of the abdomen
    and pelvis as part of an evaluation for nephrolithiasis. Although no hydronephrosis
    or radiopaque kidney stones were present, bilateral tubular calcification of
    the vasa deferentia was incidentally noted on a plain radiograph （Panel A, arrows）
    and on an axial section of a computed tomographic image of the pelvis, performed
    without the administration of contrast material （Panel B, arrows）。

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