Fibrodysplasia ossificans progressiva: Diagnosis with ultrasound.

Fibrodysplasia ossificans progressiva (FOP) is an extremely rare connective tissue disease, diagnosed by genetic testing. This is the first report in English literature wherein an ultrasound examination suggested this specific diagnosis. In this case, a two month old girl presented with bi-parieto-occipital swellings that were being managed as subgaleal haematoma.