Diseases of the Nose and Paranasal Sinuses Practice Questions

Q: The Caldwell-Luc approach is used to access which sinus?

Maxillary sinus. **Explanation:** The **Caldwell-Luc operation** (also known as radical antral surgery) is a classic surgical procedure used to access the **maxillary sinus**. The approach involves making a sublabial incision in the gingivobuccal sulcus above the canine fossa. A bony window is then created in the anterior wall of the maxilla to gain direct visualization and access to the sinus cavity. **Why the other options are incorrect:** * **Frontal Sinus:** Accessed via procedures like the Lynch-Howarth incision (external) or the endoscopic Draf procedures. * **Sphenoid Sinus:** Typically reached via a transnasal or transethmoidal approach, or through a sublabial transseptal route (often for pituitary surgery). * **Ethmoid Sinus:** Accessed via an external ethmoidectomy (Lynch’s incision) or, more commonly today, through Functional Endoscopic Sinus Surgery (FESS). **Clinical Pearls for NEET-PG:** * **Indications:** Chronic maxillary sinusitis (not responding to FESS), removal of foreign bodies (e.g., a displaced tooth root), management of oro-antral fistulae, and as a route to the pterygopalatine fossa (Maxillary artery ligation). * **Key Landmark:** The incision is made in the **canine fossa** because the bone is thinnest here, lateral to the canine eminence. * **Complications:** The most common complication is **numbness/paresthesia** of the cheek and upper teeth due to injury to the **infraorbital nerve**. * **Current Status:** While largely replaced by FESS for routine sinusitis, it remains high-yield for exams regarding its anatomical approach and specific indications like the **Antrochoanal polyp** (to remove the site of origin).

Q: An opening in a Caldwell-Luc operation is made in which of the following?

Canine fossa. ### Explanation **Correct Answer: C. Canine Fossa** The **Caldwell-Luc operation** is a surgical procedure used to access the maxillary sinus. The primary opening is made in the **canine fossa**, which is the thinnest part of the anterior wall of the maxilla, located just above the roots of the premolar teeth. This approach provides a direct view of the sinus cavity for the removal of irreversible mucosal disease, polyps, or foreign bodies. **Why the other options are incorrect:** * **Middle Meatus (A):** This is the site for Functional Endoscopic Sinus Surgery (FESS) and the location of the natural maxillary ostium. While a Caldwell-Luc procedure often involves creating a counter-opening, the initial surgical entry is not here. * **Inferior Meatus (B):** In a Caldwell-Luc procedure, an **intranasal antrostomy** is typically created in the inferior meatus to ensure permanent dependent drainage. However, this is a secondary step; the primary surgical access (the "opening") is through the canine fossa. * **Dental Sulcus (D):** While the incision is made in the gingivolabial sulcus (above the teeth), the actual "opening" into the bony sinus is made through the canine fossa. **High-Yield Clinical Pearls for NEET-PG:** * **Indications:** Recurrent maxillary sinusitis, removal of an antrochoanal polyp (to address the base), or retrieval of a root of a tooth from the sinus. * **Nerve at Risk:** The **infraorbital nerve** must be protected during the procedure to avoid numbness of the cheek and upper lip. * **Contraindication:** It is generally avoided in children (usually <12 years) because it can damage the permanent tooth buds. * **Modern Context:** Largely replaced by FESS, but still relevant for specific pathologies like tumors or trauma.

Q: Young's operation is indicated for which condition?

Atrophic rhinitis. **Explanation:** **Atrophic Rhinitis** is a chronic inflammatory condition characterized by atrophy of the nasal mucosa and turbinates, leading to a paradoxically wide nasal cavity filled with foul-smelling crusts (ozaena). **Young’s operation** is a surgical treatment based on the principle of giving "rest" to the nasal mucosa. By surgically closing the nostrils (using circular skin flaps) for a period of 6 to 12 months, the constant drying effect of inspired air is eliminated. This allows the cilia to recover, the mucosa to revert to a more normal respiratory type, and the crusting to disappear. **Analysis of Incorrect Options:** * **Rhinophyma:** This is a benign skin deformity of the nose caused by hypertrophy of sebaceous glands (end-stage acne rosacea). Treatment involves surgical debulking or CO2 laser resurfacing, not closure of the airway. * **Rhinitis Sicca:** A milder form of dry nose often seen in hot, dusty environments. It lacks the severe atrophy and fetid odor of atrophic rhinitis and is managed conservatively with lubricants and saline. * **Hypertrophic Rhinitis:** Characterized by permanent thickening of the mucosa and turbinates, causing nasal obstruction. Treatment involves reducing the size of the turbinates (e.g., partial turbinectomy or laser reduction), the opposite of the "widening" seen in atrophic rhinitis. **High-Yield Clinical Pearls for NEET-PG:** * **Modified Young’s Operation:** To avoid the psychological distress of total nasal closure, a small 3mm opening is left to allow minimal airflow. * **Merciful Anosmia:** Patients with atrophic rhinitis cannot smell their own foul odor because their olfactory epithelium has atrophied. * **Organism:** *Klebsiella ozaenae* (Abel’s bacillus) is commonly associated. * **Bernoulli’s Principle:** Explains why patients feel obstructed despite a wide cavity; the lack of resistance prevents the sensory feedback of breathing.

Q: Which paranasal sinus is most commonly involved in a patient presenting with symptoms of a toothache and sinusitis?

Maxillary sinus. **Explanation:** The **Maxillary sinus** is the correct answer due to its unique anatomical relationship with the oral cavity. The floor of the maxillary sinus is formed by the alveolar process of the maxilla, which lies in close proximity to the roots of the maxillary teeth (specifically the **2nd premolar and 1st and 2nd molars**). 1. **Referred Pain:** Because the maxillary sinus and the upper teeth share a common nerve supply via the **Superior Alveolar Nerve** (a branch of the Maxillary nerve, V2), inflammation within the sinus (sinusitis) can be perceived as a toothache. 2. **Odontogenic Sinusitis:** Approximately 10–12% of maxillary sinusitis cases are "odontogenic," meaning they are caused by dental infections, periapical abscesses, or complications from dental extractions. **Analysis of Incorrect Options:** * **Ethmoid Sinus:** Primarily presents with pain at the bridge of the nose or medial canthus of the eye. * **Frontal Sinus:** Typically presents with a "frontal headache" or pain above the eyebrows, often showing a characteristic "office headache" pattern (worse in the morning, better in the evening). * **Sphenoid Sinus:** Pain is usually referred to the vertex (top of the head), occiput, or retro-orbital region. **High-Yield Clinical Pearls for NEET-PG:** * **First sinus to develop:** Ethmoid (present at birth). * **Largest paranasal sinus:** Maxillary (Antrum of Highmore). * **Most common sinus involved in adult sinusitis:** Maxillary sinus. * **Most common sinus involved in childhood sinusitis:** Ethmoid sinus. * **Drainage:** The maxillary sinus drains into the **middle meatus** via the hiatus semilunaris. Its drainage is physiologically disadvantaged because the ostium is located superiorly on its medial wall.

Q: Kiesselbach's plexus is situated on which part of the nasal cavity?

Medial wall of the nasal cavity. **Explanation:** **Kiesselbach’s Plexus** (also known as Little’s area) is a highly vascularized region located on the **anteroinferior part of the nasal septum**, which forms the **medial wall of the nasal cavity**. This area is the most common site for epistaxis (nosebleeds), accounting for approximately 90% of cases. The plexus is formed by the anastomosis of four (sometimes five) major arteries: 1. **Anterior Ethmoidal Artery** (from Internal Carotid) 2. **Sphenopalatine Artery** (from External Carotid) 3. **Greater Palatine Artery** (from External Carotid) 4. **Superior Labial Artery** (from External Carotid) **Analysis of Incorrect Options:** * **Option A:** The medial wall of the middle ear contains structures like the promontory and the oval window, not a vascular plexus related to the nose. * **Option B:** The lateral wall of the nasopharynx contains the opening of the Eustachian tube and the Fossa of Rosenmüller (common site for Nasopharyngeal Carcinoma). * **Option D:** The laryngeal aspect of the epiglottis is part of the upper airway and is not involved in nasal vascularity. **Clinical Pearls for NEET-PG:** * **Woodruff’s Plexus:** Located on the lateral wall of the nasal cavity posteriorly (near the sphenopalatine foramen); it is the most common site for **posterior epistaxis** in elderly patients. * **First-line treatment** for bleeding from Kiesselbach’s plexus is Trotter’s method (pinching the nose and leaning forward) or chemical cautery with Silver Nitrate. * **Artery of Epistaxis:** The Sphenopalatine artery is clinically referred to as the "Artery of Epistaxis."

Q: What is the treatment of choice for antrochoanal polyp?

Endoscopic removal. **Explanation:** An **Antrochoanal Polyp (Killian’s Polyp)** is a solitary polyp that arises from the mucosa of the maxillary sinus (usually near the accessory ostium), passes through the natural or accessory ostium into the middle meatus, and extends posteriorly into the choana and nasopharynx. **Why Endoscopic Removal is the Treatment of Choice:** Functional Endoscopic Sinus Surgery (FESS) is the gold standard. It allows for the precise identification of the polyp’s stalk and its point of origin within the maxillary sinus. By widening the natural ostium (middle meatal antrostomy), the surgeon can ensure complete removal of the antral portion, which is crucial to **prevent recurrence**. It is minimally invasive, preserves sinus physiology, and has lower morbidity compared to open procedures. **Analysis of Incorrect Options:** * **Caldwell-Luc Operation:** Historically used to remove the antral part of the polyp via the canine fossa. While effective for preventing recurrence, it is now reserved for recurrent cases or when endoscopic access is impossible, as it carries risks of infraorbital nerve injury and dental damage. * **Intranasal Polypectomy:** This involves simple avulsion of the nasal part of the polyp. It is considered inadequate because it fails to remove the antral base, leading to a very high recurrence rate. **High-Yield Clinical Pearls for NEET-PG:** * **Origin:** Most commonly from the posterior/lateral wall or floor of the **maxillary sinus**. * **Components:** It has three parts—Antral, Nasal, and Choanal. * **Radiology:** On X-ray (Water’s view) or CT, it appears as a hazy maxillary sinus with a soft tissue mass extending into the nasopharynx. * **Differential Diagnosis:** Must be differentiated from a juvenile nasopharyngeal angiofibroma (JNA) in adolescent males; however, AC polyps are typically avascular and do not bleed on touch.

Q: Woody induration of rhinoscleroma is initially seen at which stage?

Granulomatous stage. **Rhinoscleroma** is a chronic granulomatous disease caused by *Klebsiella rhinoscleromatis* (Frisch bacillus). It typically progresses through four distinct clinical stages. ### **Explanation of the Correct Answer** The **Granulomatous stage** (Stage 3) is characterized by the formation of painless, non-ulcerating nodules in the nasal mucosa. These nodules coalesce to form a dense, hard mass, leading to the classic **"woody induration"** of the nose. This stage is histologically significant for the presence of **Mikulicz cells** (foamy macrophages containing the bacilli) and **Russell bodies** (eosinophilic inclusion bodies). ### **Analysis of Incorrect Options** * **A. Catarrhal stage:** This is the initial stage, presenting like a common cold with foul-smelling purulent nasal discharge and crusting. There is no induration here. * **B. Atrophic stage:** This stage mimics Atrophic Rhinitis, characterized by foul-smelling crusts and a roomy nasal cavity. The tissues are thinning rather than hardening. * **D. Cicatricial stage:** This is the final stage of healing by fibrosis. While it causes severe stenosis (e.g., of the nares or nasopharynx) and adhesions, the characteristic "woody" granulomatous mass is a feature of the preceding stage. ### **NEET-PG High-Yield Pearls** * **Organism:** *Klebsiella rhinoscleromatis* (Gram-negative, diplobacillus). * **Biopsy Findings:** Mikulicz cells (diagnostic) and Russell bodies (non-specific). * **Clinical Sign:** "Hebra Nose" (widening of the nasal bridge due to granuloma). * **Treatment of Choice:** Streptomycin and Tetracycline (or Ciprofloxacin) for long durations (weeks to months). * **Site:** It most commonly starts in the subepithelial layer of the anterior nares/nasal septum.

Question 1

The Caldwell-Luc approach is used to access which sinus?

Accepted Answer

Maxillary sinus

Answer

Frontal sinus

Answer

Sphenoid sinus

Answer

Ethmoid sinus

Question 2

An opening in a Caldwell-Luc operation is made in which of the following?

Accepted Answer

Canine fossa

Answer

Middle meatus

Answer

Inferior meatus

Answer

Dental sulcus

Question 3

Young's operation is indicated for which condition?

Accepted Answer

Atrophic rhinitis

Answer

Rhinophyma

Answer

Rhinitis sicca

Answer

Hypertrophic rhinitis

Question 4

Which paranasal sinus is most commonly involved in a patient presenting with symptoms of a toothache and sinusitis?

Accepted Answer

Maxillary sinus

Answer

Ethmoid sinus

Answer

Frontal sinus

Answer

Sphenoid sinus

Question 5

A 10-year-old girl has had symptoms consistent with a cold for 14 days. In the 2 days prior to her office visit, she developed a fever of 39°C (102.2°F), purulent nasal discharge, facial pain, and a daytime cough. Examination of the nose after topical decongestants shows pus in the middle meatus. Which of the following is the most likely diagnosis?

Accepted Answer

Maxillary sinusitis

Answer

Brain abscess

Answer

Streptococcal throat infection

Answer

Sphenoid sinusitis

Question 6

CSF rhinorrhea is seen in which of the following types of Lefort fractures?

Accepted Answer

Nasal fractures

Answer

Lefort type I

Answer

Nasoethmoid fractures

Answer

Frontozygomatic fractures

Question 7

Kiesselbach's plexus is situated on which part of the nasal cavity?

Accepted Answer

Medial wall of the nasal cavity

Answer

Medial wall of the middle ear

Answer

Lateral wall of the nasopharynx

Answer

Laryngeal aspect of the epiglottis

Question 8

What is the treatment of choice for antrochoanal polyp?

Accepted Answer

Endoscopic removal

Answer

Caldwell-Luc operation

Answer

Intranasal polypectomy

Answer

None of the above

Question 9

An 18-year-old girl presented with multiple nasal polypi in both nostrils, nasal obstruction, and sinusitis. CT scan shows dense shadows in the sinuses. Histopathology did not show fungal invasion of tissues. Which of the following treatments is NOT indicated?

Accepted Answer

Amphotericin B

Answer

Intranasal corticosteroids

Answer

Surgical removal

Answer

Anti-histamines

Question 10

Woody induration of rhinoscleroma is initially seen at which stage?

Accepted Answer

Granulomatous stage

Answer

Catarrhal stage

Answer

Strophic stage

Answer

Cicatricial stage

Diseases of the Nose and Paranasal Sinuses — MCQs

Diseases of the Nose and Paranasal Sinuses — MCQs

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