An unusual dermoid cyst in subcutaneous tissue of the mastoid region: A case report.

Dermoid cysts of the head and neck are rare lesions. An unusual dermoid cyst in the subcutaneous tissue of the mastoid region is easily confused with lymph node abnormalities; therefore, diagnosis and treatment are often challenging. We describe a 22-year-old male with an unusual dermoid cyst in the subcutaneous tissue of the mastoid region whose only complaint was a retroauricular lump, which was similar to an intumescent retroauricular lymph node. Final diagnosis was confirmed by pathological examination of the surgically removed specimen. A dermoid cyst in the subcutaneous tissue of the mastoid region is rare and may be misdiagnosed as a retroauricular lymph node. A lump may be the only presenting symptom without hearing loss and vertigo complaints. Complete excision of the tumor must be ensured and pathological analysis is important for the diagnosis.