Table 2 Distinguishing imaging features among cystic lesions in the sublingual and submandibular spaces
Ranula | Dermoid | Epidermoid | |
|---|---|---|---|
CT | -Well circumscribed cyst | -Mixed cystic and solid -May contain calcifications | -Well circumscribed cyst -No distinct solid component |
MR | -Fluid signal with variable T1 signal (proteinaceous contents) | -Fat globules with “sack of marbles” appearance -Heterogenous signal due to dermal elements and cystic composition | -Diffusion restriction |
Site | -Typically associated with the salivary glands, commonly sublingual gland -May extend into submandibular space (plunging ranula) | -Most commonly in the floor of the mouth, specifically within the sublingual and submandibular spaces | -Most commonly in the floor of the mouth |
Histology | -Resemble mucous retention cyst | -Presence of skin appendages (hair, sebaceous glands, sweat glands) | -Lack of skin appendages |