The article describes the case of a 29-year-old woman diagnosed with Gorham-Stout syndrome (GSS), a rare mono- or polyostotic disease in which idiopathic intraosseous angiomatous proliferation leads to progressive resorption of bone. Case highlights include exacerbation of the initially intermittent symptoms after childbirth, outcome of radiography of the pelvis, and clinical amelioration of GSS on administration of bisphosphonates.