PMC2957131_01
(a) Orbital CT imaging of a right Onodi cell mucocele compressing the optic nerve (arrows). (b) T1-weighted MRI image showing a hypointense signal due to the water content in the Onodi cell (arrows). (c) T2-weighted MRI image with a high signal intensity within the Onodi cell (arrows). (d) Humphrey visual field of the right eye with significant constriction of the visual field. (e) A clinical photograph of the Onodi cell mucocele (OC) and the optic nerve (ON) prior to decompression. (f) A clinical photograph following marsupialisation of the Onodi cell and drainage of the mucocele (OC).
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Computed tomography (CT) scans revealed a dense homogenous mass in the posterior ethmoid cell, which was superior to the sphenoid sinus extending superolaterally around the right orbital apex (Figure 1(a)). Magnetic resonance imaging (MRI) confirmed the presence of an oval-shaped lesion compressing the right optic nerve (Figures 1(b) and 1(c)). A Humphrey visual field documented the marked tunnel vision in the patient's right eye (Figure 1(d)).