DISCLAIMER: Any medical information in this material is intended to inform and to educate and is not a tool for self-diagnosis or a replacement for medical evaluation, advice, diagnosis or treatment by a healthcare professional. You should speak to your physician or make an appointment to be seen if you have questions or concerns about this information or your medical condition.

Viewer discretion is advised: The educational material contained herein may contain medical images that non-professional viewers may find disturbing.

The patients who appear in this programme freely gave their consent for the authors to use their images for educational purposes. Where real patients were filmed or photographed, we have not shown their faces or other identifiable features.