Thanks for writing to doctorspring.com with your health concern.
-Could you please upload a picture, so that I can opine whether it is actually a urethrocele ?
-Also, how big is the lump and what texture ?
-Do you have any urinary symptoms ?
The lump could be the bladder - you might be having a cystocele associated.
It could even be the surrounding lax vaginal wall.
If you go to a Gynaecological Specialist, a per speculum and digital examination would confirm the diagnosis.
Additional uro-flowmetry could quantify and diagnose those too.
Needless to say, a simple surgery could take care of the urethrocele, if present.
Looking forward to hearing more from you.