The histology of first sample will be analysed by conventional pathology and the second sample will be analysed by the new technology REIMS. REIMS is Rapid Evaporative Ionization Mass Spectrometry. This new technology uses mass spectroscopy to analyse the tissue. REIMS has been dubbed the 'iKnife' or 'intelligent knife' colloquially as when coupled with surgical diathermy the gas pattern produced is unique to the tissue and helps surgeons know where to cut. The diagnostic ability of this technology will be compared against the gold standard, which is histological examination.