J Korean Soc Radiol.  2019 Jan;80(1):81-87. 10.3348/jksr.2019.80.1.81.

Orbital Rim Uptake on Bone Scans and Its Clinical Significance

• Hwang YU
• Cha SJ

• KMID: 2442466
• DOI: http://doi.org/10.3348/jksr.2019.80.1.81

Abstract

PURPOSE
This study is to evaluate orbital rim uptake on bone scan and to discuss their clinical significance.
MATERIALS AND METHODS
From January 2011 to August 2013, 3149 cases of bone scans were analyzed to check for existence of uptake abnormalities in the orbital rim with relative size and position. The bone scans were compared with either positron emission tomography-computed tomography (PET/CT) or computed tomography (CT). For cases without other imaging examinations, comparisons were made with other bone scans.
RESULTS
In total, 13 cases of the orbital rib uptake were ultimately evaluated. In 6 cases, the intake abnormalities of the orbital rim appeared in superior lateral aspect of the orbital rim to occupy the highest frequency (46.2%). Distinctively, bone scans showed no abnormal uptake in medial and inferior aspect of orbital rim. The 10 cases are compared with PET/CT or CT and as a result, there are no abnormalities that correspond to the orbital lesions of bone scans. The 3 cases were compared with other bone scans and no changes in the orbital lesions were confirmed between the bone scans.
CONCLUSION
There is an unilateral, small, focal orbital rim uptake on bone scans to be possibility of nonspecific benign lesions.

MeSH Terms

Electrons
Multidetector Computed Tomography
Orbit*
Positron-Emission Tomography and Computed Tomography
Prefrontal Cortex
Radionuclide Imaging
Ribs

Figure

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  Fig. 1. A 48-year-old female with nasal septal epithelial-myoepithelial carcinoma. A. Anterior view of the bone scan shows discrete focal activity in the left superior lateral margin of the orbital rim (arrow). B, C. Axial and coronal fused positron emission tomography-computed tomography images demonstrate no corresponding abnormal uptake in the left superior lateral margin of the orbital rim.

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  Fig. 2. A 32-year-old male with urinary bladder cancer. A. Anterior view of the bone scan shows discrete focal activity in the superior lateral margin of the orbital rim (arrow). B. The bone scan performed at the 2-year follow up demonstrates no remarkable change over time (arrowhead).

Reference

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