Ovarian Cyst.

Ovarian Cyst.
The right ovary shows a cyst of undetermined origin but likely the result of trauma. Such a cyst is difficult to differentiate from a follicular or luteal cyst by palpation or ultrasonography only. However, the cyst is endocrinologically inactive which is confirmed by the presence of a normal midcycle corpus luteum on the contralateral ovary.

Roberts SJ (1973)