Intracranial Complications of Sinusitis — MCQs

10 questions

All are intracranial complications of otitis media except which of the following?

A 9 year old boy with Fallot's tetralogy, had high grade fever followed by focal seizure 2 days prior to hospital admission. His blood counts were increased and predominantly polymorphs. CT scan of the head showed a focal lesion suggestive of an abscess. Where would be the commonest location of brain abscess in this patient?

All are major symptoms of sinusitis except?

All of the following statements are true regarding cavernous sinus thrombosis EXCEPT:

Neurological complications of meningitis include all of the following except:

A young man following RTA presented with proptosis and pain in the right eye after four days. On examination, there is periorbital ecchymosis on the forehead and right eye. What is the diagnosis -

In benign intracranial hypertension-

Tobey-Ayer test is positive in which of the following conditions?

All are complications of vacuum-assisted delivery over forceps delivery except:

Q10

In a small child diagnosed with H. influenzae meningitis, what investigation must be done before discharging him from the hospital?

Intracranial Complications of Sinusitis Indian Medical PG Practice Questions and MCQs

Question 1: All are intracranial complications of otitis media except which of the following?

A. Brain abscess
B. Hydrocephalus
C. Lateral sinus thrombophlebitis
D. Facial nerve palsy (Correct Answer)

Explanation: ***Facial nerve palsy*** - This is an **extracranial complication** of otitis media affecting the **facial nerve within the temporal bone**, not an intracranial structure. - The facial nerve (CN VII) runs through the **fallopian canal** in the temporal bone and can be affected by inflammation from adjacent mastoid or middle ear infection. - Classified as a **temporal bone complication** rather than an intracranial complication. *Lateral sinus thrombophlebitis* - This is a true **intracranial complication** involving thrombosis of the **sigmoid and lateral venous sinuses** within the cranial cavity. - Results from direct extension of infection through the **mastoid tegmen** or via septic thrombophlebitis. - Presents with features of sepsis, headache, and papilledema. *Brain abscess* - A severe **intracranial complication** representing focal suppurative infection within the **brain parenchyma** (commonly temporal lobe or cerebellum). - Occurs through direct extension via bony erosion, retrograde thrombophlebitis, or hematogenous spread. - Requires urgent neurosurgical intervention. *Hydrocephalus* - An **intracranial complication** that can occur secondary to **otogenic meningitis** or **lateral sinus thrombosis**. - Results from impaired CSF absorption or obstruction of CSF pathways. - More common in pediatric otitis media with CNS complications.

Question 2: A 9 year old boy with Fallot's tetralogy, had high grade fever followed by focal seizure 2 days prior to hospital admission. His blood counts were increased and predominantly polymorphs. CT scan of the head showed a focal lesion suggestive of an abscess. Where would be the commonest location of brain abscess in this patient?

A. Parietal lobe
B. Cerebellum (Correct Answer)
C. Temporal lobe
D. Thalamus

Explanation: **Cerebellum** - In patients with **cyanotic congenital heart disease** like Fallot's tetralogy, brain abscesses are typically supplied by the **posterior circulation**, making the **cerebellum** the most common location. [1] - The **right-to-left shunt** allows bacteria to bypass pulmonary filtration and directly enter systemic circulation, increasing the risk of infection in the brain, predominantly in areas supplied by the vertebral and basilar arteries. [1], [3] *Parietal lobe* - While brain abscesses can occur in the parietal lobe, it is more commonly associated with spread from a **frontal or sphenoid sinusitis** or direct trauma, not typically from cyanotic heart disease. - Abscesses in the parietal lobe are more often seen in **immunocompromised patients** or those with endocarditis causing septic emboli. [2] *Temporal lobe* - Temporal lobe abscesses are frequently a complication of **otitis media** or **mastoiditis**, with infection spreading directly or via venous drainage. - This patient's presentation does not suggest an ear infection as the primary source. *Thalamus* - Thalamic abscesses are rare and usually occur as a result of **hematogenous spread** from distant infections, particularly in immunocompromised individuals. - While possible, they are not the most common location for brain abscesses in patients with cyanotic congenital heart disease.

Question 3: All are major symptoms of sinusitis except?

A. Nasal blockage
B. Facial congestion
C. Halitosis (Correct Answer)
D. Anosmia

Explanation: ***Halitosis*** - While **halitosis** (bad breath) can be a symptom associated with sinusitis due to post-nasal drip and bacterial overgrowth, it is generally considered a **minor symptom** or a secondary effect rather than one of the primary, defining features. - Major symptoms focus on those directly caused by inflammation and obstruction of the sinuses. *Nasal blockage* - **Nasal blockage** or congestion is a cardinal symptom of sinusitis, resulting from inflammation and swelling of the nasal and sinus mucosa. - It often leads to difficulty breathing through the nose and contributes to a feeling of fullness. *Facial congestion* - **Facial congestion** or pressure is a key symptom of sinusitis, caused by the buildup of fluid and inflammation within the sinus cavities. - This symptom can manifest as pain or pressure around the eyes, cheeks, and forehead. *Anosmia* - **Anosmia**, or the loss of smell, is a significant symptom of sinusitis, particularly chronic sinusitis. - It occurs due to the inflammation and obstruction of the nasal passages, preventing odorants from reaching the olfactory receptors.

Question 4: All of the following statements are true regarding cavernous sinus thrombosis EXCEPT:

A. Loss of jaw jerk (Correct Answer)
B. Loss of sensation around the eye
C. Sphenoid sinusitis is the most common cause
D. Inferior ophthalmic vein can spread infection from dangerous area of face

Explanation: ***Loss of jaw jerk*** - The **jaw jerk reflex** is mediated by the **trigeminal nerve (V3)** and its mesencephalic nucleus, which lies within the brainstem, superior to the cavernous sinus. - Cavernous sinus thrombosis primarily affects structures passing *through* or *adjacent* to the sinus, predominantly **cranial nerves III, IV, V1, V2, and VI**, but typically does not directly impact the brainstem structures responsible for the jaw jerk reflex in its localized progression. *Inferior ophthalmic vein can spread infection from dangerous area of face* - The **inferior ophthalmic vein** drains into the **cavernous sinus**, providing a direct route for infection from the **"dangerous area" of the face** (e.g., upper lip, nose, medial canthus). - This venous connection allows pathogens to enter the cavernous sinus and cause **thrombosis**. *Sphenoid sinusitis is the most common cause* - **Sphenoid sinusitis** is a common cause of **cavernous sinus thrombosis** due to the close anatomical proximity of the sphenoid sinuses to the cavernous sinuses. - Inflammation and infection in the sphenoid sinus can easily spread directly into the adjacent cavernous sinus. *Loss of sensation around the eye* - The **ophthalmic division (V1)** of the trigeminal nerve passes through the **cavernous sinus** and provides sensation to the forehead, upper eyelid, and **area around the eye**. - Compression or involvement of V1 due to thrombosis can result in **sensory deficits** in this distribution.

Question 5: Neurological complications of meningitis include all of the following except:

A. Increased intracranial pressure
B. Brain abscess
C. Subdural effusions
D. Cerebral hamartoma (Correct Answer)

Explanation: Cerebral hamartoma - A cerebral hamartoma is a benign, tumor-like malformation of abnormally organized mature brain tissue; it is a developmental anomaly and not a complication of meningitis. - Unlike the other options, it does not represent an inflammatory, infectious, or pressure-related sequela of meningeal infection. Increased intracranial pressure - Increased intracranial pressure (ICP) is a common and serious complication of meningitis due to cerebral edema, hydrocephalus, or vasodilation. - Elevated ICP can lead to herniation, neurological deficits, and even death if not managed promptly. Brain abscess - A brain abscess is a localized collection of pus within the brain parenchyma that can develop as a focal complication of bacterial meningitis, particularly in cases of hematogenous spread or direct extension of infection [1]. - This serious condition causes focal neurological deficits and requires aggressive treatment. Subdural effusions - Subdural effusions are accumulations of sterile or infected fluid in the subdural space, most commonly seen in infants and young children with bacterial meningitis. - While they can be asymptomatic, large effusions may cause increased ICP or focal neurological signs requiring drainage.

Question 6: A young man following RTA presented with proptosis and pain in the right eye after four days. On examination, there is periorbital ecchymosis on the forehead and right eye. What is the diagnosis -

A. Internal carotid artery aneurysm
B. Fracture of sphenoid
C. Carotico-cavernous fistula (Correct Answer)
D. Cavernous sinus thrombosis

Explanation: ***Carotico-cavernous fistula*** - A carotico-cavernous fistula (CCF) following trauma, such as a **road traffic accident (RTA)**, is characterized by a direct connection between the **internal carotid artery** and the **cavernous sinus**. - **Key diagnostic feature**: CCF typically presents with a **delayed onset (3-5 days post-trauma)**, which matches this patient's 4-day timeline perfectly. - This leads to arterial blood flowing into the venous system, causing symptoms like **proptosis**, **pain**, chemosis (conjunctival congestion), and **periorbital ecchymosis** due to venous congestion and orbital swelling. - Additional classic features include pulsating exophthalmos, orbital bruit, and conjunctival injection. *Internal carotid artery aneurysm* - An internal carotid artery (ICA) aneurysm can cause symptoms due to compression of adjacent structures (e.g., cranial nerves) or rupture. - While it can occur post-trauma, it typically does not directly lead to the rapid onset of **proptosis** and orbital congestion seen in this case without rupture into the cavernous sinus, which would then become a CCF. - ICA aneurysms usually present with cranial nerve palsies or headache rather than isolated proptosis. *Fracture of sphenoid* - A sphenoid fracture can produce various neurological deficits depending on the fracture's location and extent, potentially involving cranial nerves, optic chiasm, or internal carotid artery. - However, isolated sphenoid fractures are less likely to cause **progressive proptosis** developing over days without other signs like vision loss, diplopia, or CSF leakage. - The **delayed presentation** argues against a simple fracture and suggests a vascular complication like CCF. *Cavernous sinus thrombosis* - Cavernous sinus thrombosis (CST) is usually caused by an **infection** (e.g., from sinusitis, facial cellulitis) and presents with fever, severe headache, and characteristic cranial nerve palsies (**III, IV, V1, V2, VI**), often bilateral. - While CST can cause **proptosis** and orbital pain, the absence of fever and infectious signs, along with the **traumatic history**, makes CCF a more probable diagnosis. - CST typically has a more acute presentation (hours to 1-2 days) compared to the 4-day delay seen here.

Question 7: In benign intracranial hypertension-

A. Brain scan is not required in young women as sagittal sinus thrombosis is rare
B. There is a restriction of upgaze
C. Normal or small ventricles are characteristic findings (Correct Answer)
D. Optic nerve fenestration is one of the treatment options that should be considered early to prevent vision loss in benign intracranial hypertension

Explanation: ***Normal or small ventricles are characteristic findings*** - In benign intracranial hypertension (BIH/IIH), the **intracranial pressure (ICP) is elevated without a mass lesion or obstructive hydrocephalus**, resulting in **normal-sized or small ventricles** on imaging. - This is a **hallmark feature** of the condition and helps distinguish it from hydrocephalus where ventricles would be enlarged. - The presence of normal ventricles with elevated ICP and papilledema forms part of the **modified Dandy criteria** for diagnosing IIH. *Brain scan is not required in young women as sagittal sinus thrombosis is rare* - This is **incorrect** - brain imaging, particularly **MRI with MR venography (MRV)**, is **essential** in all cases of suspected BIH to exclude cerebral venous sinus thrombosis (CVST). - CVST is an important **secondary cause** of elevated ICP that can mimic IIH and is particularly relevant in young women (who are also the typical demographic for IIH). - **Excluding CVST and other secondary causes** is mandatory before diagnosing idiopathic intracranial hypertension. *There is a restriction of upgaze* - **Restriction of upgaze** is characteristic of **Parinaud's syndrome** (dorsal midbrain syndrome), typically caused by lesions affecting the superior colliculi (e.g., pineal region tumors). - BIH commonly causes **horizontal diplopia** from **sixth nerve palsy** (abducens nerve palsy) due to elevated ICP, but not upgaze restriction. *Optic nerve fenestration is one of the treatment options that should be considered early to prevent vision loss in benign intracranial hypertension* - This is **incorrect** - **optic nerve sheath fenestration (ONSF)** is a surgical procedure reserved for cases with **progressive vision loss despite maximal medical therapy**. - **First-line treatment** includes weight loss and **acetazolamide** (carbonic anhydrase inhibitor). - ONSF is a **late-stage intervention**, not an early treatment option, used when vision is severely threatened despite medical management.

Question 8: Tobey-Ayer test is positive in which of the following conditions?

A. Lateral sinus thrombosis (Correct Answer)
B. Subarachnoid haemorrhage
C. Petrositis
D. Cerebral abscess

Explanation: ***Lateral sinus thrombosis*** - The **Tobey-Ayer test** (or Queckenstedt's maneuver) assesses the patency of the **internal jugular vein** by observing changes in CSF pressure during compression. - In **lateral sinus thrombosis**, compression of the unaffected internal jugular vein leads to a rise in CSF pressure, but compression of the affected side yields **no or a blunted rise**, indicating obstruction. *Subarachnoid haemorrhage* - This condition involves bleeding into the subarachnoid space, which can elevate **intracranial pressure (ICP)**, but it isn't directly diagnosed by a differential CSF pressure response to jugular compression. - The primary diagnostic methods are **CT scans** and **lumbar puncture** showing xanthochromia. *Petrositis* - Also known as Gradenigo's syndrome, petrositis is an infection of the **petrous apex** of the temporal bone, often presenting with ear discharge, facial pain, and abducens nerve palsy. - While it's a complication of otitis media, it does not typically involve obstruction of the internal jugular vein or present with a positive Tobey-Ayer test. *Cerebral abscess* - A cerebral abscess is a localized collection of pus within the brain parenchyma, which can cause **localized neurological deficits** and increased ICP. - The Tobey-Ayer test would not specifically diagnose a cerebral abscess, as it assesses venous outflow from the brain rather than focal brain lesions.

Question 9: All are complications of vacuum-assisted delivery over forceps delivery except:

A. Subgaleal hematoma
B. Intracranial hemorrhage
C. Cephalohematoma
D. Transient lateral rectus palsy (Correct Answer)

Explanation: ***Transient lateral rectus palsy*** - **Transient sixth nerve palsy** (lateral rectus palsy) in a neonate is **more commonly associated with forceps delivery**, not vacuum-assisted delivery. - This occurs due to **direct compression of the fetal head** during forceps application, particularly compression of the sixth cranial nerve [4]. - It is **NOT a typical complication of vacuum-assisted delivery over forceps delivery**, making it the correct answer to this EXCEPT question. *Subgaleal hematoma* - This is a **serious and specific complication of vacuum-assisted delivery**, occurring when blood collects in the space between the **galeal aponeurosis** and the **periosteum** [1]. - It is **more common with vacuum extraction than forceps delivery**. - Can lead to significant **blood loss** and **hypovolemic shock** in the neonate. *Intracranial hemorrhage* - **Vacuum extraction is associated with higher rates** of intracranial hemorrhage compared to forceps delivery [1]. - The suction and traction forces can lead to **subdural hemorrhage**, **subarachnoid hemorrhage**, and other intracranial bleeding [2]. - Studies show increased risk with vacuum compared to forceps delivery. *Cephalohematoma* - A **cephalohematoma** (blood collection between **periosteum** and skull bone) is a **classic and common complication of vacuum-assisted delivery** [3]. - It is **more frequent with vacuum extraction than forceps delivery** due to the suction cup causing subperiosteal bleeding. - Resolves spontaneously over weeks to months.

Question 10: In a small child diagnosed with H. influenzae meningitis, what investigation must be done before discharging him from the hospital?

A. Hearing assessment (Correct Answer)
B. CT scan
C. X-ray skull
D. MRI

Explanation: ***Hearing assessment*** - **Sensorineural hearing loss** is a significant and common complication of *H. influenzae* meningitis, occurring in up to 30% of children. - Early detection through a **hearing assessment** is crucial for intervention and to minimize long-term developmental impact. *CT scan* - A CT scan is typically performed during the acute phase of meningitis to rule out complications like **hydrocephalus** or **brain abscess**, not routinely before discharge for long-term sequelae. - While it can identify structural abnormalities, it does not directly assess **auditory function**. *X-ray skull* - An X-ray of the skull has very limited utility in the diagnosis or follow-up of meningitis. - It does not provide information about brain pathology or potential **hearing damage**. *MRI* - MRI is a more sensitive imaging modality than CT for detecting subtle brain parenchymal changes and is sometimes used in complicated cases of meningitis. - However, like CT, it is not the primary investigation required to assess for **hearing loss** as a post-meningitis sequela before discharge.

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