The role of the mastoid antrum in the developing ear is still controversial.
The other theory of development of the mastoid air cell system suggests that the precursors of the mastoid cells are present at birth as periantral, mesenchyme-filled loculi that are visible on histologic sections.
In a histologic study of the temporal bones of newborns, conducted by Valtonen and Karmody, the mastoid antrum was noted to be present in all subjects, without significant differences for age, gender, or laterality (right versus left).
We delineate the significance of bright signal found in the mastoid on T2-weighted MRI in consecutive patients referred for otologist/neurotologist evaluation at an academic medical center.
A diagnosis that could be consistent with MRI fluid signal in mastoid air cells was found in 9 patients (32%).
8) In a series of 644 screening MRIs to rule out retrocochlear hearing loss, Mirza et al reported a 5% incidence of middle ear/ mastoid disease.