Imaging findings
The most commonly involved sinuses, defined as opacification of the
sinus cavity, were the frontal (n=33, 84%) and ethmoid (n=25, 64%)
(Table 2). The most common intracranial complications were SDE (n=25,
64%) and EDA (n=12, 31%). Five patients had more than one simultaneous
collection. Frontal bone osteomyelitis was found in three patients.
Median time from admission to CT and MRI was six hours (range 2-58) and
15 hours (range 4-70) respectively. In eight patients MRI demonstrated
an intracranial collection not detected by the CT alone.