Tim was born at full term with a birth weight of 3.6 kg. His antenatal ultrasound scan performed at 21 weeks of gestation was normal with adequate liquor volume. At birth, the paediatrician was consulted to stand by the delivery of meconium-stained liquor. Tim developed respiratory distress after birth with an Apgar score of six at 1 minute, seven at 5 minutes and eight at 10 minutes. He was intubated and required invasive ventilatory support. Chest X-ray showed a right pneumothorax, which was managed with a chest drain insertion. After stabilisation, a physical examination revealed a markedly distended abdomen with palpable masses. His blood test showed serum sodium of 134 mmol/L, potassium of 5.4 mmol/L, urea of 5.1 mmol/L and serum creatinine of 120 umol/L. His mother’s blood test for renal function was normal, with urea at 6 mmol/L and creatinine at 70 umol/L. What could be the palpable masses?