A hydrosalpinx is a particular type of tubal blockage in which the tube is obstructed near its fimbrial end - the open, outside end of the fallopian tube which is in contact with the surface of the ovary. With hydrosalpinx, the tube becomes filled with clear watery fluid.
A pyosalpinx is an acutely inflamed blocked tube filled with pus. Sometimes it can be treated with antibiotics but pyosalpinx can also rupture and form an abscess in the pelvis, much like a burst appendix. If this occurs, patients require an operation to drain it and the abscess.