Andrew H S Lee1, Ian O Ellis2. 1. Histopathology Department, Nottingham University Hospitals, City Hospital Campus, Hucknall Road, Nottingham, NG5 1PB, UK. andrew.lee@nuh.nhs.uk. 2. Histopathology Department, Nottingham University Hospitals, City Hospital Campus, Hucknall Road, Nottingham, NG5 1PB, UK.