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Diagnostic sensitivity was improved by CT alone or combination of US and CT for CLNM (A) and LLNM (B). Overall sensitivity of US and/or CT for LLNM was higher than for CLNM. Among Choi (43) and Lesnik (50) studies which only evaluated cervical lymph nodes larger than 10 mm, the combination of US and CT also provided highest sensitivity. The sensitivity for diagnosis of CLNM and LLNM by combination of US and CT was not evaluated in Ahn study (35).
