Asymmetric left perineal cystic mass in a female.

Answer: Bartholin gland cyst (not too much stranding but you can defer to the clinicians to see if they think it’s infected)

reference: http://radiopaedia.org/articles/bartholin-gland-cyst

don’t forget the Gartner duct cysts and periurethral diverticula which are located in slightly different locations