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Characteristic findings of malignant melanoma in the sinonasal cavity on magnetic resonance imaging.
MedLine Citation:
PMID:  23075725     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
BACKGROUND: Malignant sinonasal melanoma (MSM) is a rare tumor with a perplexing signal intensity due to variable histopathologic components. This study was undertaken to delineate its MR imaging features.
METHODS: MR imaging findings of 10 patients (6 women and 4 men, mean age 61.3 years old) with pathologically confirmed MSM were retrospectively reviewed. The location, size, signal intensity, enhancement, and internal imaging characteristics of all tumors were evaluated. Signal intensity and degree of enhancement was graded in comparison with the gray matter and adjacent muscle uptake, respectively.
RESULTS: There were 8 tumors that were pathologically confirmed to contain melanin. Compared to gray matter of the brain, 7 of them demonstrated hyperintensity on T1WI and 6 (6/7) showed hypointensity on T2WI. There was multiple linear, dark-signal intensity on T2WI within the mass in 9 of the 10 patients' tumors. Evaluated with gadolinium-enhanced imaging, all 10 patients showed moderate enhancement within the areas that were isointense in the lesion on pregadolinium T1WI. Moreover, some parts which displayed hyperintensity on T1WI within the tumors of 7 patients showed mild enhancement that was similar to muscle on a time-intensity curve (TIC).
CONCLUSIONS: MSM shows characteristic MR signal intensity (hyperintensity on T1WI and the linear, low-signal intensity on T2WI), which may provide valuable information for clinical diagnosis. Together with conventional MRI, TIC may be useful for indicating pleomorphic patterns of MSM.
Authors:
Qing-Gang Xu; Li-Ping Fu; Zhen-Chang Wang; Jun-Fang Xian; Li-Yan He; Zheng-Yu Zhang; Cheng-Yao Liu
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chinese medical journal     Volume:  125     ISSN:  0366-6999     ISO Abbreviation:  Chin. Med. J.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7513795     Medline TA:  Chin Med J (Engl)     Country:  China    
Other Details:
Languages:  eng     Pagination:  3687-91     Citation Subset:  IM    
Affiliation:
Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China (Email: xuqinggangcn@yahoo.com.cn).
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