Ovarian torsion with dermoid cyst


This ultrasound case shows many of the typical features of an ovarian torsion. The ovary is distended with absent Doppler flow and some adjacent free fluid. The ovary also contains a 4 cm dermoid cyst with an echogenic Rokitansky nodule ('dermoid plug').  

Around 50% of torsions occur in ovaries which contain a lesion and around 50% of these are dermoid cysts.