Student Image Challenge 92

Student Image Challenge #92

A 2-month-old girl was surgically treated for a large congenital inguinal hernia, which also included the fallopian tube. The postoperative evaluation revealed in the groin area a tubular parenchymal structure coming from the abdominal cavity, with glove-finger-like ending. Moreover, distally to the respective structure, there were some subtile tubular structures with a small amount of fluid.
The pelvic examination showed intestinal loops with discrete stasis, between which the ovary could not be detected with certainty. Given the imaging uncertainty, it was re-intervened and the inguinal orifice was considered normal.
After 2 days, the pathological structure decreased in size and especially in terms of the number of vessels in Color Doppler examination.

What would be your diagnosis?