The urogenital sinus is an opening in the pubic bone that opens into the large cistern of the urinary canal. One tube enters and exits the sinus - the urethra. If there is inflammation in the canal, then the penetration of urine into the sinus is difficult. At this time, itching and discomfort are felt in the pubic or thigh area. When inflamed, the bladder comes into contact only with the outer wall of the sinus. The inner portion of the bladder is sandwiched between it and the pubis. To diagnose a urogenital sinus, you need to consult a urologist.