<s>[INST] context: Skull base is formed by Anterior cranial fossa Middle cranial fossa Posterior cranial fossa - Formed by frontal bone - Formed temporal & sphenoid bone - Formed by occipital bone Cribriform plate: Sieve like structure between anterior cranial fossa & nasal cavity Anterior cranial Fossa fracture Middle cranial fossa fracture Posterior cranial fossa fracture - MC type of skull base fracture - Caused by fracture of cribriform plate Clinical feature: - Subconjunctival hematoma - CSF rhinorrhea - Epistaxis - Peritoneal hematoma or "Raccoon eyes" - Carotico cavernous fistula - Frontal lobe contusion - Caused by fracture of petrous pa of temporal bone Clinical feature: - CSF otorrhea - Paradoxical rhinorrhea - Hemotympanum Battle sign: Bruising or ecchymosis behind ear - Ossicular disruption - VII & VIII cranial nerve palsies - Temporal lobe contusion - Caused by fracture of occipital bone Clinical features: - Visual disturbances - VI cranial nerve injury - Jugular foramen syndrome (Vernet syndrome): Paresis of IX, X, XI cranial nerves - Basilar aery injury - Occipital contusion [/INST] question: Battle's sign is presented in: | options: A: Anterior cranial fossa fracture B: Middle cranial fossa fracture C: Posterior cranial fossa fracture D: Fracture lesser wing of sphenoid | answer: B </s>