In orbital cellulitis, what imaging modality is preferred for diagnosis?

Orbital cellulitis is a serious infection that can lead to complications such as vision loss, so accurate diagnosis and assessment of the condition are critical. The preferred imaging modality for diagnosing orbital cellulitis is an orbital CT scan.

CT imaging provides excellent visualization of the orbital structures, enabling identification of key features such as the extent of the infection, the presence of any abscess formation, and the involvement of adjacent anatomical structures, including the sinuses. The rapid acquisition of images and high resolution of CT scans make it particularly effective for evaluating acute conditions like cellulitis, where critical treatment decisions need to be made quickly.

While ultrasound can provide some information, it is not as definitive as CT in the diagnosis of orbital cellulitis. X-rays are not routinely used for this purpose due to their limited ability to visualize soft tissue structures, which are essential in assessing infections. MRI, while useful for evaluating certain conditions in the orbit, is often not the first choice in acute settings where rapid diagnosis is necessary, mainly due to longer acquisition times and availability constraints in emergency situations.

Thus, the use of orbital CT is preferred due to its effectiveness in accurately diagnosing orbital cellulitis and guiding treatment decisions swiftly.