What do your treatment volumes include when treating a resected mucoepidermoid carcinoma of the parotid gland with close, but negative, margins where recurrence would require sacrifice of branches of the facial nerve?  

Following general principles, the 3 targets are tumor bed, operative bed and subclinical non-operative bed.  Ideally, the patient has preoperative imaging, as unfortunetly it is still common that these pts are operated without oncologic assessment. As the scar is part of the operative bed, it ...