Department of Pathology, Belfast Health and Social Care Trust, Belfast, Northern Ireland, UK

The author has no funding or conflicts of interest to disclose.

All figures can be viewed online in color atwww.anatomicpathology.com.

Reprints: W. Glenn McCluggage, FRCPath, Department of Pathology, Belfast Health and Social Care Trust, Grosvenor Road, Belfast BT12 6BA, UK (e-mail:[email protected]).