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Radiograph of a hysterosalpingogram revealing a uterine cavity that contains a round filling defect in the midsection of the fundus (possibly an air bubble, polyp or submucosal leiomyoma=fibroid), a normal appearing partially filled fallopian tube on both the right and left side, and no free spillage of dye from either tube. The most common reason for the lack of free spillage of dye on a film like this is that the radiograph was taken early in the study before complete filling of the tubes. The very thin line of tube extending for several centimeters from the uterus is called the isthmus, the wider (tubal) lumenal diameter (distally) marks the beginning of the ampullary section of the fallopian tube, and the distal sections at the end of the tube need to be seen (with spillage if present) for the study to be considered complete and normal.
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