A 39-year-old female woman with no previous history presented at 19 weeks of pregnancy for a routine fetal ultrasound. It was her third pregnancy with no notable event so far. No particular familial or personal medical history was revealed. The biometry corresponded to a term of 19 weeks and 4 days gestational age of a male fetus with no major malformation except a cervical cystic mass that was discovered near the floor of the mouth. The cyst was located right on the midline, had a well-defined and thin peripheral wall with regular contours and pure anechoic material (Figure 1). It contained a single fine septum with no intrinsic signal on colour Doppler and measured 18 x 10 mm. All these findings supported a cervical lymphatic malformation, and a medical interruption of the pregnancy was proposed to the couple after interdisciplinary decision.