- Idiopathic: About 60% of cases.
- Maternal causes: Diabetes (increases fetal urination), infection (CMV, toxoplasmosis).
- Placental causes: Placental tumors (e.g., chorioangioma) or vascular malformations.
- Fetal causes
- Central nervous system: Decreased swallowing.
- Gastrointestinal: Atresias at various levels.
- Cardiovascular: Anemia leading to hyperdynamic circulation and increased fetal urination.
- Neoplastic: Thoracic lesions with mass effect on esophagus. Renal tumors (mesoblastic nephroma, congenital Wilms). Sacrococcygeal teratoma. Large ovarian cyst.
- Chromosomal: For example, trisomy 21, 18.
Saturday, April 23, 2011
Causes of Polyhydramnios
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