Sack of marbles sign (dermoid cyst)
Imaging of
the sublingual and submandibular spaces. Dermoid cyst. Axial contrast-enhanced CT image shows a lesion with globules of fat (“sac of marbles”) in a fluid medium splaying the genioglossus muscles laterally to their respective ipsilateral sides
Imaging of
the sublingual and submandibular spaces. Dermoid cyst. Sagittal T2-weighted MR image shows a well-circumscribed cystic lesion filled with fat globules (“sac of marbles”)
Sack of
marbles sign (dermoid cyst) • Orbital dermoid cyst - sack of marbles sign - Ganzer Fall bei Radiopaedia
The sack of marbles sign, also known as the marbles in a bag sign, refers to aggregations of multiple small globules of fat within a cyst mimicking marble spheres within a sack. They appear hyperechoic on ultrasound, fat attenuation on CT, and high signal on T1WI and T2WI on MRI. It is considered highly suggestive of a dermoid cyst in the head and neck region . The term has also been used to describe ovarian dermoid cysts , although the floating balls sign is a more commonly used descriptor in this region.
