Looks to be a rare and isolated case in chicks of 25 days. Oviduct infection is becoming very common in layers and breeder females which can be due to Infectious bronchitis specially of Qx type complicated with E.Coli infection. This also can be an ascending infection when females are insemination and no sterile precautions are taken. MYCOPLASMA is another infection which can spread from abdominal air sacs. Learned colleagues may through more light on causes and prevention of oviduct infection in layers and breeder females.
I have seen many cases of cystic oviduct while conducting postmortem of broiler birds. The fluid contained in the cyst may be clear, translucent or contain some flecks. If E. coli gets access, it may attain appearance of salpingitis.
These type of cystic ducts are also seen in case of male broilers. I think it is congenital anomaly and it should be called as cystic ducts(whether Mullerian or Wolfrian ducts).
Dear AHMED ANJUM, please be specific. ....in female broilers chickens (not in broilers) in a mixed male & female broiler production.
Dear Tahir Naseem, Cystic oviduct and following salpingitis should be in female chickens. If you have seen in male birds, please provide a post-mortem picture.
@Alireza Talebi Yes you are absolutely Right these type of lesions are normally seen in female birds only. But I have seen in male broilers also. Please give me your email address, I will send you the PM picture.