Here's some info for you:
"Hysteroscopy uses a hysteroscope, which is a thin telescope that is inserted through the cervix into the uterus. Modern hysteroscopes are so thin that they can fit through the cervix with minimal or no dilation. Because the inside of the uterus is a potential cavity, like a collapsed air dome, it is necessary to fill (distend) it with either a liquid or a gas (carbon dioxide) in order to see. Diagnostic hysteroscopy and simple operative hysteroscopy can usually be done in an office setting. More complex operative hysteroscopy procedures are done in an operating room setting."
Hope that helps.
I think it is a way of looking into your uterus. A hysterscope ingogram or ingagram (spelling) is when they squirt dye into your uterus and look at it by x-ray to see what everything looks like in the uterus and the fallopian tubes.