Otology — MCQs
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What is the scutum?
Cauliflower ear is due to what condition?
Endolymphatic decompression is indicated for which condition?
An elderly diabetic patient consults a physician due to severe earache. Examination reveals foul-smelling purulent otorrhea and a red mass lesion in the external ear canal. Biopsy of the mass demonstrates granulation tissue. What is the most likely causative organism?
Pulsatile tinnitus in the ear is most commonly due to which of the following conditions?
A 3-year-old girl ruptured her eardrum when she inserted a pencil into her ear. Her mother took her to the emergency department after noticing that the child was crying and complaining of pain in her ear with a few drops of blood in the external auditory meatus. The attending doctor examined the child for possible injury to a nerve that runs across the eardrum. Which is the MOST likely nerve to be injured?
Galle's test is used for which of the following conditions?
What is the most mobile part of the tympanic membrane?
A 60-year-old lady presented with mild hearing loss and pulsatile tinnitus of the right ear. Otoscopy revealed specific findings. What is the most probable diagnosis?
A one-year-old child presents with bilateral hearing difficulty. Impedance audiometry shows a Type B curve and there is a bilateral conductive hearing deficit. There are no signs of infection. What is the next step?
Otology Indian Medical PG Practice Questions and MCQs
Question 101: What is the scutum?
- A. Bony part of the outer attic wall (Correct Answer)
- B. Bony part of the inner attic wall
- C. Cartilaginous part of the outer attic wall
- D. Cartilaginous part of the inner attic wall
Explanation: **Explanation:** The **scutum** (also known as Leidy’s column) is a sharp, wedge-shaped bony spur located at the junction of the superior wall of the external auditory canal and the lateral wall of the attic (epitympanum). **1. Why Option A is Correct:** The scutum forms the **bony part of the outer attic wall**. It serves as the superior attachment point for the Pars Flaccida (Shrapnell’s membrane) of the tympanic membrane. In the early stages of an attic cholesteatoma, the pressure and enzymatic activity of the expanding sac cause erosion of this bony landmark. **2. Why the Other Options are Incorrect:** * **Options B & D (Inner Attic Wall):** The inner (medial) wall of the attic is formed by the bony prominence of the lateral semicircular canal and the prominence of the facial nerve canal, not the scutum. * **Options C & D (Cartilaginous):** The scutum is strictly a **bony** structure belonging to the squamous part of the temporal bone. The medial portion of the external auditory canal is entirely bony, while only the lateral one-third is cartilaginous. **Clinical Pearls for NEET-PG:** * **Radiological Significance:** On a CT scan of the temporal bone (Coronal view), the **blunting or erosion of the scutum** is the earliest radiological sign of an attic cholesteatoma. * **Anatomical Boundary:** It forms the lateral boundary of **Prussak’s space**, which is the most common site for the primary origin of a cholesteatoma. * **Surgical Landmark:** During a canal wall down mastoidectomy, the scutum is removed to gain access to the attic.
Question 102: Cauliflower ear is due to what condition?
- A. Hematoma (Correct Answer)
- B. Carcinoma
- C. Fungal infection
- D. Herpes
Explanation: **Explanation:** **Cauliflower ear** (also known as Boxer’s ear or Wrestler’s ear) is a permanent deformity of the auricle caused by an untreated or inadequately treated **Auricular Hematoma**. 1. **Why Hematoma is Correct:** The pinna's cartilage relies on the overlying perichondrium for its blood supply (as cartilage is avascular). Blunt trauma causes blood to accumulate in the subperichondrial space (hematoma), stripping the perichondrium away from the cartilage. This leads to **ischemic necrosis** of the cartilage. During the healing process, asymmetrical fibrocartilage forms and the area undergoes fibrosis and contracture, resulting in the characteristic shriveled, "cauliflower" appearance. 2. **Why Other Options are Incorrect:** * **Carcinoma:** Squamous cell carcinoma of the ear typically presents as a non-healing ulcer or an exophytic growth, not a diffuse cartilaginous deformity. * **Fungal Infection:** Otomycosis (fungal infection) affects the external auditory canal, causing itching and debris, but does not alter the structural anatomy of the pinna. * **Herpes:** Herpes Zoster Oticus (Ramsay Hunt Syndrome) presents with painful vesicles and facial nerve palsy, not cartilaginous fibrosis. **High-Yield Clinical Pearls for NEET-PG:** * **Management:** The treatment of choice for an acute auricular hematoma is **Incision and Drainage (I&D)** followed by a firm pressure dressing to prevent re-accumulation of blood. * **Complication:** If the hematoma becomes infected, it leads to **Perichondritis**, which can further accelerate cartilage destruction. * **Site:** Hematomas most commonly occur on the anterior/lateral surface of the pinna where the skin is tightly bound to the perichondrium.
Question 103: Endolymphatic decompression is indicated for which condition?
- A. Tinnitus
- B. Acoustic neuroma
- C. Meniere's disease (Correct Answer)
- D. Endolymphatic fistula
Explanation: ### Explanation **Meniere’s Disease (Correct Answer)** Meniere’s disease is characterized by **endolymphatic hydrops**, which is the distension of the endolymphatic system due to an imbalance between the production and absorption of endolymph. **Endolymphatic Sac Decompression (ELSD)** is a conservative surgical procedure indicated for patients with Meniere’s disease who are refractory to medical management (e.g., salt restriction, diuretics) but still have serviceable hearing. The goal is to relieve the pressure within the vestibular system, thereby reducing the frequency and severity of vertigo attacks while preserving hearing and vestibular function. **Why the other options are incorrect:** * **Tinnitus:** While tinnitus is a symptom of Meniere’s, it is not a primary indication for decompression surgery. Tinnitus management usually involves masking, counseling, or treating the underlying cause. * **Acoustic Neuroma:** This is a benign tumor of the 8th cranial nerve. Management involves observation, radiotherapy (Gamma Knife), or surgical excision (translabyrinthine, retrosigmoid, or middle cranial fossa approaches), not endolymphatic decompression. * **Endolymphatic (Perilymphatic) Fistula:** This involves a leak of perilymph into the middle ear. Management focuses on bed rest or surgical patching of the oval or round window, not decompression of the endolymphatic sac. **High-Yield Clinical Pearls for NEET-PG:** * **Meniere’s Tetrad:** Episodic vertigo, fluctuating sensorineural hearing loss (SNHL), tinnitus, and aural fullness. * **Staging:** ELSD is typically considered for **Stage 2 or 3** Meniere’s. * **Glycerol Test:** Used for diagnosis; it causes temporary improvement in hearing by osmotically reducing hydrops. * **Lermoyez Syndrome:** A variant of Meniere’s where hearing *improves* during a vertigo attack. * **Surgical Hierarchy:** ELSD (Hearing-preserving) → Intratympanic Gentamicin (Chemical labyrinthectomy) → Vestibular Nerve Section → Labyrinthectomy (Ablative; for non-serviceable hearing).
Question 104: An elderly diabetic patient consults a physician due to severe earache. Examination reveals foul-smelling purulent otorrhea and a red mass lesion in the external ear canal. Biopsy of the mass demonstrates granulation tissue. What is the most likely causative organism?
- A. Escherichia coli
- B. Haemophilus influenzae
- C. Proteus vulgaris
- D. Pseudomonas aeruginosa (Correct Answer)
Explanation: **Explanation:** The clinical presentation describes a classic case of **Malignant Otitis Externa (MOE)**, also known as Necrotizing Otitis Externa. This is a life-threatening, invasive infection of the external auditory canal that typically affects **elderly diabetic patients** or the immunocompromised. **1. Why Pseudomonas aeruginosa is correct:** * **Pathogen:** *Pseudomonas aeruginosa* is the causative organism in more than **95% of cases**. It is an opportunistic gram-negative aerobe that thrives in moist environments. * **Clinical Features:** The hallmark triad includes **excruciating ear pain** (out of proportion to clinical findings), **foul-smelling otorrhea**, and the presence of **granulation tissue** at the bony-cartilaginous junction of the ear canal. * **Pathophysiology:** The infection starts in the external canal and spreads to the skull base (osteomyelitis), potentially involving cranial nerves (CN VII is most common). **2. Why the other options are incorrect:** * **A. Escherichia coli & C. Proteus vulgaris:** While these gram-negative organisms can occasionally be found in chronic suppurative otitis media (CSOM), they are rarely the primary drivers of the invasive necrotizing process seen in MOE. * **B. Haemophilus influenzae:** This is a common cause of Acute Otitis Media (AOM) in children, typically presenting with fever and a bulging tympanic membrane, not invasive external canal infections in diabetics. **3. NEET-PG High-Yield Pearls:** * **Diagnosis:** The most sensitive initial imaging is a **Technetium-99m scan** (detects osteoblastic activity), while **Gallium-67 or Indium-111 scans** are used to monitor treatment response/resolution. * **Treatment:** Long-term intravenous or oral **Fluoroquinolones** (Ciprofloxacin) are the mainstay. * **Key Sign:** Granulation tissue at the floor of the external auditory canal is a "pathognomonic" physical finding in the context of a diabetic patient with otalgia.
Question 105: Pulsatile tinnitus in the ear is most commonly due to which of the following conditions?
- A. Malignant otitis media
- B. Osteoma
- C. Mastoiditis
- D. Glomus jugulare tumor (Correct Answer)
Explanation: **Explanation:** **Pulsatile tinnitus** is a rhythmic sound perceived in the ear that synchronizes with the patient’s heartbeat. It typically indicates a vascular abnormality or a highly vascularized tumor within or near the temporal bone. **Why Glomus Jugulare is correct:** Glomus jugulare (Paraganglioma) is the most common benign tumor of the middle ear. These tumors are **highly vascular**, arising from the glomus bodies in the adventitia of the jugular bulb. Because of their extreme vascularity and proximity to the cochlea, the turbulent blood flow within the tumor is heard by the patient as a "pulsing" sound. This is a classic hallmark of the condition, often accompanied by a "red flush" seen behind the tympanic membrane (Rising Sun appearance). **Why other options are incorrect:** * **Malignant Otitis Media:** This is a severe necrotizing infection of the external ear canal (usually caused by *Pseudomonas*) seen in diabetics. It presents with excruciating pain and granulation tissue, not typically pulsatile tinnitus. * **Osteoma:** This is a benign bony overgrowth of the external auditory canal. It may cause conductive hearing loss if it occludes the canal, but it is not a vascular lesion. * **Mastoiditis:** This is an acute inflammatory/infectious process of the mastoid air cells. While it causes pain, fever, and discharge, it does not typically present with rhythmic vascular sounds. **High-Yield Clinical Pearls for NEET-PG:** * **Brown’s Sign:** Pulsation of the tumor seen on otoscopy that ceases when the ear canal pressure is raised with a Siegle’s speculum (Pathognomonic for Glomus tumors). * **Aquino’s Sign:** Pulsations cease upon carotid artery compression. * **Phelps Sign:** Loss of the bony plate between the jugular bulb and the middle ear (seen on CT). * **Differential Diagnosis:** Other causes of pulsatile tinnitus include Carotid-cavernous fistula, Aberrant carotid artery, and Benign Intracranial Hypertension.
Question 106: A 3-year-old girl ruptured her eardrum when she inserted a pencil into her ear. Her mother took her to the emergency department after noticing that the child was crying and complaining of pain in her ear with a few drops of blood in the external auditory meatus. The attending doctor examined the child for possible injury to a nerve that runs across the eardrum. Which is the MOST likely nerve to be injured?
- A. Auricular branch of the vagus
- B. Chorda tympani (Correct Answer)
- C. Glossopharyngeal nerve (CN IX)
- D. Lesser petrosal nerve
Explanation: **Explanation:** **1. Why Chorda Tympani is Correct:** The **chorda tympani** is a branch of the facial nerve (CN VII) that carries taste sensation from the anterior two-thirds of the tongue and parasympathetic fibers to the submandibular and sublingual glands. Anatomically, it enters the middle ear through the posterior canaliculus and runs across the medial surface of the **upper part of the tympanic membrane (pars tensa)**, passing between the handle of the malleus and the long process of the incus. Due to its superficial position directly medial to the eardrum, it is the nerve most vulnerable to injury during traumatic tympanic membrane perforations (like pencil injuries) or middle ear surgeries (like stapedectomy). **2. Why Other Options are Incorrect:** * **Auricular branch of the vagus (Arnold’s nerve):** This nerve supplies the skin of the external auditory canal and the lateral surface of the tympanic membrane. While it mediates the "ear-cough reflex," it does not run *across* the drum; it is sensory to the outer surface. * **Glossopharyngeal nerve (CN IX):** It contributes to the **tympanic plexus** located on the promontory (medial wall of the middle ear), which is deeper and less likely to be injured by a superficial penetration compared to the chorda tympani. * **Lesser petrosal nerve:** This is a continuation of the tympanic plexus carrying preganglionic parasympathetic fibers to the otic ganglion. It exits the middle ear through the tegmen tympani and is not in direct contact with the tympanic membrane. **Clinical Pearls for NEET-PG:** * **Clinical sign of injury:** Damage to the chorda tympani results in a **metallic taste** or loss of taste on the ipsilateral anterior 2/3rd of the tongue. * **Anatomical Landmark:** It passes through the **Iter chordae anterius** (canal of Huguier) to exit the middle ear. * **Trauma:** In cases of longitudinal temporal bone fractures, the chorda tympani is frequently involved.
Question 107: Galle's test is used for which of the following conditions?
- A. Otosclerosis (Correct Answer)
- B. Juvenile angiofibroma
- C. Nasal polyp
- D. None of the above
Explanation: **Explanation:** **Gelle’s Test** is a clinical tuning fork test used to assess the **mobility of the ossicular chain**, specifically the stapes footplate. It is performed by placing a vibrating tuning fork on the mastoid while simultaneously increasing the air pressure in the external auditory canal using a Siegle’s speculum or a Politzer bag. 1. **Why Otosclerosis is Correct:** In a normal ear (or in cases of sensorineural hearing loss), increased air pressure pushes the tympanic membrane and ossicles inward, fixing the stapes footplate against the oval window. This reduces the perception of sound (Gelle’s positive). However, in **Otosclerosis**, the stapes is already fixed by bony overgrowth. Therefore, increasing the air pressure causes no further change in sound perception. This result is known as **Gelle’s Negative**, which is a classic finding in stapedial fixation. 2. **Why Other Options are Incorrect:** * **Juvenile Angiofibroma:** This is a benign but locally aggressive vascular tumor of the nasopharynx. Diagnosis is clinical and radiological (CT/MRI/Angiography), not via tuning fork tests. * **Nasal Polyp:** These are non-neoplastic masses of the nasal mucosa. They affect the airway and olfaction and have no direct clinical relevance to Gelle’s test. **High-Yield Clinical Pearls for NEET-PG:** * **Gelle’s Negative:** Seen in Otosclerosis and Ossicular Discontinuity. * **Schwartze Sign:** A flamingo-pink flush on the promontory seen in active Otosclerosis. * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz** on an audiogram, pathognomonic for Otosclerosis. * **Treatment of Choice:** Stapedotomy is the surgical procedure of choice for Otosclerosis.
Question 108: What is the most mobile part of the tympanic membrane?
- A. Central
- B. Peripheral (Correct Answer)
- C. Both
- D. None of the above
Explanation: **Explanation:** The tympanic membrane (TM) is a semi-transparent, cone-shaped structure that vibrates in response to sound waves. To understand its mobility, one must look at its anatomical attachment and shape. **Why Peripheral is Correct:** The tympanic membrane is attached to the tympanic sulcus via a fibrocartilaginous ring called the **annulus tympanicus**. However, the membrane is not a flat disc; it is cone-shaped, with the apex (umbo) directed medially. Physiologically, the peripheral part of the pars tensa is the most compliant and exhibits the maximum amplitude of excursion during sound conduction. This peripheral mobility is essential for the "transformer mechanism" of the middle ear, allowing the membrane to act like a flexible diaphragm. **Analysis of Incorrect Options:** * **Central:** The central portion of the TM is the **Umbo**. This is the most retracted part where the tip of the handle of the malleus is firmly attached. Because it is tethered to the ossicular chain, its mobility is more restricted compared to the free-moving peripheral areas. * **Both:** Mobility is not uniform across the membrane; there is a distinct gradient where the periphery moves more than the center. * **None of the above:** This is incorrect as the peripheral region is the established site of maximum mobility. **High-Yield Clinical Pearls for NEET-PG:** * **Pars Tensa vs. Pars Flaccida:** The Pars Tensa (lower part) is the main vibrating area and has three layers. The Pars Flaccida (Shrapnell’s membrane) lacks the organized fibrous middle layer, making it a common site for retraction pockets and cholesteatoma. * **Cone of Light:** Always radiates **antero-inferiorly** from the umbo in a healthy ear. * **Nerve Supply:** The outer surface is supplied by the Auriculotemporal nerve (CN V3) and the Auricular branch of the Vagus (Arnold’s nerve). The inner surface is supplied by the Glossopharyngeal nerve (CN IX) via the tympanic plexus.
Question 109: A 60-year-old lady presented with mild hearing loss and pulsatile tinnitus of the right ear. Otoscopy revealed specific findings. What is the most probable diagnosis?
- A. Acoustic neuroma
- B. Glomus tumor (Correct Answer)
- C. Squamous cell carcinoma
- D. Aural polyp
Explanation: ***Glomus tumor*** - **Pulsatile tinnitus** is a cardinal feature of glomus tumors, particularly glomus tympanicum, which presents with the classic **"rising sun" sign** on otoscopy. - **Brown's sign** (blanching of the reddish mass behind the tympanic membrane with positive pressure) is pathognomonic for glomus tympanicum. *Acoustic neuroma* - Typically presents with **unilateral sensorineural hearing loss** and **non-pulsatile tinnitus**, not pulsatile tinnitus. - Otoscopic examination is usually **normal** as the tumor arises from the cerebellopontine angle, not the middle ear. *Squamous cell carcinoma* - Presents with **otalgia**, **otorrhea**, and **granulation tissue** rather than pulsatile tinnitus. - Associated with **chronic otitis externa** and shows **ulcerative lesions** on otoscopy, not vascular masses. *Aural polyp* - Typically arises from **chronic otitis media** or **chronic otitis externa** with associated **purulent discharge**. - Appears as **pale, non-pulsatile masses** on otoscopy and does not cause pulsatile tinnitus.
Question 110: A one-year-old child presents with bilateral hearing difficulty. Impedance audiometry shows a Type B curve and there is a bilateral conductive hearing deficit. There are no signs of infection. What is the next step?
- A. Wait and watch (Correct Answer)
- B. Grommet insertion
- C. Myringotomy and aspiration
- D. Canal wall down procedure
Explanation: ### Explanation The clinical presentation describes **Otitis Media with Effusion (OME)**, also known as Serous Otitis Media or "Glue Ear." The presence of a **Type B (flat) tympanogram** indicates fluid in the middle ear, and the absence of fever or pain rules out acute infection. **1. Why "Wait and Watch" is correct:** In pediatric cases of OME, the standard of care is **watchful waiting for 3 months**. This is because approximately 75–90% of OME cases resolve spontaneously within this period. Since the child is only one year old and there are no signs of acute infection or structural damage, immediate surgical intervention is not indicated. **2. Why the other options are incorrect:** * **Grommet insertion (B):** This is indicated only if the effusion persists beyond 3 months (Chronic OME), if there is significant speech/language delay, or if there are structural changes to the tympanic membrane. * **Myringotomy and aspiration (C):** This provides temporary relief but has a high recurrence rate if done without a ventilation tube (grommet). It is not the first-line management for a fresh diagnosis. * **Canal wall down procedure (D):** This is a radical/modified radical mastoidectomy used for extensive Cholesteatoma or chronic suppurative otitis media (CSOM). It is entirely inappropriate for simple OME. **Clinical Pearls for NEET-PG:** * **Tympanometry Gold Standard:** Type B curve = Fluid (OME); Type C curve = Eustachian tube dysfunction (Negative pressure); Type As = Otosclerosis. * **First-line Medical Management:** There is no proven role for antibiotics, steroids, or antihistamines in OME; observation is the primary strategy. * **Hearing Loss:** OME is the most common cause of conductive hearing loss in children. * **Surgical Indications:** If OME persists >3 months AND is bilateral with hearing loss >20-30 dB, proceed to Myringotomy + Grommet insertion.
Practice by Chapter
Tympanic Membrane Perforation
Practice Questions
Cholesteatoma
Practice Questions
Tympanoplasty Techniques
Practice Questions
Ossicular Chain Reconstruction
Practice Questions
Mastoidectomy
Practice Questions
Stapedectomy
Practice Questions
Implantable Hearing Devices
Practice Questions
Congenital Aural Atresia
Practice Questions
Otologic Trauma
Practice Questions
Glomus Tumors
Practice Questions
Facial Nerve Decompression
Practice Questions
Rehabilitative Audiology
Practice Questions
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