Conventional and Dynamic Contrast-enhanced MRI Findings of Pleomorphic Adenoma of the Lacrimal Gland

Objective:To evaluate the diagnostic value of conventional and dynamic contrast-enhanced MRI in pleomorphic adenoma of the lacrimal gland.Methods:The MRI findings were retrospectively analyzed in 10 cases with pleomorphic adenoma of the lacrimal gland.The MR techniques included conventional MR imaging,dynamic contrast-enhanced MR imaging and 3D fast spoiled gradient echo (FSPGR) sequences.After dynamic contrast-enhancement and post-processing of the data acquired,the time intensity curves (TICs),time to peak (Tpeak),washout ratio (WR),maximun ascending slope (Slope) and enhancement ratio (ER) were obtained and studied.Results:Pleomorphic adenoma of the lacrimal gland usually appeared as a round or oval well-defined mass located in the lacrimal gland fossa,which mostly showed iso-intensity on T1WI and iso-or hyper-intensity on T2WI images on plain MRI as well as mild to moderate enhancement after contrast administration.Deformation and depression of adjacent bones was commonly seen.The TIC in 10 cases showed gradually and substantially ascending,Tpeak was (201.8±41.36)s,WR was (1.72±0.97)%.Conclusion:Conventional MRI combined with dynamic contrast-enhanced MRI is useful for the diagnosis of lacrimal gland pleomorphic adenoma.