Diseases of the Ear Practice Questions

Q: Ceruminous glands are modified-

Apocrine glands. **Explanation:** The external auditory canal (EAC) consists of a cartilaginous outer third and a bony inner two-thirds. The skin of the **cartilaginous portion** contains specialized structures: hair follicles, sebaceous glands, and ceruminous glands. **1. Why Apocrine Glands is Correct:** Ceruminous glands are **modified apocrine sweat glands**. They are located in the subcutaneous layer of the outer cartilaginous EAC. These glands produce a milky secretion that, when mixed with the fatty secretions of sebaceous glands and desquamated epithelial cells, forms **cerumen (earwax)**. Cerumen serves a protective role by lubricating the canal and maintaining an acidic pH (approx. 6.1) to inhibit bacterial and fungal growth. **2. Why Other Options are Incorrect:** * **Eccrine glands:** These are the common sweat glands found over most of the body surface (e.g., palms, forehead) involved in thermoregulation. They are not found in the EAC. * **Sebaceous glands:** While sebaceous glands *are* present in the EAC and contribute the lipid component to earwax, the ceruminous glands themselves are specifically modified apocrine glands, not sebaceous. **Clinical Pearls for NEET-PG:** * **Location:** Ceruminous glands are found **only** in the outer 1/3 (cartilaginous part) of the EAC. Therefore, wax is never formed in the bony part unless pushed there by Q-tips. * **Ceruminoma:** A rare tumor arising from these glands. While often benign (pleomorphic adenoma), they can be malignant (adenoid cystic carcinoma). * **Protective Function:** Cerumen contains **Lysozyme and Immunoglobulins**, providing an immunological barrier against infection.

Q: Which anatomical region does this tumour arise from?

Hypotympanum. ***Hypotympanum*** - **Glomus jugulare tumors** (paragangliomas) characteristically arise from the **jugular bulb region** in the hypotympanum, below the level of the tympanic membrane. - These **vascular tumors** typically present as **pulsatile masses** extending from the **inferior portion** of the middle ear cavity. *Epitympanum* - The **epitympanum (attic)** is located **above the tympanic membrane** and typically involved by **cholesteatomas**, not paragangliomas. - **Glomus jugulare tumors** do not originate from this **superior compartment** of the middle ear. *Mesotympanum* - The **mesotympanum** is at the level of the **tympanic membrane** and is the site of **glomus tympanicum tumors**, which are smaller paragangliomas. - **Glomus jugulare** specifically arises from the **jugular bulb below** this level, not at the tympanic membrane level. *Inner ear* - The **inner ear** contains the **cochlea** and **vestibular system** and is not the origin of **glomus jugulare tumors**. - These tumors arise from **paraganglia** associated with the **jugular bulb** in the middle ear space, not inner ear structures.

Q: Which of the following is not a common site for paraganglioma?

Geniculate ganglion. **Explanation:** Paragangliomas (also known as glomus tumors) are neuroendocrine tumors arising from **extra-adrenal paraganglia**—clusters of neural crest cells associated with the autonomic nervous system. These cells are typically found near major blood vessels and specific cranial nerves. **Why Option D is Correct:** The **Geniculate ganglion** is a sensory ganglion of the Facial Nerve (CN VII) located at the first transition (first genu) of the nerve. It does not contain paraganglionic tissue. Therefore, it is not a site for paraganglioma. Tumors at this site are typically facial nerve schwannomas or hemangiomas. **Why the other options are incorrect:** * **A. Carotid bifurcation:** This is the most common site for head and neck paragangliomas, known as a **Carotid Body Tumor**. It typically presents as a painless, pulsatile neck mass (Fontaine’s sign positive). * **B. Jugular foramen:** This is the site for **Glomus Jugulare**, arising from the dome of the jugular bulb. It often involves cranial nerves IX, X, and XI. * **C. Promontory in the middle ear:** This is the site for **Glomus Tympanicum**, arising from the paraganglia along the tympanic branch of the glossopharyngeal nerve (Jacobson’s nerve). **Clinical Pearls for NEET-PG:** 1. **Rule of 10s:** 10% are familial, 10% are bilateral/multiple, and 10% are malignant (though head and neck paragangliomas are mostly benign). 2. **Phelps Sign:** Loss of bony outline between the carotid canal and jugular foramen (seen in Glomus Jugulare). 3. **Brown’s Sign:** Pulsation of the tympanic membrane that blanches with positive pressure (Pneumatic otoscopy). 4. **Aquino’s Sign:** Blanching of the tympanic mass on carotid artery compression. 5. **Investigation of Choice:** Contrast-enhanced MRI and MRA/MRV. On imaging, they show a characteristic **"Salt and Pepper" appearance**.

Q: A 11-year-old boy presented with increasing left-sided pain below his ear for 4 days along with high-grade fever. He also had nasal congestion for the past 3 weeks, coinciding with high pollen counts. The pain worsened despite decongestants and acetaminophen. The patient has a history of allergic rhinitis and multiple episodes of otitis media. On examination, there is tenderness and swelling of the left mastoid process and fluid behind the left tympanic membrane. CT scan of the concerned region was performed. Which of the following is the most likely diagnosis?

Acute mastoiditis. **Explanation:** **1. Why Acute Mastoiditis is Correct:** Acute mastoiditis is a common complication of **Acute Otitis Media (AOM)**, especially in children with pre-existing risk factors like allergic rhinitis and recurrent ear infections. The clinical triad of **fever, ear pain, and mastoid tenderness/swelling** (often with protrusion of the pinna) is classic. The pathophysiology involves the spread of infection from the middle ear to the mastoid air cells, leading to pus accumulation and bony destruction (coalescent mastoiditis). The CT scan (implied in the prompt) would typically show opacification of mastoid air cells and loss of bony septa. **2. Why Other Options are Incorrect:** * **Otitis Externa:** Presents with tragal tenderness and ear canal edema. While it causes pain, it does not typically cause mastoid swelling or fluid behind the tympanic membrane. * **Mucormycosis:** An invasive fungal infection usually seen in immunocompromised or diabetic patients. It typically presents with necrotic eschars in the nasal cavity or palate, not isolated mastoiditis in a child. * **Meningioma:** A slow-growing benign tumor. While it can occur in the posterior fossa, it would not present with acute fever, nasal congestion, and inflammatory mastoid swelling. **Clinical Pearls for NEET-PG:** * **Most common organism:** *Streptococcus pneumoniae* (followed by *H. influenzae* and *S. pyogenes*). * **Imaging of choice:** HRCT of the Temporal Bone (shows "clouding" of air cells). * **Reservoir Sign:** Sinking of the posterosuperior meatal wall is a characteristic finding. * **Management:** IV antibiotics (e.g., Ceftriaxone) + Myringotomy. If medical management fails or a subperiosteal abscess forms, a **Cortical Mastoidectomy (Schwartze operation)** is indicated.

Q: Crocodile tears are seen in which condition?

Abnormal VII nerve regeneration. **Explanation:** **Crocodile Tears Syndrome (Bogorad’s Syndrome)** is a rare complication occurring during the recovery phase of **Bell’s Palsy** or following traumatic injury to the Facial Nerve (CN VII). **Why the correct answer is right:** The underlying mechanism is **synkinesis** due to **abnormal/faulty regeneration of nerve fibers**. Normally, parasympathetic secretomotor fibers from the *superior salivatory nucleus* travel via the greater petrosal nerve to the submandibular ganglion to supply the salivary glands. Following injury proximal to the geniculate ganglion, these regenerating fibers are misdirected. Instead of reaching the salivary glands, they travel via the greater petrosal nerve to the **lacrimal gland**. Consequently, a gustatory stimulus (smelling or tasting food) that should trigger salivation instead triggers lacrimation (tearing). **Why the other options are wrong:** * **Frey’s Syndrome:** This involves abnormal regeneration of the **Auriculotemporal nerve** (branch of CN V3) following parotid surgery. It results in *gustatory sweating* and flushing of the cheek, not tearing. * **Conjunctivitis:** This is an inflammatory/infectious condition of the eye leading to reflex tearing due to irritation, not a neurological miswiring. * **Lacrimal Tumour:** These present with localized swelling, proptosis, or mechanical epiphora (overflow of tears) due to duct obstruction, but do not involve gustatory-linked tearing. **High-Yield Clinical Pearls for NEET-PG:** * **Site of Lesion:** Proximal to the geniculate ganglion. * **Treatment:** Injection of **Botulinum toxin** into the lacrimal gland is the gold standard for symptomatic relief. * **Frey’s Syndrome vs. Crocodile Tears:** Both are "gustatory" phenomena. Remember: **Frey’s = Sweating; Crocodile = Tearing.**

Q: Which abscess is related to the sternocleidomastoid muscle?

Bezold abscess. **Explanation:** The correct answer is **Bezold abscess**. This condition occurs as a complication of acute coalescent mastoiditis. When the mastoid tip is thin-walled and well-pneumatized, pus can erode through the inner aspect of the mastoid tip (at the digastric notch). The pus then tracks deep to the **sternocleidomastoid (SCM)** muscle, presenting as a painful, fluctuant swelling in the upper neck. **Analysis of Options:** * **Luc abscess:** This is a subperiosteal abscess resulting from the tracking of pus through the external auditory canal wall. It presents as a swelling in the ear canal, unrelated to the SCM. * **Citelli abscess:** This occurs when pus tracks through the mastoid tip but follows the posterior belly of the digastric muscle to the **digastric fossa**. It presents as a swelling in the occipital region/posterior neck. * **Parapharyngeal abscess:** This involves the lateral pharyngeal space. While it presents with neck swelling and trismus, its origin is typically odontogenic or tonsillar, not the mastoid tip. **High-Yield Clinical Pearls for NEET-PG:** * **Bezold Abscess:** Pus is deep to the SCM; the swelling is often firm because it is covered by the thick muscle and fascia. * **Citelli Abscess:** Pus tracks along the digastric muscle. * **Mastoiditis Triad:** Reservoir sign (ear canal refills with pus after mopping), sagging of the posterosuperior canal wall, and mastoid tenderness. * **Imaging:** Contrast-enhanced CT (CECT) is the gold standard for diagnosing these complications.

Q: What complication results from mastoid infection that erodes through the outer table of the bone?

Subperiosteal abscess. ### Explanation The correct answer is **Subperiosteal abscess**. #### 1. Why Subperiosteal Abscess is Correct Mastoiditis is an inflammation of the mastoid air cells. When the infection progresses, it can cause bone resorption (coalescent mastoiditis). If the infection erodes through the **outer (lateral) table** of the mastoid bone, pus escapes the bone but remains trapped beneath the periosteum of the mastoid process. This results in a **subperiosteal abscess**, which typically pushes the pinna **forward and downward** (proptosis of the auricle). #### 2. Why Other Options are Incorrect * **Epidural Abscess:** This occurs when the infection erodes through the **inner (medial) table** of the mastoid bone, leading to a collection of pus between the bone and the dura mater. It is an intracranial complication. * **Perichondritis:** This is an infection of the cartilage of the pinna (auricle), usually following trauma or surgery. It does not involve the mastoid bone or its outer table. * **Lateral Sinus Thrombosis:** This is an intracranial vascular complication caused by the spread of infection to the sigmoid sinus, usually via the destruction of the **sinus plate** (part of the inner table). #### 3. NEET-PG High-Yield Pearls * **Most common site:** The most frequent subperiosteal abscess is the **Post-auricular abscess**, located over the mastoid. * **Bezold’s Abscess:** Pus erodes through the mastoid tip into the **sternocleidomastoid muscle** sheath. * **Luc’s Abscess:** Pus erodes through the **posterior meatal wall** into the external auditory canal. * **Citelli’s Abscess:** Pus tracks into the **digastric triangle**. * **Radiology:** The "Gold Standard" for diagnosing mastoid complications is a **Contrast-Enhanced CT (CECT)** of the temporal bone, which shows the loss of bony septa (coalescence).

Q: A diabetic female patient presents with severe ear pain, granulation tissue in the external auditory canal, and facial palsy. What is the most likely diagnosis?

Malignant otitis externa. **Explanation:** The clinical presentation of a diabetic patient with severe otalgia, granulation tissue at the bony-cartilaginous junction of the external auditory canal (EAC), and cranial nerve involvement (facial palsy) is a classic description of **Malignant Otitis Externa (Necrotizing Otitis Externa).** 1. **Why Option A is Correct:** Malignant Otitis Externa is a life-threatening infection, typically caused by *Pseudomonas aeruginosa*, that occurs in elderly diabetics or immunocompromised individuals. The infection starts in the EAC and spreads to the skull base (osteomyelitis). The presence of **granulation tissue** is a hallmark sign. Facial nerve palsy indicates advanced disease and spread to the stylomastoid foramen. 2. **Why Other Options are Incorrect:** * **Option B (Herpes Zoster Oticus/Ramsay Hunt Syndrome):** While it presents with facial palsy and ear pain, it is characterized by **vesicular eruptions** in the concha and EAC, not granulation tissue. * **Option C (Otomycosis):** This is a fungal infection causing itching and debris (wet newspaper appearance). It does not cause bone destruction, granulation tissue, or cranial nerve palsies. **High-Yield Clinical Pearls for NEET-PG:** * **Organism:** *Pseudomonas aeruginosa* is the most common causative agent. * **Pathognomonic Sign:** Granulation tissue at the floor of the EAC (bony-cartilaginous junction). * **Investigation of Choice:** **CT scan** to assess bone destruction; **Technetium-99m scan** for early diagnosis (detects osteoblastic activity); **Gallium-67 scan** to monitor treatment response/resolution. * **Treatment:** Long-term intravenous anti-pseudomonal antibiotics (e.g., Ciprofloxacin, Ceftazidime) and strict glycemic control.

Question 1

Ceruminous glands are modified-

Accepted Answer

Apocrine glands

Answer

Eccrine glands

Answer

Sebaceous glands

Answer

None of the above

Question 2

A 70-year-old patient with long-standing type 2 diabetes mellitus presents with complaints of pain in the left ear with purulent drainage. On physical exam, the patient is afebrile. The pinna of the left ear is tender, and the external auditory canal is swollen and edematous. The peripheral white blood cell count is normal. What is the organism most likely to grow from the purulent drainage?

Accepted Answer

Pseudomonas aeruginosa

Answer

Staphylococcus aureus

Answer

Candida albicans

Answer

M. Tuberculosis

Question 3

Which anatomical region does this tumour arise from?

Accepted Answer

Hypotympanum

Answer

Epitympanum

Answer

Mesotympanum

Answer

Inner ear

Question 4

Which of the following is not a common site for paraganglioma?

Accepted Answer

Geniculate ganglion

Answer

Carotid bifurcation

Answer

Jugular foramen

Answer

Promontory in the middle ear

Question 5

A 11-year-old boy presented with increasing left-sided pain below his ear for 4 days along with high-grade fever. He also had nasal congestion for the past 3 weeks, coinciding with high pollen counts. The pain worsened despite decongestants and acetaminophen. The patient has a history of allergic rhinitis and multiple episodes of otitis media. On examination, there is tenderness and swelling of the left mastoid process and fluid behind the left tympanic membrane. CT scan of the concerned region was performed. Which of the following is the most likely diagnosis?

Accepted Answer

Acute mastoiditis

Answer

Otitis externa

Answer

Mucormycosis

Answer

Meningioma

Question 6

Crocodile tears are seen in which condition?

Accepted Answer

Abnormal VII nerve regeneration

Answer

Frey's syndrome

Answer

Conjunctivitis

Answer

Lacrimal tumour

Question 7

Which abscess is related to the sternocleidomastoid muscle?

Accepted Answer

Bezold abscess

Answer

Luc abscess

Answer

Citelli abscess

Answer

Parapharyngeal abscess

Question 8

What complication results from mastoid infection that erodes through the outer table of the bone?

Accepted Answer

Subperiosteal abscess

Answer

Epidural abscess

Answer

Perichondritis

Answer

Lateral sinus thrombosis

Question 9

A diabetic female patient presents with severe ear pain, granulation tissue in the external auditory canal, and facial palsy. What is the most likely diagnosis?

Accepted Answer

Malignant otitis externa

Answer

Herpes zoster otitis

Answer

Otomycosis

Answer

None of the above

Question 10

Malignant otitis externa is primarily due to which underlying condition?

Accepted Answer

Diabetes mellitus

Answer

Wax impaction

Answer

Hypertension

Answer

None of the above

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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