CT and MRI findings of primary orbital lymphoma and review of literature(report of 7 cases)

WANG Xiang-ming; HUANG Wen-xin

Journal of China Clinic Medical Imaging ›› 2006, Vol. 17 ›› Issue (9) : 484-487.

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CT and MRI findings of primary orbital lymphoma and review of literature(report of 7 cases)

WANG Xiang-ming1, HUANG Wen-xin2

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Abstract

Objective: To study CT and MRI findings of primary orbital lymphoma, to improve the diagnostic ability of this disease. Methods: Plain CT, enhanced CT and delayed CT scans were performed in all 7 patients with primary orbital lymphoma proved histopathologically. In 3 of the 7 patients, the plain and enhanced MRI were performed. Both CT and MRI findings were analyzed retrospectively. Results: Bilateral lesions were found in 2 patients, located in bilateral conjunctivae and lacrimal gland respectively. Unilateral lesion was found in 5 patients. The lesion located in lacrimal duct in 1 patient, in the other 4 patients the lesion crossed orbital septum and molded around orbital structures with irregular shape, and the lacrimal gland and lacrimal duct were involved, in 3 of the 4 patients the diffuse lesion infiltrated extraconal and intraconal space. There were no displacement of extraocular muscle, thickening and deformity of ocular ring in all patients. Destruction of orbital bone was evident in 2 patients. All the lesions presented soft tissue density similar to extraocular muscle and with distinct margin on plain CT scan, the density of lesion which showed mild enhancement on enhanced CT in 4 patients was found to decrease on delayed phase, there was no obvious change of density in the other 3 patients on delayed CT scans, compared to enhanced CT. MRI findings in 3 patients demonstrated isointense signal compared to extraocular muscle on T1WI and T2WI. However, the lesion in 2 patients was hyperintense compared to extraocular muscle after enhancement. All the lesions showed homogeneous on CT and MRI. Conclusion: The CT and MRI findings of primary orbital lymphoma are characteristic, which can highly suggest the diagnosis of this disease.

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orbit / lymphoma / magnetic resonance imaging / tomography / X-ray computed

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WANG Xiang-ming;HUANG Wen-xin. CT and MRI findings of primary orbital lymphoma and review of literature(report of 7 cases)[J]. Journal of China Clinic Medical Imaging. 2006, 17(9): 484-487