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Prenatal diagnosis of an isolated skin tumor of the chin

A healthy 26-year-old woman, gravida 3 para 2, was seen at 22 weeks’ gestation for a second-trimester ultrasound examination. She had no significant medical history and had had a normal pregnancy up to this point. Ultrasound examination revealed a medial homogeneous mass protruding from the chin of a female fetus. Color-flow mapping showed no vascularization, and no other abnormality was detected. Two-dimensional (Figure 1) and three-dimensional (3D) (Figure 2) ultrasound examination at 33 weeks’ gestation showed the tumor to have a maximum diameter of 3 mm and a length of 6 mm. A thorough magnetic resonance imaging (MRI) examination of the fetal brain performed at 35 weeks of amenorrhea, aiming to accurately visualize the fetal midline cerebral structures, showed no abnormality. The infant was delivered vaginally at 39 weeks’ gestation, and weighed 3335 g. Clinical examination of the neonate was normal other than the presence of a 6-mm tag-like skin-covered mass situated on the median part of