Renula is a form of micocele that specially occurs in the floor of the mouth, in association with the duct of the sublingual salivary glands or rarely the sub mandibular glands
- Obstruction to the duct by calculus formation
- Compression of the duct by trauma or a growing tumor in the vicinity
- Perforation of the duct due to injury
- Absence of duct itself (Atresia)
- Scar or stricture formation to the duct, especially after surgery.
The development of the Renula depend on the disruption of the flow of saliva from the secretory apparatus of a salivary glands.
- The lesions are most often associated with mucus extravasation into the adjacent soft tissues caused by a traumatic duct insert the insert include crush type injury and severance of the excretory duct of the minor salivary gland.
Clinically Renula presents a soft, fluctuant, unilateral swelling in the floor of the mouth, which often causes deviation of the tongue
The lesion typically has a bluish translucent appearance and it often resembles the distended “frog’s belly”
RENULA DIAGNOSIS/ INVESTIGATION:
If the lesion is deep seated one, the bluish coloration is usually absent and when such lesion herniates through the mylohyoid muscle, they are called the “Plunging” type of Ranula.
Treatment is done by surgical excision or marsupialization