Acute Otitis Media — MCQs
All are intracranial complications of otitis media except which of the following?
Subdural empyema is a complication of all the following conditions except?
What are the X-ray findings associated with chronic otitis media?
American Heart Association standard pediatric dose of amoxicillin for antibiotic prophylaxis, in cases of endocarditis is
The treatment of choice for atticoantral variety of chronic suppurative otitis media is:
A 5-year-old child presents with reduced hearing for the past 2-3 months. Based on the otoscopy findings shown, what is the most likely diagnosis?
The preferred site of incision for myringotomy in ASOM (Acute Suppurative Otitis Media) to drain the middle ear is:
What is the treatment of choice for atticoantral type of chronic suppurative otitis media (CSOM)?
A patient presented with the following picture of Tympanic Membrane. Most Probable diagnosis (marked with arrow):
Light house sign is seen in ASOM in which stage?
Acute Otitis Media 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: Subdural empyema is a complication of all the following conditions except?
- A. Skull vault osteomyelitis
- B. Boil over face (Correct Answer)
- C. Frontal Sinusitis
- D. Middle ear disease
Explanation: The enriched explanation for the question is as follows: ***Boil over face*** - A **facial boil** (furuncle) is typically a superficial skin infection that, while potentially serious, is **less likely to directly lead to subdural empyema** compared to infections of deeper structures or bones adjacent to the brain. - While local spread is possible, the direct anatomical pathways for subdural involvement are not as pronounced as with other listed conditions. *Skull vault osteomyelitis* - **Osteomyelitis of the skull vault** can directly extend to the intracranial space, as the dura mater adheres closely to the inner table of the skull. [1] - Infection can erode through the bone, leading to a **subdural collection of pus**. *Frontal Sinusitis* - **Frontal sinusitis** is a common cause of subdural empyema, especially in adolescents and young adults, due to the thin posterior wall of the frontal sinus. [1] - The infection can spread through **direct extension** or via **valveless emissary veins** connecting the sinus mucosa to the intracranial venous system. *Middle ear disease* - **Chronic otitis media** and **mastoiditis** can lead to intracranial complications, including subdural empyema, through direct spread or via venous thrombophlebitis. - Infection can erode the tegmen tympani or mastoid air cells, allowing pus to collect in the **subdural space**.
Question 3: What are the X-ray findings associated with chronic otitis media?
- A. Honeycombing of mastoid
- B. Sclerosis with cavity in mastoid (Correct Answer)
- C. Clear-cut distinct bony partition between cells
- D. Increased pneumatization of mastoid cells
Explanation: ***Sclerosis with cavity in mastoid*** - Chronic otitis media leads to **long-standing inflammation** and **destruction** of the mastoid air cells, resulting in dense, **sclerotic bone** with cavity formation due to bone erosion. - This is the **characteristic X-ray finding** in chronic otitis media, indicating osseous remodeling and bone destruction from persistent infection. - The sclerosis represents reactive bone formation, while cavities form from **coalescence** of destroyed air cells. *Honeycombing of mastoid* - Honeycombing describes a **normal, well-pneumatized mastoid** with numerous small, distinct air cells visible on X-ray. - This appearance indicates a healthy mastoid bone with good aeration and is **inconsistent** with chronic inflammation. - Chronic otitis media causes bone remodeling and sclerosis, **not** preserved pneumatization. *Clear-cut distinct bony partition between cells* - This describes **normal mastoid anatomy** where air cells are well-defined and separated by thin, intact bony septa. - In chronic otitis media, these septa are typically **eroded or thickened** by inflammation, leading to loss of distinctness. - The inflammatory process causes destruction and sclerosis, **not** preservation of normal architecture. *Increased pneumatization of mastoid cells* - Increased pneumatization indicates **excessive air cell development**, which is opposite to the changes seen in chronic infection. - Chronic otitis media causes **destruction and sclerosis** of air cells, not increased pneumatization. - This would be seen in normal developmental variants, not chronic inflammatory disease.
Question 4: American Heart Association standard pediatric dose of amoxicillin for antibiotic prophylaxis, in cases of endocarditis is
- A. 20mg/kg
- B. 125mg/kg
- C. 100mg/kg
- D. 50mg/kg (Correct Answer)
Explanation: ***50mg/kg*** - The **American Heart Association (AHA)** guidelines recommend **50 mg/kg** of amoxicillin as the standard pediatric dose for antibiotic prophylaxis against infective endocarditis before certain dental procedures. - This dose is typically given orally, as a single dose, 30-60 minutes before the procedure. *20mg/kg* - This dose is lower than the recommended **AHA guideline** for infective endocarditis prophylaxis in children. - Administering this dose could result in **subtherapeutic levels**, failing to adequately prevent bacterial colonization and infection. *125mg/kg* - This dosage is significantly higher than the standard **AHA recommendation** for endocarditis prophylaxis. - Such a high dose could increase the risk of **adverse effects** without providing additional prophylactic benefit. *100mg/kg* - While higher than the standard 50mg/kg, this dose also exceeds the **AHA guidelines** for pediatric endocarditis prophylaxis. - Overdosing can lead to increased **gastrointestinal side effects** and other unwanted drug reactions.
Question 5: The treatment of choice for atticoantral variety of chronic suppurative otitis media is:
- A. Mastoidectomy (Correct Answer)
- B. Medical management
- C. Underlay myringoplasty
- D. Insertion of ventilation tube
Explanation: **Correct: Mastoidectomy** - The **atticoantral** variety of chronic suppurative otitis media (CSOM) is typically associated with **cholesteatoma**, which necessitates surgical eradication to prevent complications such as intracranial infection, facial nerve palsy, and labyrinthine destruction. - **Mastoidectomy** is the treatment of choice to remove the cholesteatoma and achieve a safe, dry ear by clearing disease from the mastoid air cells and attic. *Incorrect: Medical management* - This approach is typically used for the **tubotympanic** (mucosal/safe) type of CSOM, which involves a central perforation without cholesteatoma. - It is **ineffective in the presence of cholesteatoma**, as antibiotics cannot penetrate the keratinized debris matrix and do not eradicate the underlying pathology. *Incorrect: Underlay myringoplasty* - This procedure repairs a **tympanic membrane perforation** but does not address the underlying cholesteatoma or disease within the mastoid and attic. - It is used for **safe, dry perforations**, usually associated with the tubotympanic type of CSOM after the ear has been rendered inactive. *Incorrect: Insertion of ventilation tube* - Ventilation tubes (grommets) are primarily used for **recurrent acute otitis media** or **otitis media with effusion (glue ear)** to equalize middle ear pressure and facilitate drainage. - They are **not indicated for CSOM**, especially the atticoantral type with cholesteatoma, as they do not resolve the chronic infection or remove the pathological tissue.
Question 6: A 5-year-old child presents with reduced hearing for the past 2-3 months. Based on the otoscopy findings shown, what is the most likely diagnosis?
- A. Myringitis
- B. Otitis media with effusion (Correct Answer)
- C. Acute ear infection
- D. Air in the middle ear
Explanation: ***Otitis media with effusion*** - The image clearly shows the presence of **bubbles behind the tympanic membrane**, indicating fluid accumulation in the middle ear. - This fluid leads to **reduced hearing**, as reported in the 5-year-old child, consistent with otitis media with effusion (OME), also known as "glue ear." *Myringitis* - Myringitis typically presents with **inflammation of the tympanic membrane**, often with vesicles or bullae on the drum, which are not visible here. - While it can cause pain, it does not typically show the characteristic bubbles signifying middle ear effusion. *Acute ear infection* - An **acute otitis media** would show a **bulging, erythematous (red), and opaque tympanic membrane** due to inflammation and pus, which is not consistent with the image. - Systemic symptoms like fever and severe ear pain would also be expected with an acute infection. *Air in the middle ear* - The presence of **air in the middle ear is normal** and indicates a healthy, functioning Eustachian tube. - The visible bubbles in the image are consistent with **fluid and air-fluid levels**, not just air, and indicate a pathological condition affecting hearing.
Question 7: The preferred site of incision for myringotomy in ASOM (Acute Suppurative Otitis Media) to drain the middle ear is:
- A. Anteroinferior
- B. Posteroinferior (Correct Answer)
- C. Anterosuperior
- D. Posterosuperior
Explanation: ***Posteroinferior*** - The **posteroinferior quadrant** of the tympanic membrane is the preferred site for myringotomy in **acute suppurative otitis media (ASOM)** due to its relative avascularity and safety regarding middle ear structures. - This location allows for adequate drainage of pus and prevents re-accumulation, without damaging essential structures like the **ossicular chain** or the **facial nerve**. *Anteroinferior* - This quadrant is generally avoided because it provides less effective drainage and carries a higher risk of injury to the **Eustachian tube orifice** or other anterior structures. - The **handle of the malleus** runs posteriorly, and an incision here might be less effective for gravity-assisted drainage. *Anterosuperior* - The **anterosuperior quadrant** is not typically chosen due to its proximity to the **ossicular chain** attachments and potentially larger blood vessels, increasing the risk of bleeding and injury. - Incisions in this region are often less effective for draining fluids that tend to collect in the more dependent parts of the middle ear. *Posterosuperior* - While somewhat accessible, the **posterosuperior quadrant** carries a higher risk of damaging the **incus** and **stapes**, as well as the **facial nerve** or **chorda tympani nerve**. - Its elevated position also makes it less ideal for gravity-dependent drainage of purulent fluid from the middle ear.
Question 8: What is the treatment of choice for atticoantral type of chronic suppurative otitis media (CSOM)?
- A. Tympanoplasty
- B. Modified radical mastoidectomy (Correct Answer)
- C. None of the options
- D. Antibiotics
Explanation: ***Modified radical mastoidectomy*** - The **atticoantral type of CSOM** is characterized by active **cholesteatoma**, which requires surgical removal to prevent further bone erosion and complications. - A **modified radical mastoidectomy** is the treatment of choice as it removes the cholesteatoma and diseased mastoid air cells while aiming to preserve residual hearing. *Antibiotics* - While topical or systemic antibiotics may be used to control acute infections or discharge in CSOM, they do not eradicate **cholesteatoma**. - **Cholesteatoma** is an epidermoid cyst that requires surgical excision, as antibiotics alone cannot resolve it. *Tympanoplasty* - **Tympanoplasty** is primarily performed to reconstruct the tympanic membrane (eardrum) and/or the ossicular chain to restore hearing. - It is typically indicated for the **tubotympanic type of CSOM** (safe type) without cholesteatoma, not for the atticoantral type which involves cholesteatoma. *None of the options* - This option is incorrect because **modified radical mastoidectomy** is a well-established and necessary treatment for the atticoantral type of CSOM involving cholesteatoma.
Question 9: A patient presented with the following picture of Tympanic Membrane. Most Probable diagnosis (marked with arrow):
- A. Tubercular Otitis Media (Correct Answer)
- B. Syphilitic Otitis Media
- C. Pseudomonas infection
- D. Fungal Otitis Media
Explanation: ***Tubercular Otitis Media*** - The image exhibits **multiple perforations** in the tympanic membrane, along with **pale granulation tissue**, which are classic clinical features of **tubercular otitis media**. - Tubercular ear infections often present insidiously with **painless otorrhea** and **progressive hearing loss**, eventually leading to multiple perforations as the disease advances. *Syphilitic Otitis Media* - Syphilitic otitis media typically presents as **sensorineural hearing loss**, often sudden, and can be associated with **vestibular symptoms**. - It usually does **not cause multiple perforations** or extensive granulation tissue in the tympanic membrane. *Pseudomonas infection* - **Pseudomonas otitis externa** commonly causes severe pain, swelling, and purulent discharge, often seen in _elderly diabetic_ or _immunocompromised_ patients with potentially **malignant otitis externa**. - While *Pseudomonas* can cause chronic suppurative otitis media (CSOM) with a perforation, it doesn't typically lead to **multiple perforations** in the manner depicted. *Fungal Otitis Media* - Fungal otitis media (otomycosis) is characterized by the presence of **black, white, or yellow fungal debris** and hyphae within the external ear canal and on the tympanic membrane. - While it can cause inflammation and sometimes perforation, the image does not show characteristic **fungal elements** or the extensive **granulation tissue** typical of tubercular disease.
Question 10: Light house sign is seen in ASOM in which stage?
- A. Stage of suppuration (Correct Answer)
- B. Stage of hyperaemia
- C. Stage of resolution
- D. Stage of pre-suppuration
Explanation: ***Stage of suppuration*** - The **Light House sign** appears when there is sufficient pus within the **middle ear** to create a visible pulsation through a **perforation** in the tympanic membrane. - This pulsation resembles the flashing of a lighthouse, indicating the *presence of purulent exudate* and *active infection*. *Stage of hyperaemia* - This is the initial stage of **acute otitis media (AOM)**, characterized by **redness** and **swelling** of the tympanic membrane due to increased blood flow. - There is typically no **perforation** or **pus formation** at this stage, so the Light House sign would not be present. *Stage of resolution* - In this stage, the infection is subsiding, and inflammatory processes are resolving. - The **pus drains**, the perforation may close, and the tympanic membrane returns to a more normal appearance; thus, the **Light House sign** would no longer be visible. *Stage of pre-suppuration* - This stage follows hyperaemia and involves the **accumulation of exudate** (serous or mucoserous, not yet frankly purulent) in the middle ear space. - While fluid is present, it is not yet thick enough to cause the characteristic pulsating discharge associated with the **Light House sign**.
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