Step 1: This is a negative-stem question - find the false statement. The claim that "a haematoma must be operated" is incorrect.
Step 2: Management of a haematoma depends on its location, size, and symptoms. Many small or asymptomatic haematomas need no intervention; superficial ones are managed conservatively with the RICE protocol (Rest, Ice, Compression, Elevation).
Step 3: Only selected symptomatic or critically located haematomas require surgical drainage, so surgery is not mandatory for every haematoma - making statement c false.
Step 4: The other statements are valid: imaging helps assess haemorrhage and the Glasgow Coma Scale (GCS) is a recognised prognostic tool in head injury. Hence the NOT correct option is c.