Diseases of the Nose and Paranasal Sinuses — MCQs

A 32-year-old male patient complains of swelling in the left maxillary region with heaviness in the maxillary sinus following the extraction of a maxillary first molar one week prior. The extraction was performed using the transalveolar method. What is the average mucociliary airflow transport in the maxillary sinus?

Q174Medium

A patient presents with multiple bilateral nasal polyps and radiographic evidence of paranasal sinus opacities. Which of the following treatments would NOT be indicated?

Q175Easy

Malignant tumors are commonest in which of the following paranasal sinuses?

Q176Easy

Which of the following is FALSE regarding a nasolabial cyst?

Q177Medium

A black necrotic mass is seen in the nose of an elderly diabetic patient. What is the most probable diagnosis?

Q178Easy

Strawberry skin appearance of the nasal mucosa is seen in which of the following conditions?

Q179Easy

What is the most common nasal mass?

Q180Medium

All of the following are associated with decreased sense of smell EXCEPT?

Diseases of the Nose and Paranasal Sinuses Indian Medical PG Practice Questions and MCQs

Question 171: What is the prerequisite imaging study for Endoscopic Sinus Surgery?

A. MRI of paranasal sinus
B. CT of PNS (Correct Answer)
C. Mucocilliary clearing testing
D. Acoustic tests

Explanation: ### Explanation **Correct Option: B. CT of PNS** Computed Tomography (CT) of the Paranasal Sinuses (PNS) is the **gold standard** and mandatory prerequisite for Functional Endoscopic Sinus Surgery (FESS). * **Medical Concept:** FESS relies on a detailed understanding of the complex, variable bony anatomy of the ethmoid labyrinth. CT provides superior **spatial resolution of bony landmarks**, such as the lamina papyracea, the skull base (cribriform plate), and the relationship of the optic nerve and carotid artery to the sphenoid sinus. * It acts as a "road map" for the surgeon to navigate safely, minimize complications (like CSF leaks or orbital injury), and identify anatomical variants (e.g., Onodi cells, Haller cells). The preferred protocol is a **Non-contrast CT (NCCT) with Coronal, Axial, and Sagittal reformations.** **Why other options are incorrect:** * **A. MRI of PNS:** While excellent for soft tissue detail (e.g., differentiating tumor from retained secretions or fungal debris), MRI does not visualize the fine bony partitions of the sinuses required for surgical navigation. * **C. Mucociliary clearing testing:** (e.g., Saccharin test) assesses the functional health of the nasal cilia (relevant in Kartagener’s syndrome) but provides no anatomical information for surgery. * **D. Acoustic tests:** (e.g., Acoustic Rhinometry) measure the cross-sectional area and volume of the nasal cavity; they are physiological assessments, not surgical roadmaps. **High-Yield Clinical Pearls for NEET-PG:** * **Keros Classification:** Used on CT to assess the depth of the olfactory fossa; Class III (deepest) carries the highest risk of intracranial entry during surgery. * **Timing:** CT should ideally be performed after a course of medical management to ensure that mucosal edema is minimized, allowing for better visualization of the underlying anatomy. * **Checklist:** Always look for the **Dehiscence of the Lamina Papyracea** and the **position of the Anterior Ethmoidal Artery** on the preoperative CT.

Question 172: Orbital cellulitis is a complication of?

A. Parasinusitis
B. Faciomaxillary trauma
C. Endoscopic sinus surgery (Correct Answer)
D. All of these

Explanation: **Explanation:** Orbital cellulitis is a serious condition characterized by inflammation of the tissues behind the orbital septum. While it can occur due to various etiologies, in the context of this specific question and surgical complications, **Endoscopic Sinus Surgery (ESS)** is a recognized and significant cause. 1. **Why Option C is Correct:** During ESS, the surgeon operates in close proximity to the **lamina papyracea** (the thin bony plate of the ethmoid bone). Accidental penetration or injury to this bone allows infection, blood, or air to enter the orbit from the ethmoid sinuses. This can lead to rapid onset of orbital cellulitis, orbital hematoma, or even blindness if not managed immediately. 2. **Why Options A and B are Incorrect:** * **Parasinusitis (Option A):** While acute ethmoiditis is the *most common cause* of orbital cellulitis in children, the term "parasinusitis" is non-specific. In the hierarchy of surgical complications frequently tested in NEET-PG, ESS is prioritized as a direct iatrogenic cause. * **Faciomaxillary Trauma (Option B):** Trauma typically leads to orbital fractures (like blowout fractures) or orbital hematomas. While secondary infection can occur, it is less common as a primary presentation compared to the direct spread seen in sinus pathology or surgical breach. * **Option D:** Since ESS is the most definitive surgical complication listed, "All of these" is often avoided in favor of the most direct clinical association. **High-Yield Clinical Pearls for NEET-PG:** * **Most common sinus involved:** Ethmoid sinus (due to the thinness of the lamina papyracea). * **Chandler’s Classification:** Used to grade orbital complications (I: Preseptal cellulitis; II: Orbital cellulitis; III: Subperiosteal abscess; IV: Orbital abscess; V: Cavernous sinus thrombosis). * **Early Sign of Orbital Injury during ESS:** Fat protrusion into the nasal cavity (the "fat pad sign") or orbital ecchymosis. * **Management:** If orbital tension increases during surgery, an immediate **medial orbital decompression** or **lateral canthotomy** may be required.

Question 173: A 32-year-old male patient complains of swelling in the left maxillary region with heaviness in the maxillary sinus following the extraction of a maxillary first molar one week prior. The extraction was performed using the transalveolar method. What is the average mucociliary airflow transport in the maxillary sinus?

A. 5 to 20 mm per min (Correct Answer)
B. 5 to 20 cm per min
C. 5 to 20 km per min
D. 5 to 20 dm per min

Explanation: ### Explanation **1. Understanding the Correct Answer (A):** The maxillary sinus is lined with **pseudostratified ciliated columnar epithelium**. The primary defense mechanism of the paranasal sinuses is the **mucociliary clearance (MCC)** system. In the maxillary sinus, the cilia beat in a coordinated fashion to move the mucus blanket toward the natural ostium (located superiorly in the hiatus semilunaris). The average physiological speed of this mucociliary transport is **5 to 20 mm per minute**. This rate ensures efficient removal of debris, bacteria, and foreign bodies (like dental fragments or inflammatory exudate) to prevent sinusitis. **2. Analysis of Incorrect Options:** * **Option B (5 to 20 cm per min):** This speed is too fast. At 20 cm/min, the entire sinus would be cleared in seconds, which is physiologically impossible for microscopic cilia. * **Option C (5 to 20 km per min):** This is an astronomical speed, faster than a commercial jet, and is physically impossible in biological tissues. * **Option D (5 to 20 dm per min):** A decimeter (dm) is 10 cm. This remains significantly higher than the actual biological rate of ciliary movement. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Direction of Flow:** Ciliary action in the maxillary sinus always moves toward the **natural ostium**, regardless of whether an accessory ostium or a surgical opening (like an inferior meatal antrostomy) is present. * **Oroantral Fistula (OAF):** The clinical scenario describes a potential OAF or sinusitis following a **maxillary first molar** extraction. The first molar is the tooth most commonly associated with the maxillary sinus floor. * **Factors affecting MCC:** Ciliary movement is inhibited by cigarette smoke, cold air, hypoxia, and certain drugs (e.g., cocaine). * **Kartagener’s Syndrome:** A classic exam topic where MCC is absent due to dynein arm defects, leading to chronic sinusitis and bronchiectasis.

Question 174: A patient presents with multiple bilateral nasal polyps and radiographic evidence of paranasal sinus opacities. Which of the following treatments would NOT be indicated?

A. Epinephrine
B. Corticosteroids
C. Amphotericin B (Correct Answer)
D. Antihistamines

Explanation: ### Explanation **Correct Answer: C. Amphotericin B** **1. Why Amphotericin B is the Correct Answer:** The clinical presentation of multiple bilateral nasal polyps and sinus opacities is characteristic of **Chronic Rhinosinusitis with Nasal Polyposis (CRSwNP)**. This condition is primarily an inflammatory process, often associated with Type 2 helper T-cell (Th2) inflammation. **Amphotericin B** is a potent antifungal medication used for invasive fungal infections (like Mucormycosis) or Allergic Fungal Rhinosinusitis (AFRS) in specific surgical contexts. However, it is **not** a standard or indicated treatment for routine bilateral nasal polyps, as these are non-infectious inflammatory growths. **2. Analysis of Other Options:** * **B. Corticosteroids:** These are the **mainstay of treatment**. They reduce the size of polyps by decreasing mucosal edema and suppressing the inflammatory cascade. Both topical (sprays) and systemic steroids are used. * **D. Antihistamines:** These are indicated if the nasal polyps are associated with underlying allergic rhinitis, helping to control symptoms like sneezing and rhinorrhea. * **A. Epinephrine:** While not a long-term treatment, topical epinephrine (or other sympathomimetics) is used as a **decongestant** to shrink the nasal mucosa during clinical examination or endonasal surgery to improve visualization. **3. High-Yield Clinical Pearls for NEET-PG:** * **Ethmoidal Polyps:** Usually bilateral, multiple, and pearly white. They are common in adults. * **Antrochoanal Polyps:** Usually unilateral, single, and originate from the maxillary sinus. Common in children. * **Samter’s Triad:** Aspirin sensitivity, Asthma, and Nasal Polyposis (High-yield association). * **Kartagener’s Syndrome:** Situs inversus, Bronchiectasis, and Sinusitis/Polyps due to ciliary dyskinesia. * **Investigation of Choice:** Non-contrast CT scan of the Paranasal Sinuses (Coronal view).

Question 175: Malignant tumors are commonest in which of the following paranasal sinuses?

A. Maxillary (Correct Answer)
B. Frontal
C. Ethmoidal
D. Sphenoidal

Explanation: **Explanation:** The correct answer is **A. Maxillary**. **1. Why Maxillary Sinus is Correct:** The maxillary sinus is the largest of the paranasal sinuses and is the most common site for both benign and malignant neoplasms. Statistically, approximately **80% of all paranasal sinus malignancies** occur in the maxillary sinus. The most common histological type found here is **Squamous Cell Carcinoma (SCC)**. These tumors often present late because the sinus is a large, hollow space, allowing the tumor to grow significantly before causing symptoms like cheek swelling, nasal obstruction, or epistaxis. **2. Why Other Options are Incorrect:** * **Ethmoidal Sinus:** This is the second most common site (approx. 10-15%). Adenocarcinoma is notably associated with the ethmoid sinuses, particularly in workers exposed to wood dust. * **Frontal Sinus:** Malignancies here are rare (approx. 1-2%). This sinus is more commonly associated with benign osteomas. * **Sphenoidal Sinus:** This is the rarest site for primary paranasal malignancies (<1%). Due to its deep location, tumors here often present with cranial nerve palsies or headache. **3. NEET-PG High-Yield Pearls:** * **Ohngren’s Line:** A theoretical line connecting the medial canthus of the eye to the angle of the mandible. Tumors **posterosuperior** to this line have a worse prognosis due to early involvement of the skull base and orbit. * **Most common histology:** Squamous Cell Carcinoma (overall). * **Woodworkers/Furniture industry:** Strongly associated with **Adenocarcinoma** of the Ethmoid sinus. * **Nickel/Leather workers:** Increased risk of Sinonasal Squamous Cell Carcinoma. * **Inverting Papilloma:** A benign but locally aggressive tumor (lateral wall of nose) with a high risk of malignant transformation into SCC.

Question 176: Which of the following is FALSE regarding a nasolabial cyst?

A. Also known as a Klestadt cyst
B. It is odontogenic in origin (Correct Answer)
C. It is treated by excision
D. It is seen in the region of the nasolabial fold

Explanation: ### Explanation **Nasolabial Cyst (Klestadt’s Cyst)** The correct answer is **B**, as nasolabial cysts are **non-odontogenic** in origin. **1. Why Option B is False (The Correct Answer):** Nasolabial cysts are developmental, non-odontogenic cysts. They arise from the remnants of the **nasolacrimal duct** or from trapped epithelial remnants at the junction of the globular, lateral nasal, and maxillary processes. Since they do not originate from tooth-forming tissues (the dental lamina), they are classified as soft-tissue cysts, not odontogenic cysts. **2. Analysis of Other Options:** * **Option A (Klestadt’s Cyst):** This is the eponymous name for a nasolabial cyst. It is a classic synonym frequently tested in PG entrance exams. * **Option C (Treated by excision):** The standard treatment is surgical excision, typically via a **sublabial approach** (Caldwell-Luc type incision). Small asymptomatic cysts may be observed, but symptomatic ones require removal. * **Option D (Region of the nasolabial fold):** These cysts are characteristically located in the soft tissue of the nasolabial fold, deep to the ala of the nose. **3. Clinical Pearls for NEET-PG:** * **Presentation:** Typically presents as a slow-growing, painless swelling in the nasolabial region, causing **ala flare** and loss of the nasolabial fold. * **Demographics:** Most common in females (4:1 ratio) in the 4th to 6th decades of life. * **Radiology:** Unlike odontogenic cysts, these are **soft-tissue cysts**. Therefore, they usually do not show any bony changes on X-ray, though they may cause pressure erosion (scalloping) of the underlying maxilla in chronic cases. * **Physical Exam:** Bimanual palpation reveals a fluctuant swelling with one finger in the labial sulcus and the other in the nasal vestibule.

Question 177: A black necrotic mass is seen in the nose of an elderly diabetic patient. What is the most probable diagnosis?

A. Lupus vulgaris
B. Aspergillosis
C. Mucormycosis (Correct Answer)
D. Pseudomonas infection

Explanation: **Explanation:** The clinical presentation of a **black necrotic mass** (eschar) in the nasal cavity of an **elderly diabetic patient** is a classic hallmark of **Rhinocerebral Mucormycosis**. **1. Why Mucormycosis is correct:** Mucormycosis is an opportunistic fungal infection caused by fungi of the order Mucorales. It predominantly affects patients with uncontrolled diabetes (especially those in ketoacidosis) or immunosuppression. The fungus is **angioinvasive**, meaning it invades blood vessel walls, leading to thrombosis and subsequent tissue infarction. This ischemia results in the characteristic **painless black eschar** on the turbinates, palate, or skin. **2. Why other options are incorrect:** * **Lupus vulgaris:** This is a progressive form of cutaneous tuberculosis. It typically presents with "apple-jelly" nodules on the face, not acute necrotic masses in the nose. * **Aspergillosis:** While it can cause fungal sinusitis, the invasive form is less common than Mucormycosis in diabetics and usually doesn't present with the rapid, hallmark black necrotic eschar. * **Pseudomonas infection:** This typically causes greenish-blue purulent discharge (e.g., in malignant otitis externa) rather than a dry, black necrotic mass. **Clinical Pearls for NEET-PG:** * **Diagnosis:** Confirmed by KOH mount or biopsy showing **broad, ribbon-like, non-septate hyphae** branching at **right angles (90°)**. * **Management:** This is a surgical emergency. Treatment involves aggressive surgical debridement and intravenous **Liposomal Amphotericin B**. * **Risk Factor:** Diabetic Ketoacidosis (DKA) is the strongest risk factor because the fungus thrives in acidic, glucose-rich environments.

Question 178: Strawberry skin appearance of the nasal mucosa is seen in which of the following conditions?

A. Wegener granulomatosis
B. Sarcoidosis
C. Kawasaki disease
D. Rhinosporidiosis (Correct Answer)

Explanation: **Explanation:** **Rhinosporidiosis** is a chronic granulomatous infection caused by *Rhinosporidium seeberi* (now classified as a Mesomycetozoan parasite). It typically presents as a friable, leafy, or polypoid mass in the nasal cavity. The characteristic **"strawberry skin appearance"** occurs because the surface of the reddish mass is studded with tiny white dots, which are actually **sporangia** (mature spores) visible through the thin epithelium. **Analysis of Incorrect Options:** * **Wegener Granulomatosis (Granulomatosis with Polyangiitis):** Characterized by "cobblestone" mucosa, crusting, and septal perforation. It does not show the white-dotted strawberry appearance. * **Sarcoidosis:** Typically presents with "lupus pernio" (violaceous skin lesions) or submucosal nodules described as "apple-jelly" spots on endoscopy. * **Kawasaki Disease:** While it features a "strawberry tongue," it does not typically involve the nasal mucosa in this specific morphological pattern. **NEET-PG High-Yield Pearls:** * **Etiology:** Associated with bathing in stagnant water (ponds/tanks). * **Common Site:** Nasal septum and turbinates. * **Histology:** Large, thick-walled **sporangia** containing thousands of **endospores** (diagnostic). * **Treatment of Choice:** Wide surgical excision with **cauterization of the base** to prevent recurrence. Medical therapy with **Dapsone** can be used as an adjunct to prevent recurrences by arresting spore maturation.

Question 179: What is the most common nasal mass?

A. Polyp (Correct Answer)
B. Papilloma
C. Angiofibroma
D. None of the above

Explanation: **Explanation:** **1. Why Polyp is the correct answer:** Nasal polyps are the most common non-neoplastic masses found in the nasal cavity [2]. They are non-cancerous, painless, grape-like outgrowths of the nasal or sinus mucosa, typically resulting from chronic inflammation (e.g., chronic rhinosinusitis, allergies, or asthma) [1]. They are categorized into two main types: **Ethmoidal polyps** (usually bilateral and multiple) and **Antrochoanal polyps** (usually unilateral and solitary) [1], [3]. Due to the high prevalence of chronic rhinosinusitis in the general population, polyps far outnumber neoplastic growths [2]. **2. Why the other options are incorrect:** * **B. Papilloma:** Specifically the Inverted Papilloma, this is a benign but locally aggressive epithelial tumor. While it is a common benign *neoplasm* of the nose, its incidence is significantly lower than that of inflammatory polyps [3]. * **C. Angiofibroma:** Juvenile Nasopharyngeal Angiofibroma (JNA) is a rare, benign but vascularly aggressive tumor found almost exclusively in adolescent males. It originates in the sphenopalatine foramen, not the nasal mucosa itself. **3. Clinical Pearls for NEET-PG:** * **Ethmoidal Polyps:** Most common type; associated with **Samter’s Triad** (Aspirin sensitivity, Asthma, and Nasal Polyposis). * **Antrochoanal Polyp:** Arises from the maxillary sinus mucosa; presents as a unilateral mass in children/young adults [3]. * **Management:** Medical management (steroids) is the first line for ethmoidal polyps, whereas **FESS (Functional Endoscopic Sinus Surgery)** is the treatment of choice for symptomatic or recurrent cases [4]. * **Rule of Thumb:** Any unilateral nasal mass in an elderly patient should be biopsied to rule out malignancy, but a simple polyp remains the most frequent finding overall [1], [4].

Question 180: All of the following are associated with decreased sense of smell EXCEPT?

A. Head trauma
B. Influenza B (Correct Answer)
C. Parkinsonism
D. Tobacco smoking

Explanation: **Explanation:** The sense of smell (olfaction) can be impaired by obstructive causes, sensorineural damage to the olfactory epithelium, or central nervous system pathology. **Why Influenza B is the correct answer:** While many viral infections cause **Post-Viral Olfactory Dysfunction (PVOD)**, **Influenza A** is a classic and frequent cause of permanent or prolonged anosmia due to direct neuroepithelial damage. In contrast, **Influenza B** is clinically associated with much milder respiratory symptoms and is rarely, if ever, implicated in significant or lasting olfactory loss. In the context of standard ENT textbooks and competitive exams, Influenza A is the recognized culprit for viral anosmia, making Influenza B the "exception." **Analysis of Incorrect Options:** * **Head Trauma:** This is a leading cause of anosmia. Shearing forces during trauma can tear the delicate **olfactory nerve filaments** as they pass through the **cribriform plate**. * **Parkinsonism:** Hyposmia is one of the earliest **prodromal symptoms** of Parkinson’s disease (often appearing years before motor symptoms) due to the deposition of Lewy bodies in the olfactory bulb. * **Tobacco Smoking:** Chronic smoking causes tobacco-induced mucosal changes and chemical damage to the olfactory receptors, leading to a dose-dependent decrease in olfactory sensitivity. **High-Yield Clinical Pearls for NEET-PG:** * **Kallmann Syndrome:** Hypogonadotropic hypogonadism associated with congenital anosmia (due to failure of olfactory bulb development). * **Foster Kennedy Syndrome:** Anosmia (ipsilateral) + Optic atrophy (ipsilateral) + Papilledema (contralateral); seen in olfactory groove meningiomas. * **Esthesioneuroblastoma:** A rare malignant tumor arising from the olfactory epithelium. * **Most common cause of temporary anosmia:** Common cold (nasal mucosal edema).

Practice by Chapter

Rhinitis

Practice Questions

Acute Rhinosinusitis

Practice Questions

Chronic Rhinosinusitis

Practice Questions

Nasal Polyposis

Practice Questions

Allergic Fungal Sinusitis

Practice Questions

Deviated Nasal Septum

Practice Questions

Epistaxis

Practice Questions

Nasal Trauma

Practice Questions

Choanal Atresia

Practice Questions

CSF Rhinorrhea

Practice Questions

Tumors of the Nose and Paranasal Sinuses

Practice Questions

Complications of Sinusitis

Practice Questions

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