<prompt> A 20 year old male come to casuality with head injury. Examination reveals normal counsciousness, clinically normal and blood in the tympanic membrane, most likely cause isExtradural haemorrhageSubdural haemorrhageIntraventricular haemorrhageComplete basilar fracture  <response>: Complete basilar fracture 595 - 99- B L 24th 302-Baily Love 25thExtradural haemorrhage - Common in younger age group Usually from haemorrhage of middle meningeal artery Lucid interval is characteristic Surgery without delay is essentialSubdural haematoma - most common intracranial mass lesions resulting from head trauma Develop from tom bridging veins or cortical lacerations More severe poorer out come CT - concave hyperdense collectionsBase of skull fracturesAnterior Cranial Fossa FractureMiddle Cranial Fossa Fracture Sub conjunctival haematoma CSF rhinorrhoea Carotico-cavemous fistula Periorbital haematoma or raccoon eyes CSF otorrhoea or rhinorrhoea Haemotympanum Ossicular disruption Battle sign brushing behind the ear VII and VIII cranial nerve palsies 