HighlightsGorham-Stout disease (GSD) is a very rare idiopathic bone disorder characterised by spontaneous and progressive osteolysis, associated with angiomatous proliferation and soft tissue swelling without new bone formation.The clinical presentation of GSD includes pain, functional impairment, and swelling, although a few asymptomatic cases have been reported, similar to our case.We present this rare case of GSD with several localisations to emphasise that any procedure appearing to be simple can go catastrophically wrong and can result in the discovery of something that is unexpected and extremely rare.We wish to emphasise the extreme rarity of the case, focusing on the large difference between the preoperative panoramic radiograph and whole-body CT and MRI images obtained on the day after the first surgical procedure.