Recurrent episodes of unexplained hypoelectrolytaemia of a rare cause in a young Saudi girl.

We report a case of a 36-month-old Saudi girl who presented with recurrent episodes of unexplained hypoelectrolytaemia. Her cystic fibrosis CFTR (Cystic Fibrosis Transmembrane conductance Regulator) full gene sequence confirmed that she was homozygous for D579G mutation.

Recurrent thoracic duplication cyst with associated mediastinal gas.

Mediastinal cysts are not uncommon in the pediatric age group. Presentation varies from an abnormality found on routine chest radiograph to severe respiratory distress and even respiratory failure. Presentation depends on the age of the patient, the location of the lesion, the extent and the size of the mass, and what structures are involved.