“…The reasons for these variations may include delayed diagnosis, variability in imaging (i.e. radiography, ultrasonography, computed tomography (CT) and MRI), regional lymph node sampling technique (aspirates versus biopsy), sample size, follow-up and lack of standardisation in treatment and restaging (Goldschmidt & Zoltowski 1981, Meuten et al 1981, Bennett et al 2002, Turek et al 2003, Williams et al 2003, Emms 2005, Hobson et al 2006, Anderson et al 2015, Potanas et al 2015, Palladino et al 2016, Meier et al 2017, Pollard et al 2017, Skorupski et al 2018. proposed a clinical staging scheme based on primary tumour size, locoregional lymph node size and presence of metastasis.…”