preauricular tag fetal ultrasound

preauricular tag detected on a fetal ultrasound is a small, benign fleshy growth in front of the ear, occurring in 5-10 per 1,000 births, typically resulting from minor developmental, first-arch disruptions. While usually an isolated, harmless cosmetic finding, it warrants a detailed anatomy scan to rule out associated syndromes or, rarely, renal/hearing issues. Key Aspects of Prenatal DiagnosisWhat it looks like: A protuberant, small, fleshy papule (sometimes containing cartilage) located anterior to the tragus.Imaging Detection: Frequently spotted on routine ultrasound, sometimes in 3D, which helps assess for facial symmetry.Significance: While typically a minor anomaly, they can be associated with chromosomal syndromes, including Goldenhar syndrome or chromosomal deletions.Potential Associations: Some studies suggest an association with urinary tract abnormalities (such as renal dysplasia) or hearing impairment, leading some specialists to recommend postpartum renal ultrasound Usually a low-risk finding, but finding a tag often prompts a more detailed search