Diseases of the Nose and Paranasal Sinuses Practice Questions

Q: Killian's incision is used for?

Submucous resection of nasal septum. ### Explanation **Correct Answer: A. Submucous resection of nasal septum** **Why it is correct:** Killian’s incision is the classic incision used for **Submucous Resection (SMR)** of the nasal septum. It is a slanted, curvilinear incision made on the nasal septum, approximately **5 mm superior and posterior** to the caudal margin of the septal cartilage. It is specifically designed to bypass the columella and access the subperichondrial plane to remove the deflected bony and cartilaginous parts of the septum while preserving the mucosal flaps. **Analysis of Incorrect Options:** * **B. Intranasal antrostomy:** This procedure involves creating an opening in the inferior meatus to drain the maxillary sinus. It does not involve a septal incision. * **C. Caldwell-Luc operation:** This is a radical antrum operation where the maxillary sinus is accessed via a **sublabial incision** (in the gingivolabial sulcus) above the canine fossa. * **D. Myringoplasty:** This is an otological procedure used to repair a perforation of the tympanic membrane. Common incisions include the Wilde’s post-aural or Endaural (Lempert’s) incision. **High-Yield Clinical Pearls for NEET-PG:** * **Killian’s vs. Freer’s Incision:** While Killian’s is used for SMR, **Freer’s incision** (hemitransfixion incision) is made at the very **caudal border** of the septal cartilage and is the preferred incision for **Septoplasty**, especially when correcting caudal dislocations. * **SMR Contraindication:** SMR is generally avoided in children (usually below 17 years) as it can interfere with midfacial growth, leading to a saddle nose deformity. * **Complication:** The most common complication of SMR is a septal perforation, often occurring at the site of the incision if bilateral mucosal tears occur.

Q: Which of the following statements is NOT true about the frontal sinus?

It is present at birth.. **Explanation:** The correct answer is **D (It is present at birth)** because the frontal sinus is not anatomically present at birth. It is the last paranasal sinus to develop, typically appearing radiologically around the age of 5–7 years and reaching full adult size after puberty (around age 15–20). **Analysis of Options:** * **Option A (Osteomas are common):** This is a true statement. The frontal sinus is the most common site for paranasal sinus osteomas (benign bony tumors). They are often asymptomatic and discovered incidentally on imaging. * **Option B (Morning headaches):** This is a classic clinical feature of frontal sinusitis. It is often referred to as an **"Office Headache"**—the pain typically starts in the morning, peaks by midday as the sinus drains via gravity, and subsides by the evening. * **Option C (Opens into the middle meatus):** This is anatomically correct. The frontal sinus drains into the middle meatus via the frontonasal duct, which opens into the anterior part of the hiatus semilunaris or the ethmoid infundibulum. **NEET-PG High-Yield Pearls:** * **Developmental Sequence:** Ethmoid (present at birth) → Maxillary (present at birth, but rudimentary) → Sphenoid (appears age 3–5) → Frontal (appears age 5–7). * **Radiology:** The frontal sinus is the most common sinus to be **agenetic** (absent) in about 5-10% of the population. * **Complications:** Frontal sinusitis can lead to **Pott’s Puffy Tumor**, which is a subperiosteal abscess of the frontal bone presenting as a doughy swelling on the forehead.

Q: Which of the following is a complication of sinus disease?

Superior orbital fissure syndrome. **Explanation:** **Superior Orbital Fissure Syndrome (SOFS)** is a rare but serious complication of inflammatory or infectious sinus disease, particularly involving the **sphenoid sinus**. The sphenoid sinus is anatomically adjacent to the superior orbital fissure. When infection or inflammation spreads to this fissure, it compresses or affects the structures passing through it, leading to a characteristic clinical triad: 1. **Ophthalmoplegia:** Paralysis of Cranial Nerves III, IV, and VI (leading to a fixed, dilated pupil and loss of eye movement). 2. **Sensory Loss:** Anesthesia in the distribution of the Ophthalmic nerve (V1). 3. **Proptosis:** Due to venous congestion and muscle paralysis. **Why other options are incorrect:** * **Orbital Cellulitis & Cavernous Sinus Thrombosis (CST):** While these are indeed complications of sinusitis (ethmoid and sphenoid respectively), they are categorized as **orbital** and **intracranial** complications. In the context of specific "syndromes" arising from sinus disease extension, SOFS is a distinct clinical entity involving the bony fissure itself. * **Retrobulbar Neuritis:** This is an inflammation of the optic nerve (CN II). While it can rarely occur with sphenoiditis, the optic nerve passes through the **Optic Canal**, not the superior orbital fissure. If the optic nerve is involved along with SOFS, it is termed **Orbital Apex Syndrome**. **High-Yield NEET-PG Pearls:** * **Most common sinus causing orbital complications:** Ethmoid sinus (due to the thin *lamina papyracea*). * **Orbital Apex Syndrome:** SOFS + Optic nerve involvement (Vision loss/Blindness). * **Chandler’s Classification:** Used to grade orbital complications of sinusitis (Stage I: Preseptal cellulitis to Stage V: CST). * **Key differentiator:** In SOFS, vision is preserved; in Orbital Apex Syndrome, vision is lost.

Q: What is the most common complication of sinusitis?

Orbital cellulitis. **Explanation:** The paranasal sinuses are separated from the orbit by extremely thin bony barriers, most notably the **lamina papyracea** of the ethmoid bone. Due to this anatomical proximity and a shared venous drainage system (valveless ophthalmic veins), infections can easily spread from the sinuses to the orbit. **1. Why Orbital Cellulitis is Correct:** Orbital complications are the **most common** complications of acute sinusitis, occurring in approximately 80% of cases that extend beyond the sinus walls. Among these, the ethmoid sinus is the most frequent source in children, while the frontal sinus is more common in adults. The progression typically follows Chandler’s Classification, starting from preseptal cellulitis to orbital cellulitis and potentially orbital abscess. **2. Analysis of Incorrect Options:** * **B & C (Meningitis and Brain Abscess):** These are **intracranial complications**. While life-threatening, they are significantly less common than orbital complications. Meningitis is the most common intracranial complication, whereas a brain abscess (often in the frontal lobe) is the most common "space-occupying" intracranial complication. * **D (Septicemia):** This is a systemic spread of infection. While it can occur in severe, untreated cases or in immunocompromised patients, it is a rare primary complication compared to localized spread to the orbit. **Clinical Pearls for NEET-PG:** * **Most common sinus involved in orbital complications:** Ethmoid sinus. * **Most common intracranial complication:** Meningitis. * **Pott’s Puffy Tumor:** A high-yield term referring to osteomyelitis of the frontal bone with overlying soft tissue edema, usually secondary to frontal sinusitis. * **Cavernous Sinus Thrombosis:** A dreaded vascular complication characterized by bilateral symptoms, chemosis, and CN III, IV, and VI palsies.

Q: Caldwell-Luc operation is indicated for which condition?

Maxillary sinusitis. The **Caldwell-Luc operation** is a classic surgical procedure designed to provide direct access to the **maxillary sinus**. It involves creating an opening in the canine fossa (above the premolar teeth) to enter the sinus, followed by the creation of an intranasal antrostomy for drainage. ### Why Maxillary Sinusitis is Correct: The procedure is specifically indicated for chronic maxillary sinusitis that is unresponsive to conservative management or endoscopic approaches. It allows for the complete removal of irreversible diseased mucosa, polyps, or foreign bodies (like a displaced tooth root) from the maxillary antrum. It is also the approach used for biopsy of maxillary tumors and for the **Denker’s operation** (an extension for reaching the nasopharynx). ### Why Other Options are Incorrect: * **Frontal Sinusitis:** Managed via procedures like the Lynch-Howarth operation, Trephination, or more commonly, Functional Endoscopic Sinus Surgery (FESS). * **Ethmoid Sinusitis:** Addressed via internal or external ethmoidectomy (e.g., Patterson’s or Jansen-Horgan approach). * **Sphenoid Sinusitis:** Accessed via transnasal or transethmoidal routes, often using endoscopic techniques. ### High-Yield Clinical Pearls for NEET-PG: * **Key Indications:** Chronic maxillary sinusitis with irreversible changes, Oro-antral fistula closure, and removal of **Antrochoanal polyps** (to prevent recurrence by removing the base). * **Common Complication:** Numbness of the cheek or upper teeth due to injury to the **infraorbital nerve**. * **Current Status:** Largely replaced by **FESS** (Functional Endoscopic Sinus Surgery), which is more physiological and less invasive. * **Landmark:** The incision is made in the gingivolabial sulcus, lateral to the frenulum.

Q: Which of the following is NOT a characteristic of Rhinoscleroma?

Caused by a fungus. **Explanation:** Rhinoscleroma is a chronic, progressive granulomatous disease of the upper respiratory tract. The correct answer is **B** because Rhinoscleroma is caused by a **bacterium**, specifically ***Klebsiella pneumoniae subsp. rhinoscleromatis*** (Frisch Bacillus), not a fungus. **Analysis of Options:** * **Option A (Mikulicz cells):** This is a hallmark histopathological feature. These are large, foamy histocytes (macrophages) with a vacuolated cytoplasm containing the causative bacilli. * **Option B (Correct):** As stated, the etiology is bacterial (Gram-negative, encapsulated coccobacillus). * **Option C (Geographic distribution):** In India, the disease is endemic and significantly more common in **northern areas** (e.g., Rajasthan, Punjab, Haryana) compared to the south. * **Option D (Woody nose):** During the **proliferative/hypertrophic stage**, there is extensive formation of hard, non-tender granulomatous tissue. This leads to a characteristic "woody" or "stony" hardness of the nose and may cause widening of the nasal bridge (Hebra nose). **High-Yield Clinical Pearls for NEET-PG:** * **Stages:** It progresses through three stages: 1. Atrophic (mimics atrophic rhinitis), 2. Granulomatous/Proliferative (nodule formation), and 3. Cicatricial (scarring and stenosis). * **Pathology:** Look for **Mikulicz cells** and **Russell bodies** (eosinophilic inclusion bodies representing degenerated plasma cells). * **Treatment:** Long-term antibiotics are required. **Streptomycin and Tetracycline** are the traditional drugs of choice; Ciprofloxacin is also effective. * **Biopsy:** It is the definitive diagnostic tool.

Question 1

A 2-year-old patient presents with pain over the bridge of the nose, medial and deep to the eye, aggravated by eyeball movements. The patient also complains of nasal discharge. Examination reveals edema of both eyelids and swelling of the middle turbinate. Involvement of which of the following paranasal sinuses is suspected?

Accepted Answer

Ethmoid Sinus

Answer

Maxillary Sinus

Answer

Frontal sinus

Answer

Sphenoid sinus

Question 2

Zygomycosis, a destructive fungal infection of the sinuses, is likely to reach the brain by which of the following routes?

Accepted Answer

Cavernous sinus

Answer

External carotid artery

Answer

Internal carotid artery

Answer

Superior sagittal sinus

Question 3

Cyanosis in a newborn that disappears on crying is seen in which condition?

Accepted Answer

Bilateral choanal atresia

Answer

Laryngocoele

Answer

Unilateral choanal atresia

Answer

Foreign body in the airway

Question 4

Killian's incision is used for?

Accepted Answer

Submucous resection of nasal septum

Answer

Intranasal antrostomy

Answer

Caldwell-Luc operation

Answer

Myringoplasty

Question 5

Which of the following statements is NOT true about the frontal sinus?

Accepted Answer

It is present at birth.

Answer

Osteomas are common.

Answer

Sinusitis can lead to morning headaches.

Answer

It opens into the middle meatus.

Question 6

Which of the following is a complication of sinus disease?

Accepted Answer

Superior orbital fissure syndrome

Answer

Retrobulbar neuritis

Answer

Orbital cellulitis

Answer

Cavernous sinus thrombosis

Question 7

What does the arterial ligation of the pterygoid plexus constitute?

Accepted Answer

Anastomosis between a branch of the maxillary artery and a branch of the facial artery

Answer

Anastomoses between two branches of the facial artery

Answer

Anastomoses between two branches of the maxillary artery

Answer

None of the above

Question 8

What is the most common complication of sinusitis?

Accepted Answer

Orbital cellulitis

Answer

Meningitis

Answer

Brain abscess

Answer

Septicemia

Question 9

Caldwell-Luc operation is indicated for which condition?

Accepted Answer

Maxillary sinusitis

Answer

Frontal sinusitis

Answer

Ethmoid sinusitis

Answer

Sphenoid sinusitis

Question 10

Which of the following is NOT a characteristic of Rhinoscleroma?

Accepted Answer

Caused by a fungus

Answer

Presence of Mikulicz cells

Answer

More common in northern areas

Answer

Characterized by a 'woody nose'

Diseases of the Nose and Paranasal Sinuses — MCQs

Diseases of the Nose and Paranasal Sinuses — MCQs

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