Cysts treatment is limited to surgical removal for the majority of cysts. Not all oral cysts are odontogenic cyst. Functional cysts and hemorrhagic ovarian cysts usually resolve spontaneously. The ovaries usually contain small follicular cysts visible by ultrasound. Small ovarian cysts are common in healthy women. Alteration of fertility and ovarian cysts can also occur in females. Other types include cysts due to endometriosis, dermoid cysts, and cystadenomas. Large vacuoles may coalesce and produce fatty cysts, which are irreversible lesions. Although most cases of ovarian cysts involve monitoring, some cases require surgery. Lymphangiomatosis is a disease involving multiple cysts or lesions formed from lymphatic vessels. Enlarged ovaries accompanied by increased numbers of small cysts correlates with PID. The association of dermoid cysts with pregnancy has been increasingly reported. These "cysts" are actually immature follicles not cysts. Prevalence of sacral spinal (Tarlov) cysts in Persistent Genital Arousal Disorder. Rete tubular ectasia is a disorder of the rete testis characterized by multiple benign cysts.