Oral epidermoid cyst. A case report

Background Paediatric epidermoid cysts are the rare lesions in the oral cavity, especially under the age of 10 years. They appear in the midline of the mouth usually as a result of residual ectodermal tissue of the first and second branchial arches, which fuse during the third and fourth weeks of intra-uterine life. Case report We present a case of a male patient aged 8 years with swelling of the floor of the mouth, complaining of difficulty in swallowing. The ultrasonographic finding was infected ranula with a differential diagnosis of foregut duplication cyst and dermoid cyst. The cyst was surgically enucleated and was diagnosed as epidermoid cyst after histopathology. At the 18-month follow-up the cyst had not recurred.