Otology Practice Questions

Q: What is the scutum?

Bony part of the outer attic wall. **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.

Q: Cauliflower ear is due to what condition?

Hematoma. **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.

Q: 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?

Chorda tympani. **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.

Q: Galle's test is used for which of the following conditions?

Otosclerosis. **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.

Q: What is the most mobile part of the tympanic membrane?

Peripheral. **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.

Q: 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?

Glomus tumor. ***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.

Q: 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?

Wait and watch. ### 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.

Question 1

What is the scutum?

Accepted Answer

Bony part of the outer attic wall

Answer

Bony part of the inner attic wall

Answer

Cartilaginous part of the outer attic wall

Answer

Cartilaginous part of the inner attic wall

Question 2

Cauliflower ear is due to what condition?

Accepted Answer

Hematoma

Answer

Carcinoma

Answer

Fungal infection

Answer

Herpes

Question 3

Endolymphatic decompression is indicated for which condition?

Accepted Answer

Meniere's disease

Answer

Tinnitus

Answer

Acoustic neuroma

Answer

Endolymphatic fistula

Question 4

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?

Accepted Answer

Pseudomonas aeruginosa

Answer

Escherichia coli

Answer

Haemophilus influenzae

Answer

Proteus vulgaris

Question 5

Pulsatile tinnitus in the ear is most commonly due to which of the following conditions?

Accepted Answer

Glomus jugulare tumor

Answer

Malignant otitis media

Answer

Osteoma

Answer

Mastoiditis

Question 6

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?

Accepted Answer

Chorda tympani

Answer

Auricular branch of the vagus

Answer

Glossopharyngeal nerve (CN IX)

Answer

Lesser petrosal nerve

Question 7

Galle's test is used for which of the following conditions?

Accepted Answer

Otosclerosis

Answer

Juvenile angiofibroma

Answer

Nasal polyp

Answer

None of the above

Question 8

What is the most mobile part of the tympanic membrane?

Accepted Answer

Peripheral

Answer

Central

Answer

Both

Answer

None of the above

Question 9

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?

Accepted Answer

Glomus tumor

Answer

Acoustic neuroma

Answer

Squamous cell carcinoma

Answer

Aural polyp

Question 10

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?

Accepted Answer

Wait and watch

Answer

Grommet insertion

Answer

Myringotomy and aspiration

Answer

Canal wall down procedure

Otology — MCQs

Otology — MCQs

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