Dr Derfel ap Dafydd

Consultant Radiologist and Training Programme Director BSc MRCP FRCR

Specialism: Head and neck, Thyroid, Urology

Available at: Chelsea, Kingston

Special interests:

  • CT of the neck and body
  • MRI of the Head and Neck
  • MRI of the kidneys
  • MRI of the prostate
  • Ultrasound guided aspiration/biopsy of the neck and thyroid
  • Ultrasound guided biopsy of soft tissue sarcoma
  • Intra-oral ultrasound
  • Teaching and Training


Dr Derfel ap Dafydd is a Consultant Radiologist with a special interest in imaging of the Head & Neck and imaging of the urological system.

Dr ap Dafydd obtained  his medical degree at Cardiff University in 2005. As an undergraduate he also obtained a 1st class degree in Medical Genetics. 

He completed his general physician’s training and MRCP at Bart’s and the Royal London. After concluding his radiology training at Imperial, he obtained further sub-specialty training in oncological imaging at the Royal Marsden.

He was appointed as a consultant in 2016 and is now the imaging lead for the Head and Neck unit and Renal unit, and performs ultrasound guided biopsies of the neck and of soft tissue sarcomas.

As Training Programme Director, he is the educational lead for the Royal Marsden Radiology Training Programme.

He is the principle trial radiologist for the Head and Neck and the Renal research units. Particular areas of active research include intra-oral ultrasound guided Trans-oral Robotic Surgery, Ultrasound guided intra-tumoral injection of Immunotherapy and post radiotherapy MRI evaluation of the prostate and pelvic floor.

Clinical Units:​