Anhydramnios
Dr Abhilash Sandhyala and Radswiki et al.
Anhydramnios is a term where there is a complete lack of liquor volume.
Pathology
Anhydramnios can result in a number of situations
- fetal renal tract anomalies
- renal agenesis
- large ureterocoele : if capable of causing bilateral renal tract obstruction 6
- posterior urethral valves : with severe / complete obstruction 1
- preterm premature rupture of membranes (PPROM)
- placental insufficiency 4
- silent uterine rupture 4
- nimesulide therapy (single report only 5)
- chemotherapeutic agents administered during pregnancy
- trastuzumab / paclitaxel 3
Radiographic features
Antenatal ultrasound
Typically shows a complete absence of amniotic fluid around the fetus. Colour Doppler interrogation may be of value in selected cases when loops of cord false mimic extra space around the fetus as amniotic fluid 2. Visualisation of fetal structures can sometimes be very difficult due to the absence of liquor volume.
Complications
- fetal akinesia deformation sequence with development of pulmonary hypoplasia if anhydramnios has been present for a long period
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