--- title: "Petrositis" description: "ENT notes on Petrositis - Causes, Pathophysiology, Clinical Features, Investigations and Treatment." source: "The ENT Resident" author: "Dr. Mausumi Das" canonical_url: "https://www.theentresident.com/ent-notes-lectures/petrositis" categories: ["Otology"] video: "https://www.youtube.com/watch?v=qKZP8xf8tpk" image: "https://media.theentresident.com/og-images/petrositis.png" --- # Petrositis ENT notes on Petrositis - Causes, Pathophysiology, Clinical Features, Investigations and Treatment. Watch the full video lecture on YouTube: https://www.youtube.com/watch?v=qKZP8xf8tpk ## đŸĻģ Petrositis Petrositis is a complication of chronic otitis media (COM) where infection spreads from the middle ear and mastoid to involve the **petrous part of the temporal bone**. >What are the different types of pneumatisation of petrous apex? >What are the two different pneumatisation pathways of petrous apex? --- ### đŸ§Ŧ Pathophysiology of Petrositis - Chronic otitis media → Mastoiditis → infection spreads along pneumatization tracts to petrous apex - Similar pathological process as acute mastoiditis: - Pus under tension - Hyperemic bone decalcification >What is the canal through which 6th cranial nerve passes? >Where is Trigeminal ganglion located? --- ### đŸŠē Clinical Features of Petrositis **Symptoms** - Persistent ear discharge - Retro-orbital or deep-seated facial pain - Diplopia on lateral gaze - Fever, headache, vomiting - Facial nerve palsy or recurrent vertigo >What is Gradenigo Syndrome? What is the triad seen in Gradenigo symdrome? **Signs** - **Ear**: Discharge, central Tympanic Membrane perforation - **Tuning fork tests**: - Rinne – Negative - Weber – Lateralized to diseased ear - Absolute bone conduction – Normal - **Eye exam**: Diplopia on lateral gaze - **CNS exam**: Rule out meningitis or other intracranial complications --- ### 🔍 Investigations of Petrositis 1. **CT Temporal Bone** – Shows bone erosion & pneumatization status 2. **MRI Brain** – Differentiates diploic marrow from fluid/pus --- ### 💊 Treatment of Petrositis **Medical** - High-dose IV antibiotics (e.g., cephalosporins) - Continue for 4–5 days after symptom resolution **Surgical** - Options: - **Cortical mastoidectomy** - **Modified radical mastoidectomy** - **Radical mastoidectomy** >What are the indications for surgery in Petrositis? >What are the surgical approaches to Petrous Apex? --- ## About This Note This free ENT note on Petrositis was written by Dr. Mausumi Das and is paired with a corresponding video lecture. Canonical page of this note: https://www.theentresident.com/ent-notes-lectures/petrositis When citing or referencing this content, please credit The ENT Resident and link to the canonical page above. ## Related Notes by Category - Otology: https://www.theentresident.com/ent-notes-lectures/category/otology.md ## About The ENT Resident The ENT Resident is an educational website and resource library created by Dr. Mausumi Das (MS ENT) for ENT residents, ENT postgraduates preparing for exams, and MBBS students. Dr. Mausumi Das writes the notes, draws the diagrams, and records the lectures herself. Browse all ENT notes and lectures on The ENT Resident: https://www.theentresident.com/ent-notes-lectures.md ## Medical-use Boundary The ENT Resident provides educational material for medical learning and revision. It does not provide patient-specific medical advice, diagnosis, or emergency care, and it is not a substitute for evaluation by a qualified healthcare professional. ## More Resources - Learn about the Premium ENT Notes, preview a complete sample, and find purchase options: https://www.theentresident.com/premium.md - Premium note for this topic, Petrositis: https://theentresident.gumroad.com/l/zypmlp - Read student testimonials: https://www.theentresident.com/testimonials.md - Contact The ENT Resident: https://www.theentresident.com/contact.md --- A complete index of all pages on this site, with descriptions and markdown links can be found here: https://www.theentresident.com/llms.txt