Table 1.

Differential diagnosis of ranula

	Lesions	Characteristics in CT Scan	Comparision with CT scan of present case
1	Dermoid cyst and epidermoid cyst	Contains keratin and another material of high protein or fat content	Shows thick capsule and contains water
2	Lipoma	Shows low attenuation	Shows high attenuation
3	Thyroglossal cyst	Present as mid-line structure, clearly demonstrable on CT	Bilateral involvement is seen, but not present as midline.
4	Branchial cyst	Present medial to the anterior border of the sternocleidomastoid muscle	Not present medial to the anterior border of the sternocleidomastoid muscle
5	Cystic hygroma	It contains septae, not a single cavity	It is present as a single cavity
6	Ranula	Contains water, present as single cavity, bilateral involvement seen	Similar to present CT characteristic.