The Patriots backfield mystery now has a fuller explanation.

New England running back TreVeyon Henderson said Friday he was recently hospitalized after an unexpected medical emergency involving unexplained neurological symptoms.

"While the results of my comprehensive medical testing have come back positive and reassuring the cause of this remains unknown and unexplainable" Henderson wrote in a statement.

Missed Miami with an illness listing

The team listed Henderson out with an illness for last Sunday's win over Miami after he last practiced Oct. 28. He has not played since the Week 7 loss to Chicago when he had five touches for 23 yards.

Henderson said the symptoms have affected his strength coordination and some physical functions and that he is working with specialists and physical therapists.

Health first ahead of Green Bay

"I am committed to doing everything necessary to return to full health" he said. "My health and long-term well-being remain my foremost priorities."

In six games this season the former Ohio State back has 248 yards from scrimmage and a touchdown on 57 touches behind Rhamondre Stevenson. The Patriots (5-3) host the Packers on Sunday.