Ms. X is a 47-year-old patient who presents for a complaint…

Ms. X is a 47-year-old patient who presents for a complaint of vulvar pain. While you are palpating the introitus of the vagina, the patient jumps and complains of severe tenderness. A mass at the 4 o’clock position is palpated that is warm to touch and fluctuant.  These clinical findings are consistent with which of the following?