PMC5968242_01
Early-phase contrast-enhanced computed tomography scans show a nonenhanced mass in the right orbit and an orbital roof bone defect (arrow): axial view (a), coronal view (b).
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F1
Contrast-enhanced computed tomography (CT) showed a bony defect in the superior wall of the right orbit and an isodense mass lesion in the right orbit that did not enhance during the early phase after injection with contrast medium (Fig. 1).
Axial magnetic resonance images reveal a right orbital lesion that is of low intensity on T1 weighting (a) and high intensity on T2 weighting (b). The parenchyma near the sinus pericranii is of low intensity on T1 weighting (c) and high intensity on T2 weighting (arrow) (d). e, f The orbital mass lesion demonstrates gadolinium contrast enhancement and connects with the intracranial structure (arrow).
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F2
Gadolinium-enhanced MRI demonstrated that the mass was a heterogeneous enhanced legion (Fig. 2).
Digital subtraction angiography arterial-phase (a) and capillary-phase (b) images reveal no vascular anomalies. Venous-phase images demonstrate a connection between the cerebral vein and an extracranial vein: lateral view (c), anteroposterior view (d). Each arrow indicates the connection between the venous lake and cortical vein.
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F3
The vein draining the orbit could be clearly seen, but we could not determine whether this vein was intracranial (Fig. 3).