Angular dermoid (deep)

Case contributed by A.Prof Frank Gaillard

Presentation

Proptosis.

Patient Data

Age: 35 Years
Modality: CT

A bony defect in the superolateral aspect of the left orbit and extending into the anterior cranial fossa is filled with a lobulated low density lesion, without calcification, fat or enhancement. Mild proptosis noted. 

Modality: MRI

A well circumscribed lobulated mass arising from the upper outer quadrant of the left of orbit with bony remodeling and extension into the anterior cranial fossa is present. It is located posterior to the orbital segment and is mostly low T1 and high T2 is signal without enhancement. Peripheral areas of intrinsic high T1 do not attenuate on fat saturated sequences. No particularly high signal on DWI is noted. 

Case Discussion

The patient went on to have surgery which confirmed the diagnosis of a dermoid. These are the most common cystic lesions to be located at this location, however in the absence of a fatty (sebum) component makes it harder to confidently make the diagnosis preoperatively. The other possibility in this case would be of an intradiploic epidermoid, although the absence of restricted diffusion makes this less likely. 

PlayAdd to Share

Case Information

rID: 46908
Case created: 23rd Jul 2016
Last edited: 21st Sep 2016
System: Head & Neck
Inclusion in quiz mode: Included

Updating… Please wait.
Loadinganimation

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.