title: 'Sack of marbles' in mature cystic ovarian teratoma.
abstract: Mature ovarian cystic teratoma (also known as ovarian dermoid cyst) is a slow growing encapsulated tumor which contains well differentiated derivations of at least two out of three germ cell layers (i.e. ectoderm, mesoderm, and endoderm). The lesion is lined by ectodermally derived squamous epithelium containing skin appendages. The cyst content commonly consists of keratin, sebaceous materials and fat. On CT images, the intracystic globules of sebum/fat could appear as multiple free floating rounded hypoattenuating nodules, giving the classical 'sack-of-marbles' appearance.
authors.affiliation: Department of Radiology, Queen Mary Hospital, 102 Pokfulam Road, Hong Kong, Hong Kong SAR. viclkh88@gmail.com.
authors.forename: K H
authors.identifier: http://orcid.org/0000-0002-1641-7180
authors.initials: KH
authors.lastname: Lee
mesh_terms: D003884:Dermoid Cyst / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000000981:diagnostic imaging*; D013724:Teratoma / Q000000981:diagnostic imaging*
keywords: Computer tomography; Intracystic fat globules; Mature cystic teratoma; Ovarian dermoid cyst