preauricular tag fetal ultrasound

A preauricular tag detected on a fetal ultrasound is a small, benign fleshy growth located in front of the ear. It occurs in approximately 5 to 10 per 1,000 births and typically results from minor developmental disruptions in the first branchial arch.

Clinical Significance & Prenatal Diagnosis:

• Appearance: A protuberant, small, fleshy papule (sometimes containing accessory cartilage) located anterior to the tragus.
• Imaging Detection: Frequently spotted on routine anatomy scan. 3D ultrasound is highly useful to assess for facial symmetry.
• Associated Anomalies: While usually an isolated, harmless cosmetic finding, it can be associated with chromosomal syndromes, including Goldenhar syndrome or chromosomal deletions.
• Potential Systemic Links: Some studies suggest a weak association with urinary tract abnormalities (such as renal dysplasia) or hearing impairment, leading some specialists to recommend a postpartum renal ultrasound.

Finding a preauricular tag is generally considered a low-risk finding, but it prompts a more detailed anatomy search to ensure no other markers are present.

Clinical Fetal Scan Video: