Fetal Pleural Effusion / Chylothorax

Step-by-step decision

Choose step by step as prompted; reaching an endpoint gives the management recommendation. You can go back a step or restart anytime.

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Full pathway

1. [Decision] Extent/mediastinal shift/hydrops + cause
   Extent / mediastinal shift / hydrops + cause? (Primary (prenatal hydrothorax/postnatal chylothorax, lymphatic leak) or secondary (cardiac/infection/anemia/mass/chromosomal). ~50% isolated, ~50% with hydrops; chromosomal ~10% (trisomy 21, Turner), Noonan <5%. First detailed anatomy + echocardiography + karyotype/microarray + infection/anemia assessment (with hydrops).)
   • Small-moderate, no mediastinal shift, no hydrops → Small-moderate · observe
   • Large/mediastinal shift/hydrops/polyhydramnios/rapid progression → Large/hydrops → thoracocentesis/thoracoamniotic shunt
   • With chromosomal abnormality/syndrome (Noonan/Turner) or a clear secondary cause → With chromosomal/syndrome/secondary cause
2. [End] Small-moderate · observe
   Small-moderate, no mediastinal shift, no hydrops: observe + serial ultrasound (some resolve spontaneously); complete karyotype/microarray + infection screen; monitor progression and cardiac function.
3. [End] Large/hydrops → thoracocentesis/thoracoamniotic shunt
   Large/mediastinal shift/hydrops/polyhydramnios/rapid progression: thoracocentesis (10% cured by a single tap, most reaccumulate in 24–48 h) or thoracoamniotic shunt (most effective, ~72% survival with hydrops, prevents pulmonary hypoplasia, reverses hydrops/polyhydramnios); steroids at 24–34 weeks; deliver at a capable center, postnatal chylothorax → drainage/octreotide/MCT formula.
4. [End] With chromosomal/syndrome/secondary cause
   With chromosomal abnormality/syndrome (trisomy 21, Turner, Noonan) or a clear secondary cause (cardiac/anemia/infection/mass): manage by cause (anemia → IUT; TTTS → laser; arrhythmia → drugs; large chest mass → shunt); genetic counselling; prognosis follows the underlying condition.

Source guidelines & references

• Fetal pleural effusion (hydrothorax/chylothorax) evaluation and thoracoamniotic shunt

This pathway is our own synthesis of the decision logic in the guidelines above (not the guideline verbatim); thresholds and workflows change as guidelines update — in practice follow the latest guideline, your institution's protocol and the individual patient.

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