Ultrasound of cranium in osteogenesis imperfecta type 2

Osteogenesis imperfecta type 2 with demineralization of the cranial vault.
(A) Cranial vault appears normally mineralized.
(B) Mild transducer pressure over the cranial vault results in flattening of the skull.
(C) Caput membranacae or membranous coverings of the intracranial content occurs when the demineralization is so significant that no appreciable calvarium bone ossification has occurred. Note the absence of a bright wall line representing ossified bone, which should normally encircle the intracranial contents.