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Abstract
Method
A 63-year-old man visited our clinic with a chief complaint of a headache and right ocular pain. An orbital computerized tomography (CT) scan revealed a roud mass with well-demarcated capsule-like boundaries located in the inferior part of both orbits. After a systemic evaluation to exclude a systemic malignancy, we performed excisional biopsy of the right orbital mass to make diagnosis.
Result
The right orbital mass was not found at the time of surgery for an excisional biopsy. Instead, we took multiple small biopsies of orbital fat, inferior rectus muscle, and adjacent soft tissues. Histologic examination revealed a non-specific inflammatory reaction without the presence of tumor cells. There was a marked spontaneous regression of the mass in both orbits on an immediate follow-up orbital CT. The patient began steroid treatment for 12 weeks under the presumptive diagnosis of bilateral pseudotumor. There was no evidence of recurrence at the eight-month follow-up.
References
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Figure 1.
Pre-operative CT and MRI findings (2 weeks before excision al biopsy). Post-enhancement axial (A) and coronal (B) CT scan show the right eyeball is protruded compared with the left eyeball and homogenous, subtle enhanced, well demarcated round orbital mass in the inferior aspect of the globe. The both orbital mass is extending from the apex to the posterior margin of the globe (white arrows). There are displaced inferior rectus muscles not separable from the mass and no adjacent bone destruction.
Figure 2.
Pre-operative MRI findings (2 weeks before excisional biopsy). On the T1-weighted axial image (A), the bilateral orbital mass appeared as an isosignal intensity with gray matter of the brain. T2-weighted axial image with fat suppressed image (B) shows the bilateral orbital mass with central low signal intensity. Right (C) and left (D) postcontrast T1-weighted sagittal images demonstrate that elongated extraconal masses (white arrows) in the inferior aspect of both orbit, prominent in the right orbit. The masses with homogeneous low internal signal intensity and higher signal intensity in the peripheral rim (black arrow) are noted.
Figure 3.
Post-operative follow-up CT (2 hours after excisional biopsy) and MRI (1 day after excisional biopsy) findings. As compared to the previous CT, images reveal marked interval reduction of bilateral orbital masses. Mild swelling of the right inferior rectus muscle is noted and it was regarded as a result of operation. Insignificant residual mass-like lesion (black arrow) in the far posterior aspect of the inferior orbits along the inferior rectus muscles can be seen. (A, B) T1 weighted coronal image (C) and T2 weighted axial with fat suppression image (D) show only mild thickening along inferior rectus muscle and there is no round mass in both orbits which was seen in pre-operative MRI images.
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