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Theca lutein cysts (TLC), also known as hyperreactio luteinalis (HL), are a type of functional ovarian cyst. They are typically multiple and bilateral

 The cysts are usually large (2-3 cm) and have a typical multilocular cystic appearance across all imaging techniques.

Ultrasound

Bilateral enlarged, multicystic ovaries. The cysts are classically thin walled and have clear contents. There is large amount of solid component which is possibly the residual ovarian stroma.