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case_images: Color B-mode ultrasound shows that anechoic mass with a size of about 10. 9 cm x 9.0 cm x 9.0 cm can be seen in the pelvic cavity, with clear boundary and sound transmission (left). Pelvic computed tomography can see a cystic homogeneous low-density lesion with a size of 9.90 cm x 9.25 cm and clear boundary (right).
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case_images: Pelvic computed tomography (CT) can see a cystic homogeneous low-density lesion with a size of 9.90 cm x 9.25 cm and clear boundary (Figure 1).
case_images: The isolated fallopian tube twists five cycles from the cornu uteri and untwisted ovary was wrapped in twisted fallopian tube (above). Giant cyst of fallopian tube can be seen at the distal end with a diameter of 10.0 cm. The cyst surface can be seen with fimbria fallopian tube (below).
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case_images: The fallopian tube was completely preserved, and the paraovarian fimbrial cyst was removed (Figure 2).
case_images: The remnant of the accessory mesonephric duct beside the fallopian tube and the covered epithelium are typical fallopian tube-like manifestations, and the cyst was histologically recognized as a paramesonephric cyst.
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case_images: Postoperative pathology confirmed right fallopian tube paramesonephric duct cyst (Figure 3).