A 36 year old male
presents with a history of difficulty in walking, forgetfulness and inability
to concentrate and urinary incontinence.
A few weeks prior
to presentation he had been discharged from hospital where he had spent
several weeks after he had suffered head injuries as a result of a car crash.
He had been
otherwise fit and well and had not been on any medication.
On examination he
had poor orientation in place, time and person and was unable to perform
simple arithmetic. His gait was abnormal, as if he had forgotten how to walk.
In this patient
the most likely diagnosis is: