Spinal cord herniation: unusual delayed postsurgical complication following excision of C1-2 intradural extramedullary neurofibroma

(by Marcel Ivanov, MD, PhD, MSc, FRCS, Royal Hallamshire Hospital, Sheffield, UK)

* 1. History. A 36 years old lady with a background of NF1, but otherwise fit and well, presented in 2014 with a 6-months history of balance problems, symmetric clumsiness in both hands. No sphincter problems. No headaches.

Where and what is the presumable pathology?