[Management of fetal mediastinal shift: a practical approach]

Area of Science:

• Medical Imaging
• Fetal Medicine
• Pediatric Radiology

Background:

• Fetal mediastinal shift is a critical indicator requiring careful evaluation.
• Accurate diagnosis of fetal thoracic abnormalities is essential for appropriate management.

Purpose of the Study:

• To review fetal chest ultrasound screening techniques.
• To outline the diagnostic work-up for fetal mediastinal shift.
• To identify key ultrasound imaging features for diagnosis.

Main Methods:

• Systematic approach to fetal thorax evaluation, starting with situs confirmation.
• Use of a median sagittal line from the four-chamber view for spatial orientation.
• Echotexture analysis of thoracic structures in cases of mediastinal shift.

Main Results:

• A proposed systematic approach correlates mediastinal shift direction and hemithorax echogenicity with potential etiologies.
• Heterogeneous masses with contralateral enlargement suggest diaphragmatic hernia or macrocystic congenital cystic adenomatoid malformation.
• Homogeneous masses suggest microcystic congenital cystic adenomatoid malformation; small ipsilateral hemithorax with isoechoic contralateral side suggests lung hypoplasia-agenesis-aplasia.

Conclusions:

• A structured ultrasound approach aids in diagnosing fetal thoracic abnormalities presenting with mediastinal shift.
• Specific imaging features guide the differential diagnosis between common congenital anomalies.
• Early and accurate diagnosis through ultrasound improves prenatal counseling and management planning.