CEUSP. Valencia. Venezuela
Following images show a case of fetal abdominal tumor first time observed at 22 weeks of pregnancy of a 23-year-old woman. Her previous ultrasonographic exams were reported to be normal.
The tumor was slightly hypoechoic, homogeneous, and well bordered by a thin hyperechoic layer. The mass was located in posterior meso-epigastric region of the fetal abdomen. The tumor had been surrounding and deviating the course of the descending aorta. Its vasculature was poor, but increased systolic and diastolic velocities were observed within the supplying vessels.
The patient was scanned again at 23, 25, and 26 weeks. The tumor had slightly increased in size reaching 45 mm in its largest diameter. Myocardial hypertrophy, hydrothorax, and ascites had also been present. The pregnancy was interrupted and the pathological study confirmed the presence of the tumorous mass originating from the psoas muscles and infiltrating vertebral bodies, diaphragm, aorta and esophagus. Final histopathological diagnosis was rhabdomyosarcoma of the psoas muscles.
Images 1, 2: 22 weeks of gestation; the image 1 shows transverse scan of the fetal abdomen at the level of the stomach - well bordered mass in front of the spine containing the descending aorta can be seen. The image 2 shows coronal color Doppler scan of the abdomen depicting deviated course of the aorta within the tumorous mass.