The results of 20 patients were included in the analysis. A paired-samples t-test revealed no significant difference between clinical and ultrasound widths (t=-1.324, p=.20). Similarly, there was no significant difference between the lengths found from clinical assessment and ultrasound (t=-1.093, p=.29). For different tumor types, there was no significant difference between clinical and ultrasound widths or lengths for basal cell carcinoma (t=-1.307, p=.23; t=-1.389, p=.20) or squamous cell cancer (t=-0.342, p=.73; t=0.427, p=.68). CONCLUSION There is a diagnostic role for high-resolution ultrasound in Mohs surgery regarding the delineation of surgical margins, but its limitations preclude its practical adoption at this time.