Imaging in Ovarian Dermoid CystFloating Ball: A Pathognomonic Sign of Mature Cystic Teratoma

Abstract

Teratomas in the ovaries can be classified as Mature Cystic Teratomas (MCT), immature teratomas and mono-dermal teratomas which includes Struma ovarii, neural tumours and carcinoids. Multimodality imaging like Ultrasonography (US), Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) approach can be used in the correct diagnosis of mature cystic ovarian teratomas. On US, it is characterised by echogenic sebaceous material and calcification. Fat attenuation can be visualised on CT. The sebaceous component is better identified with MRI fat suppression techniques. Immature teratomas are heterogeneous, partly solid lesions with scattered or coarse calcifications and small foci of fat. The imaging features of Struma ovarii is non-specific. We present a case of MCT which has a pathognomonic appearance of globular ball floating in a cyst with fat-fluid level.

Keywords

• globular ball
• fat-fluid level
• ovarian teratomas