Fig 4.

Spontaneous otorrhea and dizziness (patient 10). A and B, Axial and coronal CT scans through the left middle ear and osseous labyrinth show absence of osseous cochlear dysplasia (A) and a bulbous appearance of the internal auditory canal (arrow in B), with no middle ear or mastoid cavity filling. C, Intrathecal Gd-DTPA-enhanced axial T1-weighted SE fat-saturated MR image through the upper medulla oblongata shows abnormal filling of the left cochlear structure (arrow). D–F, Coronal T1-weighted SE fat-saturated MR image through the cerebro-pontine angle cisterns. Spot view of the right side (D) shows CSF filling up to the lamina cribrosa. However, further membranous labyrinth structures (semicircular canals) are filled on the left side (arrow in E), as well as the cochlear duct (arrow in F). Additional CSF deposit is seen in the floor of the sphenoidal sinus (arrow in G) (the patient was positioned in a prone head-down position). This patient was eventually diagnosed with juvenile transient osteoporosis because of an upper limb pathologic fracture.