--- title: "Gradenigo Syndrome" description: "Understand the triad in Grdaenigo syndrome - ideal for MBBS and ENT students." source: "The ENT Resident" canonical_url: "https://www.theentresident.com/ent-notes-lectures/gradenigo-syndrome" categories: ["Otology", "Short Questions in ENT", "Mnemonics in ENT", "Signs, Syndromes, Triads, and Compilation Lists in ENT"] video: "https://www.youtube.com/watch?v=IotkWaaEo2s" image: "https://media.theentresident.com/og-images/gradenigo-syndrome.png" --- # Gradenigo Syndrome Understand the triad in Grdaenigo syndrome - ideal for MBBS and ENT students. Watch the full video lecture on YouTube: https://www.youtube.com/watch?v=IotkWaaEo2s ## 🧠 Gradenigo’s Syndrome ### 📌 Definition of Gradenigo’s Syndrome A rare complication of **acute or chronic otitis media** characterized by a **classical triad** due to involvement of cranial nerves near the petrous apex. --- ### 🧠 Classical Triad of Gradenigo’s Syndrome **Mnemonic:** **EAR** - **E** – **E**ar discharge - **A** – **A**bducens (VI) nerve palsy - **R** – **R**etro-orbital/facial pain First described by Giuseppe Gradenigo, 1904. >When should you suspect Gradenigo syndrome? --- ### 🔬 Pathophysiology of Gradenigo’s Syndrome 1. Otitis media (acute or chronic) → mastoiditis 2. Spread to petrous apex via: - **Posterior superior air cell tract** - **Anteroinferior cell tract** 3. Involvement of: - **Trigeminal ganglion** → retro-orbital pain - **Abducens nerve in Dorello’s canal** → diplopia 4. Possible intracranial spread → meningitis, venous sinus thrombosis --- ## 🦠 Etiology of Gradenigo’s Syndrome - Complication of **acute or chronic otitis media** with **petrositis** >What are the risk factors of Gradenigo's syndrome? --- ### 🧪 Investigations of Gradenigo’s Syndrome **1️⃣ MRI Brain** - Petrous apex inflammation - Cranial nerve enhancement - Soft tissue changes **2️⃣ CT Temporal Bone** - Bony erosion - Petrous apex pneumatization - Mastoid air cell involvement >What is the gold standard investigation in Gradenigo's Syndrome? --- ## 💊 Treatment of Gradenigo’s Syndrome **Medical (First-line)** - **IV antibiotics** 4–6 weeks - Analgesics - Steroids (cautiously) for cranial nerve inflammation >Which antibiotic is preferred in Gradenigo's syndrome? **Surgical (if medical fails or complications present)** - Mastoidectomy - Petrous apex drainage >What are the different surgical approaches to Petrous Apex? --- ### ⚠️ Complications of Gradenigo’s Syndrome - Meningitis - Brain abscess - Lateral sinus thrombosis - Sepsis - Permanent cranial nerve deficits --- ### 📈 Prognosis of Gradenigo’s Syndrome - **Good** if diagnosed and treated early - Cranial nerve deficits often **reverse** with treatment --- ## About This Note This note on Gradenigo Syndrome is one of the free ENT study notes published by The ENT Resident. It is free to read on the website, and it is paired with a full video lecture on YouTube. This note is categorized under [Otology](https://www.theentresident.com/ent-notes-lectures/category/otology.md), [Short Questions in ENT](https://www.theentresident.com/ent-notes-lectures/category/short-questions-in-ent.md), [Mnemonics in ENT](https://www.theentresident.com/ent-notes-lectures/category/mnemonics-in-ent.md), and [Signs, Syndromes, Triads, and Compilation Lists in ENT](https://www.theentresident.com/ent-notes-lectures/category/signs-syndromes-triads-lists-in-ent.md). Each category page lists all the free ENT notes on that topic. 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Other contact options are on the contact page: https://www.theentresident.com/contact.md ## Related ENT Notes & Lectures #### Otology - [Abscesses in relation to Mastoid](https://www.theentresident.com/ent-notes-lectures/mastoid-abscess-bezold-citelli.md) - [Acute Mastoiditis VS Furunculosis](https://www.theentresident.com/ent-notes-lectures/acute-mastoiditis-furunculosis.md) - [Acute Necrotizing Otitis Media](https://www.theentresident.com/ent-notes-lectures/acute-necrotizing-otitis-media.md) - [Acute Otitis Media - Causes, Symptoms and Treatment](https://www.theentresident.com/ent-notes-lectures/acute-otitis-media-symptoms-treatment.md) - [Anatomy of External Ear](https://www.theentresident.com/ent-notes-lectures/external-ear-anatomy.md) - [Anatomy of Facial Nerve](https://www.theentresident.com/ent-notes-lectures/facial-nerve-anatomy.md) - [Anatomy of Facial Nerve – Branches](https://www.theentresident.com/ent-notes-lectures/facial-nerve-branches.md) - [Anatomy of Facial Nerve – Functional Components](https://www.theentresident.com/ent-notes-lectures/facial-nerve-functional-components.md) - 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[Otosclerosis Part 2 - Symptoms, Signs, Investigations, Differential diagnosis](https://www.theentresident.com/ent-notes-lectures/otosclerosis-symptoms-signs-differential.md) - [Otosclerosis Part 3 - Treatment](https://www.theentresident.com/ent-notes-lectures/otosclerosis-treatment-surgery-stapedotomy.md) - [Otosclerosis Signs Explained | Schwartz sign, Carhart’s notch, Halo sign, Paracusis willisii](https://www.theentresident.com/ent-notes-lectures/otosclerosis-schwartz-carhart-notch-paracusis-willisii.md) - [Perichondritis - Boxer’s Ear / Cauliflower Ear](https://www.theentresident.com/ent-notes-lectures/perichondritis-pinna-boxer-cauliflower-ear.md) - [Petrositis](https://www.theentresident.com/ent-notes-lectures/petrositis.md) - [Radical Mastoidectomy](https://www.theentresident.com/ent-notes-lectures/radical-mastoidectomy.md) - [Referred Pain in the Ear](https://www.theentresident.com/ent-notes-lectures/referred-pain-ear.md) - [Sade Classification - Pars Tensa Retraction](https://www.theentresident.com/ent-notes-lectures/sade-classification.md) - 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[Layers of Pharynx](https://www.theentresident.com/ent-notes-lectures/layers-of-pharynx.md) - [Lymphatic Drainage of Tongue](https://www.theentresident.com/ent-notes-lectures/lymphatic-drainage-tongue.md) - [Nerve Supply of Tongue](https://www.theentresident.com/ent-notes-lectures/nerve-supply-tongue.md) - [Organ of Corti – Anatomy, Structure and Clinical Relevance](https://www.theentresident.com/ent-notes-lectures/organ-of-corti.md) - [Paradise Criteria for Tonsillectomy](https://www.theentresident.com/ent-notes-lectures/paradise-criteria-tonsillectomy.md) - [Post Tonsillectomy Hemorrhage - Primary, Reactionary and Secondary Hemorrhage](https://www.theentresident.com/ent-notes-lectures/post-tonsillectomy-hemorrhage-reactionary-secondary.md) - [Recurrent Laryngeal Nerve Course - Why is it different on both sides?](https://www.theentresident.com/ent-notes-lectures/recurrent-laryngeal-nerve-different-course.md) - [Referred Pain in the Ear](https://www.theentresident.com/ent-notes-lectures/referred-pain-ear.md) - 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[Triangles in Thyroid Surgery](https://www.theentresident.com/ent-notes-lectures/triangles-in-thyroid-surgery.md) #### Signs, Syndromes, Triads, and Compilation Lists in ENT - [Glomus Tumor Signs Explained | Aquino Sign, Brown Sign, Phelps Sign & Rising Sun Sign](https://www.theentresident.com/ent-notes-lectures/rising-sun-phelp-brown-aquino-sign-glomus-tumor.md) - [Guttman Sign Explained | Nose, Larynx and Thyroid](https://www.theentresident.com/ent-notes-lectures/guttman-sign-thyroid-larynx-nose.md) - [Halo Sign Explained in ENT](https://www.theentresident.com/ent-notes-lectures/halo-sign-csf-leak-otosclerosis.md) - [Ice Cream Cone Sign Explained in ENT](https://www.theentresident.com/ent-notes-lectures/ice-cream-cone-sign-ent.md) - [JNA Signs Explained | Holman Miller Sign, Chopstick Sign, Hondousa Sign, Ram Haran Sign](https://www.theentresident.com/ent-notes-lectures/jna-holman-miller-chopsticks-hondousa-ramharan-sign.md) - [Otosclerosis Signs Explained | Schwartz sign, Carhart’s notch, Halo sign, Paracusis willisii](https://www.theentresident.com/ent-notes-lectures/otosclerosis-schwartz-carhart-notch-paracusis-willisii.md) - [Steeple Sign, Thumb Sign & Tripod Sign Explained | Croup vs Epiglottitis](https://www.theentresident.com/ent-notes-lectures/steeple-croup-thumb-tripod-sign-epiglottitis.md)