Well, I suppose it can be many things, depending on the other clinical signs.
It can be an hematoma, a cyst.. both can be among the muscular tissue.
stomach
The fluid that is necessary for the muscular sytem is blood
The scrotum is a pouch that holds the testes and parts of the spermatic cord. Its muscular activity regulates the temperature of the testes.
green wallet like pouch that contains with three green colored individual decon packets
Diverticulosis
The Pouch of Douglas is found behind the cervix in the female abdominal cavity. No fluid means that no issues should arise when trying to conceive.
The Muscular-Skeletal System.
yes.
Behind the uterus you have rectum. A fold of peritoneum separates the both organs. This retro uterine pouch is called as Pouch of Douglas. If there is fluid over there, that is noticed in ultrasonography.
Cyst/o - It's Combining form meaning Bladder or Cyst Cyst is a closed sac or pouch with a definite wall and contains fluid.
Muscular
The muscular system contains muscles. These muscles are responsible for movement, posture, and generating heat for the body.