Dermoid Cyst of the Frontal Bone: A Case Report

Introduction: Dermoid cysts are benign tumors that originate from aberrant primordial tissues. About 7% of all dermoid cysts are located in the head and neck region. We present here the case of a periorbital dermoid cyst in a 34 years old patient, involving the frontal bone. Case Report: We report the case of a 34 years old female patient, who has a history of a cystic formation of the superior inner angle of the right orbit, for which she received surgery 3 years prior. Clinical examination found a swelling located in the superior inner angle of the right eye, of hard consistency, painless, without local inflammatory signs, measuringapproximatively 2 cm. A CT-scan was realized, showing images of an encapsulated and limited supraorbital lesion, developed on both sides of the frontal bone, with an external component. Histopathology examination revealed the presence of keratinized squamous cells, confirming the diagnosis of a dermoid cyst. Conclusion: Frontal dermoid cysts are uncommon but need to be considered as a differential diagnosis of any mass in orbital region. CT can help to suggest the diagnosis. Its surgical excision must be complete to avoid recurrence.