The ultrasound image shows the nasopharyngeal teratoma as a "bubble" protruding in front of the lip of the fetus.
The tumor was resected at the base using a 600 micrometer contact YAG laser fiber on continuous mode with 10 W of energy. A minimal amount of bleeding from the base of the tumor was controlled with a noncontact YAG laser fiber. The tumor fell inside the amniotic cavity, where it was left. The procedure lasted 68 minutes. There were no maternal or fetal complications.Further details (fulltext) at the American Journal of Obstetrics & Gynecology, via the BBC.