Complications of otitis media: from mastoiditis to brain abscess

Topic

Ear infections can spread to bone, inner ear, facial nerve, veins and brain; fever, headache or nerve palsy with otitis means hospital.

Updated Nov 12, 2026

See it in 3D: Sigmoid sinus · Transverse sinus · Facial nerve (VII) · Temporal bones

Key points

Extracranial: acute and coalescent mastoiditis, subperiosteal abscess (postauricular, zygomatic, Bezold, Citelli), petrositis (Gradenigo), labyrinthitis and labyrinthine fistula, facial palsy.
Intracranial: extradural abscess, subdural abscess (empyema), meningitis, brain abscess (temporal lobe or cerebellum), lateral (sigmoid) sinus thrombophlebitis, otitic hydrocephalus.
Meningitis is usually the most common intracranial complication; brain abscess is the most lethal.
Gradenigo syndrome: otorrhoea + deep facial or retro-orbital pain (trigeminal ganglion) + abducens palsy (sixth nerve at the petrous apex).
Lateral sinus thrombophlebitis: spiking «picket-fence» fever with rigors and Griesinger sign (oedema over the mastoid emissary vein); empty delta sign on contrast CT.
Otitic hydrocephalus: raised intracranial pressure (headache, papilloedema, sixth-nerve palsy) with normal CSF, usually from lateral sinus thrombosis; the ventricles are not dilated.

What it is

Acute and chronic otitis media can spread beyond the middle ear. Infection travels through bone eroded by cholesteatoma or osteitis, through preformed paths (congenital gaps, the oval and round windows, fractures, surgical defects) and along small veins that cross the bone. Complications are divided into extracranial ones (inside the temporal bone or in the soft tissues around it) and intracranial ones. Acute mastoiditis is the most common in children after acute otitis media; in adults, intracranial complications usually come from chronic otitis media with cholesteatoma (the atticoantral, «unsafe» type). Although antibiotics made them rare, mortality remains significant, so the exam message is simple: an ear infection plus fever, headache, vomiting, vertigo, facial weakness or neck stiffness needs contrast imaging, intravenous antibiotics and an ENT surgeon.

Key facts

Acute mastoiditis in a child: postauricular swelling, redness and tenderness, the pinna pushed forward and outward, loss of the postauricular groove, sagging of the posterosuperior canal wall.
Masked mastoiditis: partial antibiotic treatment hides the signs; persistent hearing loss, discharge or pain after an apparently treated otitis.
Labyrinthine fistula (circumscribed labyrinthitis): usually the lateral canal eroded by cholesteatoma; pressure in the canal causes vertigo (positive fistula test).
Serous labyrinthitis gives vertigo and partial, often reversible, sensorineural loss; suppurative labyrinthitis destroys the labyrinth (dead ear) and can spread to the meninges.
Facial palsy in acute otitis media (through a dehiscent facial canal) usually recovers with antibiotics and myringotomy; in chronic otitis media or cholesteatoma it needs early surgery.
Extradural abscess is often silent and found at surgery; persistent headache and fever on the side of the ear are the clues.
Subdural abscess spreads fast over the hemisphere: fever, seizures, focal deficits and falling consciousness; it is a neurosurgical emergency.
Otogenic brain abscess: temporal lobe (headache, vomiting, seizures, nominal aphasia if dominant, upper quadrant field defect) or cerebellum (ipsilateral ataxia, dysdiadochokinesia, nystagmus).
Lumbar puncture is avoided when an abscess or raised pressure is suspected until imaging rules out a mass, because of the risk of herniation.

Structure

Routes of spread: bone erosion (cholesteatoma, osteitis), preformed pathways (dehiscences, windows, fractures, surgery) and thrombophlebitis of small veins.
Intratemporal: mastoiditis (acute, coalescent, masked), petrositis, labyrinthitis (circumscribed with fistula, serous, suppurative), facial nerve palsy.
Extratemporal soft tissue: postauricular, zygomatic, Bezold (deep to the sternocleidomastoid) and Citelli (along the digastric) abscesses.
Intracranial: extradural abscess, subdural abscess, meningitis, brain abscess, lateral sinus thrombophlebitis, otitic hydrocephalus.
Microbiology: acute otitis media complications, pneumococcus, Haemophilus and group A streptococcus; chronic otitis media, Pseudomonas, Staphylococcus aureus, Proteus and anaerobes (often mixed).

Complications of otitis media at a glance

Complication	Group	Key clue	Main step
Acute mastoiditis	Extracranial	Postauricular swelling, pinna pushed forward	IV antibiotics, myringotomy; mastoidectomy if no response
Subperiosteal or Bezold abscess	Extracranial	Fluctuant swelling behind the ear or in the neck under the mastoid tip	Contrast CT, drainage and mastoidectomy
Petrositis (Gradenigo)	Extracranial	Retro-orbital pain + sixth-nerve palsy + otorrhoea	CT and MRI, IV antibiotics, surgery if needed
Labyrinthitis or fistula	Extracranial	Vertigo, sensorineural loss, positive fistula test	Antibiotics, steroids as indicated; surgery for cholesteatoma
Facial palsy	Extracranial	Facial weakness with otitis	Antibiotics, myringotomy (acute); surgery (chronic)
Extradural abscess	Intracranial	Persistent headache, often silent	Drainage during mastoidectomy
Subdural abscess	Intracranial	Seizures, focal deficit, drowsiness	Emergency neurosurgery
Meningitis	Intracranial	Neck stiffness, Kernig and Brudzinski signs	Antibiotics with CNS penetration, LP after imaging if needed
Brain abscess	Intracranial	Headache, vomiting, focal signs; ring-enhancing lesion	Neurosurgical drainage, long IV antibiotics, treat the ear
Lateral sinus thrombophlebitis	Intracranial	Picket-fence fever, Griesinger sign, empty delta	IV antibiotics, mastoidectomy; anticoagulation is debated
Otitic hydrocephalus	Intracranial	Headache, papilloedema, normal CSF	Treat sinus thrombosis, lower intracranial pressure

In clinical practice

Any ear infection with high fever, severe headache, vomiting, neck stiffness or drowsiness.
New vertigo, sensorineural hearing loss or facial weakness during otitis.
Swelling behind or above the ear, or a neck swelling under the mastoid tip.
Diplopia (sixth-nerve palsy) or deep pain behind the eye with a discharging ear.
Foul, scanty discharge with an attic perforation that suddenly becomes painful.

Next step / Initial management

First workup: full ENT and neurological exam, blood count and inflammatory markers, blood cultures, ear swab; contrast CT of the temporal bone and brain, MRI with MR venography for intracranial or venous complications.
First-line management: admission and intravenous broad-spectrum antibiotics with CNS penetration (for example a third-generation cephalosporin, with metronidazole for chronic otitis or abscess), analgesia, hydration; adjust to cultures.
Surgery by ENT: myringotomy with or without a tube in acute otitis, cortical mastoidectomy for mastoiditis that fails or for abscess, canal-wall-down surgery for cholesteatoma; neurosurgery drains brain or subdural abscesses.
Colombia (AIEPI): a child with painful swelling behind the ear is classified as mastoiditis; give the first dose of an appropriate antibiotic and refer urgently to hospital, following stabilisation and transport rules.
Refer the same day (emergency) every patient with otitis and any extracranial or intracranial warning sign; routine ENT referral for chronic discharge so cholesteatoma is treated before complications.

Test yourself

Think of the answer, then tap the question to see it.

A child has otorrhoea, severe pain behind the right eye and cannot abduct that eye. Which syndrome is this, and where is the lesion?

Gradenigo syndrome from petrous apicitis: the trigeminal ganglion and the sixth nerve (in Dorello canal) lie at the petrous apex.

A man with chronic otitis has spiking fever with rigors, oedema over the mastoid and an empty delta sign on contrast CT. Diagnosis?

Lateral (sigmoid) sinus thrombophlebitis: IV antibiotics and mastoidectomy, with neurosurgical and haematology input on anticoagulation.

What is the most common intracranial complication of otitis media, and which is the most lethal?

Meningitis is usually the most common; brain abscess is the most lethal.

A 3-year-old with otitis has a fluctuant swelling behind the ear, with the pinna pushed forward. What is the next step in Colombia's AIEPI?

Classify as mastoiditis: give the first dose of an appropriate antibiotic and refer urgently to hospital for contrast CT, IV antibiotics and drainage or mastoidectomy.

A patient with mastoiditis has a tender swelling in the upper neck deep to the sternocleidomastoid. What is it?

A Bezold abscess: pus that broke through the medial side of the mastoid tip; contrast CT, drainage and mastoidectomy.

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Educational content; it does not replace a medical assessment and is not a clinical instruction. For a real case, follow current guidelines and specialist advice.

Sources: Mastoiditis (StatPearls Publishing (NCBI Bookshelf), 2023); Bezold Abscess (StatPearls Publishing (NCBI Bookshelf), 2023); Labyrinthitis (StatPearls Publishing (NCBI Bookshelf), 2025); Brain Abscess (StatPearls Publishing (NCBI Bookshelf), 2024); Subdural Empyema (StatPearls Publishing (NCBI Bookshelf), 2024); Cerebral Venous Sinus Thrombosis (StatPearls Publishing (NCBI Bookshelf), 2025); Chronic Suppurative Otitis (StatPearls Publishing (NCBI Bookshelf), 2026); The diagnosis, management, and outcomes of Gradenigo syndrome in children: a scoping review (Diagnostics) (Diagnostics (PubMed), 2025); Intracranial complications of otitis media: 15 years of experience in 33 patients (Otolaryngol Head Neck Surg) (Otolaryngology–Head and Neck Surgery (PubMed), 2005); Cuadro de procedimientos: Atención Integrada a las Enfermedades Prevalentes de la Infancia (AIEPI) (Ministerio de Salud y Protección Social, Colombia, 2018).

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