Otology Practice Questions

Q: An 8-year-old boy presented with a severe infection of the right middle ear. Within a week, the infection spread to the mastoid antrum and mastoid air cells. Despite antibiotic treatment, the organisms did not respond, leading the surgeon to perform a radical mastoid operation. Postoperatively, the boy's face became distorted: his mouth was drawn upward to the left, and he was unable to close his right eye. Saliva accumulated in his right cheek and dribbled from the corner of his mouth. What structure was most likely damaged during the operation?

Facial nerve. ### Explanation **1. Why the Correct Answer is Right:** The patient is presenting with classic signs of **Lower Motor Neuron (LMN) Facial Nerve (CN VII) Palsy**. The facial nerve has a long and tortuous course through the temporal bone, specifically within the **Fallopian canal**. During a radical mastoidectomy, the nerve is highly vulnerable to injury, particularly in its **tympanic (horizontal)** and **mastoid (vertical)** segments. * **Clinical Correlation:** The inability to close the right eye (paralysis of *orbicularis oculi*), the mouth being drawn to the healthy (left) side due to unopposed muscle action, and the accumulation of saliva/food in the cheek (paralysis of *buccinator*) are hallmark signs of facial nerve damage. **2. Why the Incorrect Options are Wrong:** * **A. Mandibular Nerve (V3):** This nerve supplies the muscles of mastication. While it controls jaw movement, it does not control facial expression or eye closure. * **B. Parotid Duct:** Injury to the Stensen’s duct would lead to a salivary fistula or swelling, but it would not cause motor paralysis of the facial muscles. * **C. Vagus Nerve (X):** Damage to the vagus nerve would result in dysphagia, hoarseness (vocal cord paralysis), or loss of the gag reflex, none of which are present here. **3. NEET-PG High-Yield Pearls:** * **Most common site of facial nerve injury** during mastoid surgery is the **second genu**, just distal to the horizontal semicircular canal. * **Dehiscence of the Fallopian canal** (most common in the tympanic segment) increases the risk of nerve injury during middle ear surgery. * **Bell’s Phenomenon:** The upward and outward rolling of the eyeball when the patient attempts to close the eyelid (seen in LMN facial palsy). * **House-Brackmann Scale:** Used to grade the severity of facial nerve paralysis (Grade I is normal; Grade VI is total paralysis).

Q: Which surgical procedure is most preferred in the management of otosclerosis?

Stapedotomy. **Explanation:** **Otosclerosis** is a primary metabolic bone disease of the otic capsule characterized by bony resorption and subsequent formation of mature lamellar bone, leading to fixation of the stapes footplate and conductive hearing loss. **Why Stapedotomy is the Correct Answer:** Currently, **Small-hole Stapedotomy** is the gold standard surgical treatment. Unlike a stapedectomy, where the entire footplate is removed, a stapedotomy involves creating a tiny opening (fenestra) in the footplate (usually using a micro-drill or laser) and placing a piston-style prosthesis. * **Advantages:** It offers better high-frequency hearing results, carries a lower risk of post-operative vertigo, and significantly reduces the risk of "dead ear" (sensorineural hearing loss) by minimizing trauma to the inner ear. **Analysis of Incorrect Options:** * **A. Stapedectomy:** This involves total or partial removal of the stapes footplate. While effective, it is more invasive and associated with a higher incidence of inner ear complications compared to stapedotomy. * **B. Fenestration:** An obsolete procedure (Lempert’s) where a new window was created in the lateral semicircular canal. It is no longer preferred as it requires a mastoidectomy and does not restore the natural ossicular chain mechanism. * **C. Sacculotomy:** This is a surgical procedure (Fick’s operation) used in the management of **Meniere’s disease** to decompress the endolymphatic sac; it has no role in otosclerosis. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartze Sign:** A flamingo-pink flush on the promontory seen during otoscopy (indicates active otosclerosis). * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**. * **Gelle’s Test:** Negative (indicates fixed ossicles). * **Treatment of Choice (Medical):** Sodium Fluoride (used to mature active foci). * **Most common site:** Fissula ante fenestram.

Q: What is true about cholesteatoma?

Bone erosion present. **Explanation:** Cholesteatoma is a non-neoplastic, keratinizing squamous epithelium-lined sac found within the middle ear or mastoid. Despite being histologically "benign," it is clinically aggressive due to its ability to cause extensive **bone erosion**. **Why Option B is Correct:** The hallmark of cholesteatoma is bone destruction. This occurs via two primary mechanisms: 1. **Pressure Necrosis:** The expanding sac exerts physical pressure on the surrounding bony walls. 2. **Enzymatic Activity:** The presence of osteoclasts and enzymes like **Acid Phosphatase, Collagenase, and Acid Hydrolase** at the margins of the sac actively resorbs bone. This leads to complications like ossicular destruction, facial nerve palsy, and intracranial spread. **Analysis of Incorrect Options:** * **A. Benign tumor:** Cholesteatoma is a **pseudotumor** or a "skin in the wrong place." It lacks the cellular features of a true neoplasm (tumor). * **C. Most common cause of conductive deafness:** While it causes hearing loss, the most common cause of conductive deafness overall is **Otitis Media with Effusion (OME)** or **Impacted Wax**. * **D. Found in the apex of the petrous bone commonly:** Cholesteatoma most commonly originates in the **Attic (Prussak’s space)** or the posterosuperior quadrant of the middle ear. Petrous apex involvement is rare and usually associated with congenital types or advanced secondary spread. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest bone to be eroded:** The **Incus** (specifically the long process) is the most common ossicle destroyed. * **Characteristic Sign:** "Attic perforation" or a retraction pocket. * **Theories of Origin:** Wittmaack’s (Negative pressure), Habermann’s (Migration), and Bezold’s (Metaplasia). * **Treatment:** Always surgical (**Mastoidectomy**) to ensure a safe, dry ear. Medical management has no role in curing cholesteatoma.

Q: Which type of abscess involves the mastoid tip?

Bezold abscess. **Explanation:** The correct answer is **Bezold abscess**. This condition occurs when pus from a mastoid air cell infection (coalescent mastoiditis) breaks through the thin inner table of the **mastoid tip**. The pus tracks down into the sheath of the **sternocleidomastoid muscle**, presenting as a painful inflammatory swelling in the upper neck. **Analysis of Options:** * **Bezold Abscess (Correct):** Specifically involves the mastoid tip. The pus is deep to the sternocleidomastoid muscle, often making the swelling feel firm rather than fluctuant. * **Luc Abscess:** This is a subperiosteal abscess where pus tracks through the **meatal wall** (external auditory canal) rather than the mastoid tip. It is often associated with chronic suppurative otitis media (CSOM). * **Citelli Abscess:** Pus tracks through the **digastric notch** (medial to the mastoid tip) and follows the posterior belly of the digastric muscle toward the occipital bone or digastric triangle. * **Parapharyngeal Abscess:** This is a deep neck space infection. While it can be a complication of ear infections (Bezold abscess tracking medially), it most commonly arises from tonsillar or dental infections. **High-Yield Clinical Pearls for NEET-PG:** * **Citelli’s Abscess:** Think "Digastric muscle/Occipital region." * **Zygomatic Abscess:** Pus tracks into the root of the zygoma, causing swelling over the cheek and lower eyelid. * **Post-auricular Abscess:** The most common complication of acute mastoiditis; it displaces the pinna **forwards and downwards**. * **Radiology:** Contrast-enhanced CT (CECT) is the gold standard for diagnosing these extracranial complications of mastoiditis.

Q: What type of tympanoplasty is myringostapediopexy?

Type 3. **Explanation:** The classification of tympanoplasty was originally proposed by **Wullstein** to describe various methods of reconstructing the middle ear sound-conduction mechanism. **Why Type 3 is Correct:** In **Type 3 Tympanoplasty (Myringostapediopexy)**, the malleus and incus are absent or diseased, but the **stapes is intact and mobile**. The graft (neotympanum) is placed directly onto the head of the stapes. This creates a shallow middle ear cleft, and sound is transmitted directly from the tympanic membrane to the stapes head. **Analysis of Incorrect Options:** * **Type 1:** Also known as **Myringoplasty**. It involves repair of the tympanic membrane alone when the ossicular chain is completely intact and mobile. * **Type 2:** Used when the malleus is partially eroded. The graft is placed onto the **incus** or the remains of the malleus. * **Type 4:** Used when the stapes suprastructure is absent, but the **footplate is mobile**. The graft is placed directly onto the mobile footplate. The round window is shielded to create a phase differential (baffle effect). **High-Yield Clinical Pearls for NEET-PG:** * **Type 5:** Involves fenestration of the horizontal semicircular canal (used when the stapes footplate is fixed). * **Wullstein Classification** is based on the status of the ossicles and where the graft is placed. * **Type 3** is the most common type performed during Modified Radical Mastoidectomy (MRM) when the incus is necrosed (the most common ossicle to undergo necrosis). * **Columella Effect:** Type 3 tympanoplasty mimics the avian hearing mechanism where a single bone (columella) connects the drum to the oval window.

Q: Endolymph in the inner ear:

Is secreted by the stria vascularis. **Explanation:** The inner ear contains two distinct fluids: **perilymph** and **endolymph**. Understanding their origin and composition is a high-yield topic for NEET-PG. **1. Why the Correct Answer is Right:** The **stria vascularis**, a highly vascularized layer of stratified epithelium located on the outer wall of the cochlear duct (scala media), is the primary site for the production of endolymph. It functions as a "metabolic engine," actively transporting ions to maintain the unique chemical composition of endolymph, which is characterized by a **high Potassium (K+)** and **low Sodium (Na+)** concentration. This creates the endocochlear potential (+80 mV) necessary for hair cell transduction. **2. Why the Other Options are Wrong:** * **Option A:** Perilymph, not endolymph, is considered a filtrate of blood serum (and is also continuous with cerebrospinal fluid via the cochlear aqueduct). * **Option C:** The **basilar membrane** is a structural partition that supports the Organ of Corti; it has no secretory function. * **Option D:** **Hair cells** are sensory receptors that are bathed in endolymph; they do not secrete it. They rely on the ionic gradient provided by the stria vascularis to function. **Clinical Pearls for NEET-PG:** * **Composition:** Endolymph resembles **intracellular fluid** (High K+), while perilymph resembles **extracellular fluid** (High Na+). * **Meniere’s Disease:** Caused by the distension of the endolymphatic space due to defective resorption (Endolymphatic Hydrops). * **Absorption:** Endolymph is drained via the endolymphatic duct and absorbed by the **endolymphatic sac**. * **Potassium Recycling:** Mutations in GJB2 (Connexin 26) affect potassium recycling between the hair cells and stria vascularis, leading to common forms of hereditary deafness.

Q: Otospongiosis causes which of the following?

Bilateral mixed conductive and sensorineural deafness. **Explanation:** **Otospongiosis (Otosclerosis)** is a primary metabolic bone disease of the otic capsule characterized by the replacement of normal dense bone with vascular spongy bone. **Why Option D is Correct:** 1. **Bilateral Involvement:** In approximately 70–85% of cases, otosclerosis is a **bilateral** and symmetrical condition. 2. **Mixed Deafness:** * **Conductive component:** Most commonly, the disease affects the *fissula ante fenestram*, leading to stapes fixation (stapedial otosclerosis), which prevents sound conduction. * **Sensorineural component:** In **Cochlear Otosclerosis**, enzymes released into the inner ear fluids or vascular shunts between the focus and the cochlea cause hair cell damage, leading to SNHL. * When both stapedial fixation and cochlear involvement occur, it results in **mixed hearing loss**. **Why Other Options are Incorrect:** * **Options A & C:** While otosclerosis can rarely be unilateral (15%), it is classically a bilateral disease. NEET-PG questions prioritize the most common clinical presentation. * **Option B:** While conductive hearing loss is the hallmark, "only" makes this incorrect. Advanced stages or cochlear variants frequently involve a sensorineural component, making "mixed" a more comprehensive answer. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartze Sign (Flamingo Flush):** Reddish hue seen through the TM due to increased vascularity of the promontory (active stage). * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**. * **Gelle’s Test:** Negative (indicates stapes fixation). * **Tympanometry:** Typically shows an **As type** curve (stiffened ossicular chain). * **Treatment of Choice:** Stapedotomy (using a Teflon piston). Medical management involves **Sodium Fluoride** to mature active foci.

Question 1

A patient presents with hyperacusis, loss of lacrimation, and loss of taste sensation in the anterior 2/3rd of the tongue. Inflammation extends up to which part of the facial nerve?

Accepted Answer

Proximal to the geniculate ganglion

Answer

Vertical part

Answer

Vertical part proximal to the nerve to stapedius

Answer

Vertical part and beyond the nerve to stapedius

Question 2

An 8-year-old boy presented with a severe infection of the right middle ear. Within a week, the infection spread to the mastoid antrum and mastoid air cells. Despite antibiotic treatment, the organisms did not respond, leading the surgeon to perform a radical mastoid operation. Postoperatively, the boy's face became distorted: his mouth was drawn upward to the left, and he was unable to close his right eye. Saliva accumulated in his right cheek and dribbled from the corner of his mouth. What structure was most likely damaged during the operation?

Accepted Answer

Facial nerve

Answer

Mandibular nerve

Answer

Parotid duct

Answer

Vagus nerve

Question 3

Which surgical procedure is most preferred in the management of otosclerosis?

Accepted Answer

Stapedotomy

Answer

Stapedectomy

Answer

Fenestration

Answer

Sacculotomy

Question 4

What is true about cholesteatoma?

Accepted Answer

Bone erosion present

Answer

Benign tumor

Answer

Most common cause of conductive deafness

Answer

Found in the apex of the petrous bone commonly

Question 5

Which of the following is NOT an absolute contraindication of tympanoplasty?

Accepted Answer

Poor eustachian tube function

Answer

Malignant otitis externa

Answer

Tumor of the middle ear

Answer

Active ear discharge

Question 6

Bleeding ear discharge is mostly due to which of the following?

Accepted Answer

Glomus tumor

Answer

Otosclerosis

Answer

Otitis media with effusion

Answer

Acoustic neuroma

Question 7

Which type of abscess involves the mastoid tip?

Accepted Answer

Bezold abscess

Answer

Luc abscess

Answer

Citelli abscess

Answer

Parapharyngeal abscess

Question 8

What type of tympanoplasty is myringostapediopexy?

Accepted Answer

Type 3

Answer

Type 1

Answer

Type 2

Answer

Type 4

Question 9

Endolymph in the inner ear:

Accepted Answer

Is secreted by the stria vascularis

Answer

Is a filtrate of blood serum

Answer

Is secreted by the basilar membrane

Answer

Is secreted by hair cells

Question 10

Otospongiosis causes which of the following?

Accepted Answer

Bilateral mixed conductive and sensorineural deafness

Answer

Unilateral conductive deafness only

Answer

Bilateral conductive deafness only

Answer

Unilateral sensorineural deafness only

Otology — MCQs

Otology — MCQs

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