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Minimally invasive surgery is a technique that provides numerous benefits to the patient, but presents challenges to the surgeon in that dexterity, hand-eye coordination and haptic perception are compromised. Robot-assisted minimally invasive approaches have addressed the problems of dexterity and coordination; however, the lack of kinesthetic and tactile feedback remains a significant drawback. Despite many advances in this area, little is currently known about what level of feedback performance is adequate to allow the surgeon to palpate tissue to detect an underlying tumour. This paper describes experiments that were conducted on ex-vivo porcine lung, using artificial tumours, to elucidate one measure of sensor performance required to detect the presence of a tumour. The results indicate that a force- sensitive probe with a sensing range of 0 to 10 N and a resolution of 0.01 N would allow a tumour to be localized via palpation using kinesthetic feedback.