Corpus luteal (CL) cysts are a type of functional ovarian cyst that result when a corpus luteum fails to regress following the release of an ovum. When associated with pregnancy, it is the most common pelvic mass encountered within the 1st trimester 1. There is also some overlap with the term "haemorrhagic corpus luteum " 5.
: Subacute hemorrhagic cyst in a 37-year-old woman. Color Doppler transvaginal US scan shows a complex ovarian cyst with a seemingly solid area due to a clot (C). This could be mistaken for the solid area of a neoplasm. No flow was evident within the solid-appearing area and the cyst resolved at follow-up US 2 months later.
Focal Nodular Hyperplasia (FNH). Second most common benign liver tumor. Mostly in women. Stealth lesion. Varied appearance. Central scar as a hyper or hypoechoic linear structure, not always seen on US. Hypervascular, tortuous vessels. Thought to be a lesion related to a congenital vascular malformation. Asymptomatic.
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A Rokitansky nodule or dermoid plug refers to a solid protuberence projecting from an ovarian cyst in the context of a mature cystic teratoma. It often contains calcific, dental, adipose, hair and/or sebaceous components 1.
Endometrioma in a 46-year-old woman. Transverse transvaginal US scan reveals a complex ovarian cyst with homogeneous internal echoes. It contains a small solid-appearing area (arrow). Color Doppler US (not shown) did not demonstrate flow in the solid area.