Figure 5a. PID. (a) On a US image, the left fallopian tube is dilated with echogenic debris (arrows), a finding that is consistent with pyosalpinx. The left ovary (LO) is relatively spared. (b) US image shows incomplete septa projecting into a fluid-filled tubular structure (arrow), findings that help distinguish hydrosalpinx and pyosalpinx from other adnexal conditions.