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Clinical Note |

Neonatal Dermoid Cyst of the Floor of the Mouth Extending to the Midline Neck

David Bloom, MD; Daniela Carvalho, MD; Joseph Edmonds, MD; Anthony Magit, MD
Arch Otolaryngol Head Neck Surg. 2002;128(1):68-70. doi:10.1001/archotol.128.1.68.
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We describe a male neonate who presented at birth with a compressible dermoid cyst that extended from the floor of the mouth to the midline of the neck. Ultrasonography revealed a fluid-filled sublingual mass. Magnetic resonance imaging performed when the patient was 1 week old demonstrated a 2-cm, cystic, left-sided, sublingual mass that crossed the midline without extension inferior to the mylohyoid muscle. At 3 months of age, the patient developed a 1-cm, solid, submental mass. At the time of surgery, the lesion had a fibromembranous tract that extended through the myolohyoid muscle to a 1-cm cyst in the submental region. Histologic sections depicted 2 dermoid cysts and a connecting fistula. This case represents the first report (to our knowledge) of a dermoid cyst presenting in a neonate as a mass in the floor of the mouth with extension to the midline of the neck.

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Figure 1.

Full-term neonate with a compressible fluid-filled lesion in the anterior aspect of the floor of the mouth.

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Figure 2.

Magnetic resonance imaging scan of a full-term neonate showing a lesion in the anterior aspect of the floor of the mouth, without extension below the mylohyoid muscle.

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Figure 3.

Intraoperative photograph demonstrating a submental dermoid cyst extending through the mylohyoid muscle.

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Figure 4.

Fibrous tract connecting the sublingual and submental dermoid cysts with characteristic keratinized, stratified, squamous epithelium with keratin (hematoxylin-eosin, original magnification ×10).

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