Vertebra of Egyptian mummy affected with tubercular caries, from the Middle Kingdom. The Middle Kingdom of Egypt (also known as The Period of Reunification) is the period in the history of ancient Egypt between about 2000 BC and 1700 BC. Tuberculosis of the spine (Pott disease or Pott's disease) is a form of tuberculosis that occurs outside of the lungs whereby disease is seen in the spinal vertebrae.