Otology — MCQs

Otology Indian Medical PG Practice Questions and MCQs

Question 221: A 30-year-old woman presents with progressive conductive deafness bilaterally. What is the most common cause?

A. Tympanosclerosis
B. Otosclerosis (Correct Answer)
C. Meniere's disease
D. Bilateral otitis media

Explanation: **Explanation:** **Otosclerosis** is the most common cause of progressive conductive hearing loss (CHL) in young adults with a normal tympanic membrane. It is a primary metabolic bone disease of the otic capsule characterized by the replacement of normal bone with vascular spongy bone, most commonly at the **fissula ante fenestram**. This leads to stapedial fixation. It typically presents in the 2nd to 4th decades of life, shows a female preponderance (2:1), and is bilateral in 70-80% of cases. **Analysis of Options:** * **Tympanosclerosis (A):** While it causes CHL, it is usually a sequel to chronic otitis media and presents with characteristic "chalky white" patches on the tympanic membrane. * **Meniere’s Disease (C):** This is an inner ear disorder (endolymphatic hydrops) characterized by a triad of vertigo, tinnitus, and **sensorineural** hearing loss (SNHL), not conductive. * **Bilateral Otitis Media (D):** While common, it usually presents with acute symptoms (pain/fever) or chronic discharge. It is less likely than Otosclerosis to present as isolated, slowly progressive deafness in a 30-year-old with an intact drum. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartz Sign:** A "flamingo pink" flush on the tympanic membrane due to increased vascularity (active phase). * **Carhart’s Notch:** A characteristic dip in the bone conduction curve at **2000 Hz**. * **Gelle’s Test:** Negative (indicates fixed ossicles). * **Treatment of Choice:** Stapedotomy (using a Teflon piston). * **Hormonal Influence:** Hearing loss often rapidly progresses during pregnancy.

Question 222: All are features of otosclerosis EXCEPT?

A. Schwartze sign
B. Dip in audiogram
C. Endolymphatic hydrops (Correct Answer)
D. Willis' paracusis

Explanation: **Explanation:** Otosclerosis is a primary metabolic bone disease of the otic capsule characterized by the replacement of normal bone with vascular spongy bone, eventually leading to stapedial fixation and conductive hearing loss. **Why Endolymphatic Hydrops is the correct answer:** Endolymphatic hydrops is the pathological hallmark of **Meniere’s disease**, not otosclerosis. It involves the distension of the endolymphatic system due to an imbalance in the production and resorption of endolymph. While advanced cochlear otosclerosis can rarely cause secondary hydrops, it is not a classic feature of the disease. **Analysis of other options:** * **Schwartze sign (Flamingo flush):** A clinical sign seen during active otosclerosis (otospongiosis). It is a reddish hue seen through the tympanic membrane due to increased vascularity over the promontory. * **Dip in audiogram (Carhart’s Notch):** A characteristic finding in otosclerosis where there is a mechanical dip in the bone conduction threshold, most prominent at **2000 Hz**. * **Willis' paracusis:** A phenomenon where a patient with conductive hearing loss (like otosclerosis) hears better in noisy environments because people speak louder, and the background noise is filtered out by the patient's conductive barrier. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant with incomplete penetrance. * **Demographics:** Most common in young females; often worsens during pregnancy. * **Gelle’s Test:** Negative (indicates fixed ossicular chain). * **Tympanometry:** Typically shows an **As type** curve (stiffened system). * **Surgery of choice:** Stapedotomy (most common) or Stapedectomy. * **Medical management:** Sodium fluoride (to mature active otospongiotic foci).

Question 223: A child underwent adenoidectomy and subsequently developed middle ear effusion. What is the ideal surgical management step?

A. Grommet insertion (Correct Answer)
B. Mastoidectomy
C. Tympanoplasty
D. None of the above

Explanation: **Explanation:** The middle ear is ventilated via the **Eustachian tube (ET)**. In children, adenoid hypertrophy is a common cause of ET dysfunction, leading to negative middle ear pressure and **Otitis Media with Effusion (OME)**. When a child develops persistent middle ear effusion despite an adenoidectomy, it indicates that the ET function has not fully recovered or that the effusion is thick ("glue ear") and unlikely to resolve spontaneously. **Why Option A is correct:** **Grommet insertion (Myringotomy with ventilation tube)** is the gold standard for persistent OME. The grommet bypasses the dysfunctional Eustachian tube, providing continuous ventilation to the middle ear, equalizing pressure, and allowing the drainage of fluid. This restores hearing and prevents complications like ossicular necrosis or cholesteatoma. **Why other options are incorrect:** * **B. Mastoidectomy:** This is indicated for chronic suppurative otitis media (CSOM) with cholesteatoma or mastoiditis. It is too invasive for simple middle ear effusion. * **C. Tympanoplasty:** This is a reconstructive surgery to repair a perforated tympanic membrane or ossicular chain. In OME, the drum is intact but retracted; creating a permanent graft is not indicated. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for Grommet:** Antero-inferior quadrant of the tympanic membrane (to avoid injury to the incudostapedial joint). * **Indications for Adenoidectomy in OME:** Recurrent OME, nasal obstruction, or if the effusion persists after a previous myringotomy. * **Hearing Loss type:** OME typically causes a **Conductive Hearing Loss** of 25–40 dB. * **Bilateral OME in an adult:** Always rule out **Nasopharyngeal Carcinoma** (NPC) obstructing the ET opening.

Question 224: In Ramsay Hunt syndrome, which cranial nerve is involved?

A. Trigeminal
B. Facial (Correct Answer)
C. Glossopharyngeal
D. Occulomotor

Explanation: **Explanation:** **Ramsay Hunt Syndrome (Herpes Zoster Oticus)** is caused by the reactivation of the **Varicella-Zoster Virus (VZV)** dormant in the **Geniculate Ganglion** of the **Facial Nerve (CN VII)**. 1. **Why Facial Nerve is Correct:** The virus travels along the sensory fibers of the facial nerve, leading to the classic clinical triad: **ipsilateral facial nerve palsy** (Lower Motor Neuron type), **otalgia** (ear pain), and **vesicular eruptions** in the external auditory canal, concha, or pinna. It may also involve the vestibulocochlear nerve (CN VIII), causing vertigo or hearing loss. 2. **Why Incorrect Options are Wrong:** * **Trigeminal (CN V):** While VZV can affect the Gasserian ganglion (causing Herpes Zoster Ophthalmicus), it is not the primary nerve involved in Ramsay Hunt Syndrome. * **Glossopharyngeal (CN IX):** This nerve provides sensation to the posterior third of the tongue and oropharynx; its involvement is rare and does not define this syndrome. * **Oculomotor (CN III):** This is a motor nerve for eye movements; it is not associated with the cutaneous vesicular patterns of VZV reactivation in the ear. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Primarily clinical; Tzanck smear shows multinucleated giant cells. * **Prognosis:** The facial palsy in Ramsay Hunt is generally **more severe** and has a **poorer recovery rate** compared to Bell’s Palsy. * **Treatment:** Combination of oral **Acyclovir/Valacyclovir** and **Corticosteroids**. * **Hitches’ Rule:** Vesicles may also appear on the anterior 2/3rd of the tongue or soft palate (via the chorda tympani and greater petrosal branches).

Question 225: Which of the following statements is true about the Eustachian tube?

A. Statements a, c, and d are true.
B. Statements b, d, and e are true.
C. Statements a, c, and e are true. (Correct Answer)
D. Statements a, d, and e are true.

Explanation: The Eustachian tube (ET) is a dynamic osteocartilaginous canal connecting the middle ear to the nasopharynx, essential for pressure equalization and protection. ### **Analysis of Statements** * **(a) Length is approximately 36 mm:** This is **True**. In adults, the ET measures about 36 mm, divided into a lateral bony part (1/3rd, 12 mm) and a medial cartilaginous part (2/3rd, 24 mm). * **(b) It is shorter and more vertical in adults:** This is **False**. In infants, the tube is shorter (18 mm), wider, and more **horizontal** (10° angle). In adults, it is longer and more **vertical** (45° angle), which provides better protection against reflux. * **(c) Tensor veli palatini is the main dilator:** This is **True**. Often called the "dilator tubae," this muscle (supplied by the Mandibular nerve, V3) is the primary muscle responsible for opening the tube during swallowing or yawning. * **(d) It opens into the oropharynx:** This is **False**. The ET opens into the lateral wall of the **nasopharynx**, just posterior to the inferior turbinate. * **(e) It is lined by ciliated columnar epithelium:** This is **True**. The lining is continuous with the respiratory mucosa of the nasopharynx, facilitating the mucociliary clearance of middle ear secretions. ### **Why Option C is Correct** Option C correctly identifies that statements **a, c, and e** are anatomically and physiologically accurate. Statements **b** and **d** contain factual errors regarding the orientation and anatomical termination of the tube. ### **High-Yield Clinical Pearls for NEET-PG** * **Isthmus:** The narrowest part of the ET, located at the junction of the bony and cartilaginous portions. * **Ostmann’s Fat Pad:** Located laterally to the cartilaginous tube; its loss (e.g., rapid weight loss) leads to a **Patulous Eustachian Tube**. * **Toynbee Maneuver:** Swallowing with nostrils pinched shut (tests ET patency). * **Pediatric Predisposition:** The horizontal and short nature of the ET in children is the primary reason for the higher incidence of **Otitis Media** in this age group.

Question 226: Which anatomical structure appears as a promontory in the middle ear?

A. Jugular bulge
B. Basal turn of cochlea (Correct Answer)
C. Semicircular canal
D. Head of incus

Explanation: ### Explanation The **promontory** is a distinct rounded bulge found on the **medial (labyrinthine) wall** of the middle ear. It is formed by the outward projection of the **basal turn of the cochlea**. #### Why the Correct Answer is Right: * **Anatomy:** The cochlea is a snail-shaped structure. Its first and widest turn (the basal turn) lies directly medial to the tympanic cavity. Because the cochlea is larger than the space available, it pushes the medial wall laterally, creating the "promontory." * **Innervation:** Overlying the promontory is the **tympanic plexus**, primarily formed by the tympanic branch of the Glossopharyngeal nerve (Jacobson’s nerve). #### Why Other Options are Wrong: * **A. Jugular bulge:** This is located on the **floor (inferior wall)** of the middle ear. A "high dehiscent jugular bulb" can mimic a vascular mass behind the eardrum but does not form the promontory. * **C. Semicircular canal:** The lateral semicircular canal produces a prominence on the **medial wall**, but it is located superior and posterior to the promontory and the facial nerve canal. * **D. Head of incus:** This is an ossicle located in the **epitympanum (attic)**, forming part of the lateral wall/roof area, not the medial wall. #### NEET-PG High-Yield Pearls: * **Jacobson’s Nerve:** It provides sensory supply to the middle ear mucosa and carries preganglionic parasympathetic fibers to the parotid gland. * **Clinical Sign:** In **Otosclerosis**, a reddish hue seen over the promontory due to increased vascularity is known as **Schwartze sign** (Flamingo pink flush). * **Glomus Tympanicum:** This tumor typically arises from the glomus bodies located on the promontory along the course of Jacobson’s nerve.

Question 227: What is the commonest site of otosclerosis?

A. Round window
B. Utricle
C. Ossicles
D. Oval window (Correct Answer)

Explanation: **Explanation:** Otosclerosis is a primary metabolic bone disease of the otic capsule characterized by abnormal bone remodeling, where mature lamellar bone is replaced by vascular spongy bone. **1. Why the Oval Window is Correct:** The **oval window** is the most frequent site of involvement. Specifically, the lesion typically begins at the **fissula ante fenestram**, a small area of embryonic cartilage located just anterior to the oval window. As the disease progresses, it involves the annular ligament and the footplate of the stapes, leading to **stapedial fixation** and subsequent conductive hearing loss. **2. Analysis of Incorrect Options:** * **Round Window (Option A):** While the round window is the second most common site (involved in approximately 30-50% of cases), it is not the *most* common. Involvement here can lead to "obliterative otosclerosis." * **Utricle (Option B):** The utricle is a membranous labyrinth structure involved in balance. Otosclerosis primarily affects the bony otic capsule, not the membranous structures directly. * **Ossicles (Option C):** While the stapes footplate is involved, the term "ossicles" is too broad. The primary pathology starts in the bony labyrinth (otic capsule) rather than the ossicular chain itself (malleus or incus). **Clinical Pearls for NEET-PG:** * **Schwartze Sign:** A reddish hue seen through the TM (due to increased vascularity of the promontory), indicating active disease (otospongiosis). * **Carhart’s Notch:** A characteristic dip in the bone conduction audiogram at **2000 Hz**. * **Gelle’s Test:** Negative (indicates fixed ossicles). * **Treatment of Choice:** Stapedotomy (most common) or Stapedectomy.

Question 228: In radical mastoidectomy, which of the following procedures is not performed?

A. Lowering of the facial ridge
B. Removal of mucosa and middle ear muscles
C. Removal of all ossicles except the stapes footplate
D. Maintenance of eustachian tube patency (Correct Answer)

Explanation: **Explanation:** The primary objective of a **Radical Mastoidectomy** is to convert the mastoid antrum, tympanum, and external auditory canal into a single, common, exteriorized cavity that is "safe" and dry. This procedure is typically reserved for extensive cholesteatoma or malignancy where hearing preservation is not the priority. **Why Option D is correct:** In a radical mastoidectomy, the goal is to eliminate the middle ear as a functioning air-filled space. Therefore, the **Eustachian tube is intentionally obliterated** (using muscle, cartilage, or bone chips) to prevent nasopharyngeal secretions from entering the mastoid cavity, which would otherwise cause chronic discharge. Maintaining patency is a goal of *tympanoplasty* or *modified* radical mastoidectomy, not radical mastoidectomy. **Analysis of incorrect options:** * **A. Lowering of the facial ridge:** This is a hallmark of the procedure. The posterior meatal wall is removed down to the level of the vertical segment of the facial nerve to ensure the cavity is saucerized and easily inspectable. * **B. Removal of mucosa and middle ear muscles:** To ensure a dry cavity, all secreting mucosa and the tensor tympani/stapedius muscles are removed to prevent granulation tissue formation. * **C. Removal of all ossicles except stapes footplate:** All remnants of the malleus, incus, and the stapes suprastructure are removed. Only the stapes footplate is left to protect the oval window and prevent a labyrinthine fistula. **High-Yield Clinical Pearls for NEET-PG:** * **Bondy’s Procedure:** A modified radical mastoidectomy used specifically for attic cholesteatoma where the pars tensa and ossicular chain are intact. * **The "Bridge":** The portion of the horizontal limbus of the notch of Rivinus that is removed during radical mastoidectomy. * **Goal:** Radical mastoidectomy aims for a **"Safe Ear"** (removing disease) rather than a "Hearing Ear."

Question 229: Which of the following statements are true about otosclerosis?

A. Fifty percent of patients have a family history. Deafness occurs between 20-30 years of age but is less common before 10 years and after 40 years. Pregnancy has a bearing on the condition. (Correct Answer)
B. Males are affected twice as often as females. Deafness occurs between 20-30 years of age but is less common before 10 years and after 40 years. Pregnancy has a bearing on the condition.
C. Fifty percent of patients have a family history. Males are affected twice as often as females. Deafness occurs between 20-30 years of age but is less common before 10 years and after 40 years.
D. Fifty percent of patients have a family history. Deafness occurs between 20-30 years of age but is less common before 10 years and after 40 years.

Explanation: **Explanation:** Otosclerosis is a primary metabolic bone disease of the otic capsule characterized by abnormal bone resorption and deposition. The correct option (A) accurately reflects the classic epidemiological profile of the disease. 1. **Why Option A is Correct:** * **Genetics:** Approximately **50% of cases** show a positive family history, typically following an autosomal dominant pattern with incomplete penetrance. * **Age of Onset:** Clinical deafness usually manifests between **20–30 years**. It is rare in children (juvenile otosclerosis) and uncommon to start after age 40. * **Hormonal Influence:** Pregnancy is a well-known trigger that can **accelerate or aggravate** the progression of hearing loss due to hormonal changes affecting bone remodeling. 2. **Why Other Options are Incorrect:** * **Gender Predominance (Options B & C):** These are incorrect because otosclerosis is **twice as common in females** than in males (Ratio 2:1). Options B and C incorrectly state that males are affected more often. * **Incompleteness (Option D):** While the facts in Option D are true, it omits the high-yield fact regarding the influence of pregnancy, making Option A the most comprehensive and correct choice. **High-Yield NEET-PG Pearls:** * **Schwartze Sign (Flamingo Flush):** A reddish hue seen through the TM due to increased vascularity of the promontory (active phase). * **Gelle’s Test:** Negative (indicates stapes fixation). * **Bezold’s Triad:** 1. Negative Rinne, 2. Raised bone conduction threshold (false), 3. Low-frequency hearing loss. * **Carhart’s Notch:** A characteristic dip in the bone conduction curve at **2000 Hz**. * **Treatment of Choice:** Stapedotomy (using a Teflon piston). * **Medical Management:** Sodium Fluoride (inhibits osteoclastic activity).

Question 230: 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?

A. Vertical part
B. Vertical part proximal to the nerve to stapedius
C. Vertical part and beyond the nerve to stapedius
D. Proximal to the geniculate ganglion (Correct Answer)

Explanation: ### Explanation To solve this question, one must understand the **topographic anatomy** of the facial nerve and the sequence in which its branches exit. The symptoms provided indicate the level of the lesion based on the functions lost: 1. **Loss of Lacrimation:** This indicates involvement of the **Greater Superficial Petrosal Nerve (GSPN)**, which arises from the **Geniculate Ganglion**. 2. **Hyperacusis:** This indicates involvement of the **Nerve to Stapedius**, which arises from the **Vertical (Mastoid) segment**. 3. **Loss of Taste (Anterior 2/3rd of tongue):** This indicates involvement of the **Chorda Tympani**, which also arises from the **Vertical segment**. **Why Option D is Correct:** For a patient to lose lacrimation, the lesion must be at or **proximal to the geniculate ganglion**. If the lesion were distal to this ganglion, the GSPN would be spared, and lacrimation would remain intact. Since all three functions (lacrimation, stapedial reflex, and taste) are affected, the inflammation must be at the most proximal point among these branches. **Why Other Options are Incorrect:** * **Options A, B, and C:** These refer to the **Vertical part** of the nerve. The vertical segment begins *after* the horizontal segment and the geniculate ganglion. A lesion in the vertical part would cause loss of taste and hyperacusis but would **spare lacrimation**, as the GSPN has already branched off proximally. ### Clinical Pearls for NEET-PG: * **Schirmer’s Test:** Used to evaluate the GSPN (lacrimation). * **Stapedial Reflex:** Evaluates the Nerve to Stapedius; its absence causes hyperacusis (normal sounds appearing painfully loud). * **Electrogustatometry:** Evaluates the Chorda Tympani (taste). * **Bell’s Palsy:** The most common cause of lower motor neuron facial palsy; localization is key to determining prognosis and surgical decompression sites. * **Order of branching (Proximal to Distal):** GSPN (at Geniculate Ganglion) → Nerve to Stapedius (Vertical part) → Chorda Tympani (Vertical part).

Practice by Chapter

Tympanic Membrane Perforation

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Cholesteatoma

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Tympanoplasty Techniques

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Ossicular Chain Reconstruction

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Mastoidectomy

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Stapedectomy

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Implantable Hearing Devices

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Congenital Aural Atresia

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Otologic Trauma

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Glomus Tumors

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Facial Nerve Decompression

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Rehabilitative Audiology

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Otology — MCQs

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