Diseases of the Nose and Paranasal Sinuses — MCQs

A 32-year-old male patient presents with swelling in the left maxillary region and a feeling of heaviness in the maxillary sinus, following the extraction of his maxillary first molar one week prior. The extraction was performed via the transalveolar approach. What is the most common microbial population found in an infected maxillary sinus?

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

Question 31: Ground glass appearance of the maxillary sinus is typically seen in which of the following conditions?

A. Maxillary Sinusitis
B. Maxillary Carcinoma
C. Maxillary polyp
D. Maxillary fibrous dysplasia (Correct Answer)

Explanation: **Explanation:** **Fibrous dysplasia** is a benign bone disorder where normal bone marrow is replaced by fibro-osseous tissue. In the head and neck, it most commonly involves the maxilla. The hallmark radiological feature of fibrous dysplasia is a **"Ground Glass Appearance"** (smoky or cloudy appearance). This occurs because the disorganized arrangement of thin, poorly mineralized bone trabeculae creates a uniform, semi-opaque density on X-ray or CT scans. **Analysis of Incorrect Options:** * **Maxillary Sinusitis:** Typically presents as generalized opacification of the sinus or an air-fluid level. It does not show the characteristic bony trabecular pattern of ground glass. * **Maxillary Carcinoma:** Usually presents as an irregular soft tissue mass with evidence of **aggressive bony destruction** and infiltration into surrounding structures, rather than a uniform ground-glass density. * **Maxillary Polyp:** Appears as a smooth, soft tissue density within the sinus cavity. While it may cause expansion of the sinus walls due to pressure, it does not involve the internal bony remodeling seen in fibrous dysplasia. **High-Yield Clinical Pearls for NEET-PG:** * **Radiological Sign:** Ground glass appearance is the "buzzword" for Fibrous Dysplasia. * **Monostotic vs. Polyostotic:** Monostotic (single bone) is more common in the craniofacial region. * **McCune-Albright Syndrome:** Triad of polyostotic fibrous dysplasia, café-au-lait spots (Coast of Maine borders), and precocious puberty. * **Management:** Usually conservative (observation) unless there is functional impairment or significant deformity, in which case surgical "shaving" or contouring is preferred over radical excision.

Question 32: Saddle nose is defined as which of the following?

A. A depressed nasal bridge (Correct Answer)
B. A crooked nasal appearance
C. A deviated nasal septum
D. A C-shaped nasal deformity

Explanation: **Explanation:** **Saddle nose deformity** is characterized by a **depression of the nasal bridge** (the dorsum of the nose) due to the loss of cartilaginous or bony support. This typically occurs because of the destruction of the nasal septum, which acts as the primary "strut" for the nasal profile. * **Why Option A is correct:** The term "saddle" refers to the concave appearance of the nasal dorsum, resembling a horse's saddle. This is most commonly caused by conditions that lead to septal necrosis, such as **nasal trauma**, over-resection during septoplasty, or infections like **syphilis** (congenital or tertiary) and **leprosy**. Autoimmune conditions like **Granulomatosis with Polyangiitis (Wegener's)** are also high-yield causes. * **Why other options are incorrect:** * **Option B (Crooked nose):** Refers to a nose where the midline of the bridge is displaced to one side or is S-shaped, usually due to trauma involving both bone and cartilage. * **Option C (Deviated nasal septum):** This is an internal structural abnormality where the septum is shifted away from the midline, causing airway obstruction, rather than a depression of the external bridge. * **Option D (C-shaped deformity):** This describes a specific type of external deviation where the nose curves to one side in a continuous arc, often seen in nasal bone fractures. **Clinical Pearls for NEET-PG:** * **Most common cause:** Trauma (accidental or surgical). * **Classic Infectious Cause:** Congenital Syphilis (associated with Hutchinson’s teeth and interstitial keratitis). * **Treatment:** Augmentation rhinoplasty using fillers (for minor defects) or **autologous grafts** (rib cartilage, iliac crest bone) for significant depressions. * **Differential Diagnosis:** Do not confuse with "Snuffling" (neonatal syphilis) or "Hump nose" (excessive dorsal height).

Question 33: An IDDM patient presents with septal perforation of the nose with brownish-black discharge. What is the probable diagnosis?

A. Rhinosporidiosis
B. Aspergillus
C. Leprosy
D. Mucormycosis (Correct Answer)

Explanation: **Explanation:** The clinical presentation of a patient with **Insulin-Dependent Diabetes Mellitus (IDDM)** presenting with **septal perforation** and **brownish-black nasal discharge** is a classic "spotter" for **Mucormycosis** (Rhinocerebral Mucormycosis). **Why Mucormycosis is correct:** Mucormycosis is an opportunistic fungal infection caused by fungi of the order Mucorales. It primarily affects immunocompromised individuals, especially those with **diabetic ketoacidosis (DKA)**. The hallmark of this fungus is **angioinvasion**, leading to thrombosis and subsequent **ischemic necrosis** of tissues. This necrosis manifests clinically as a characteristic **black eschar** or brownish-black discharge on the turbinates or septum, eventually leading to bone destruction and septal perforation. **Why other options are incorrect:** * **Rhinosporidiosis:** Caused by *Rhinosporidium seeberi*, it typically presents as a leafy, friable, strawberry-like vascular polyp. It is associated with bathing in stagnant water, not diabetes. * **Aspergillus:** While it can cause invasive fungal sinusitis, it is less commonly associated with the rapid, fulminant necrotic destruction and black eschar seen in Mucormycosis in a diabetic context. * **Leprosy:** Causes atrophic rhinitis and painless septal perforation (usually in the cartilaginous part), but it does not present with acute brownish-black necrotic discharge. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factor:** Uncontrolled Diabetes (DKA) is the most common predisposing factor. * **Diagnosis:** KOH mount/Biopsy shows **broad, ribbon-like, non-septate hyphae** branching at **right angles (90°)**. * **Treatment:** Medical emergency requiring aggressive surgical debridement and intravenous **Liposomal Amphotericin B**. * **Triad:** Ophthalmoplegia, facial swelling, and black nasal eschar.

Question 34: The lamina papyracea is anatomically situated between which structures?

A. Optic nerve and orbit
B. Maxillary sinus and orbit
C. Ethmoid sinus and orbit (Correct Answer)
D. Cranial cavity and orbit

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The **lamina papyracea** (also known as the orbital plate of the ethmoid bone) is a paper-thin, smooth bone that forms the **lateral wall of the ethmoid sinus** and the **medial wall of the orbit**. Anatomically, it serves as the delicate partition separating these two structures. Its extreme thinness makes it the most common site for the spread of infection from the ethmoid air cells into the orbit, leading to orbital cellulitis. **2. Why the Incorrect Options are Wrong:** * **Option A (Optic nerve and orbit):** The optic nerve is located within the orbit (posteriorly) and enters via the optic canal. The lamina papyracea is a bony wall, not a divider between a nerve and its cavity. * **Option B (Maxillary sinus and orbit):** The structure separating the maxillary sinus from the orbit is the **orbital floor** (maxillary bone), which is the site of "blow-out" fractures. * **Option C (Cranial cavity and orbit):** The **roof of the orbit** (frontal bone) and the **cribriform plate** (ethmoid bone) separate the orbit and nasal cavity from the anterior cranial fossa. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Orbital Cellulitis:** The lamina papyracea is the most common route for the spread of ethmoiditis into the orbit (Chandler’s Classification). * **FESS Landmark:** During Functional Endoscopic Sinus Surgery (FESS), accidental penetration of the lamina papyracea can lead to orbital hematoma or injury to the medial rectus muscle. * **Haller Cells:** These are infraorbital ethmoid air cells that grow into the floor of the orbit/roof of the maxillary sinus. * **Thickness:** It is one of the thinnest bones in the human body, hence the name "papyracea" (Latin for paper-like).

Question 35: An 85-year-old hypertensive man is evaluated in the emergency department for recent onset epistaxis. His blood pressure is 150/80 mm Hg, and hematocrit is 39%. What is the most likely source of bleeding?

A. Posterior nasal septum (Correct Answer)
B. Anterior nasal septum
C. Inferior turbinate
D. Middle turbinate

Explanation: **Explanation:** The correct answer is **Posterior nasal septum**. In elderly patients, especially those with comorbidities like hypertension or atherosclerosis, epistaxis often originates from the **posterior part of the nasal cavity**. The specific site is usually the posterior part of the nasal septum or the lateral wall, supplied by the **Sphenopalatine artery** (a branch of the maxillary artery). This area is known as **Woodruff’s Plexus**, located over the posterior end of the middle turbinate on the lateral wall and the corresponding septal area. Unlike anterior bleeds, posterior epistaxis is more profuse, often flows into the pharynx, and usually requires packing or endoscopic cauterization. **Why other options are incorrect:** * **Anterior nasal septum:** This is the site of **Little’s Area (Kiesselbach’s Plexus)**. While it is the most common site for epistaxis in children and young adults (90% of cases), it is less likely to be the primary source in an elderly, hypertensive patient presenting with a significant recent-onset bleed. * **Inferior/Middle turbinate:** While these structures are highly vascular, they are rarely the primary source of spontaneous epistaxis compared to the septal plexuses. **NEET-PG High-Yield Pearls:** * **Little’s Area (Anterior):** Formed by the anastomosis of the Sphenopalatine, Greater palatine, Superior labial, and Anterior ethmoidal arteries. * **Woodruff’s Plexus (Posterior):** Formed by the Sphenopalatine, Ascending pharyngeal, and Posterior nasal arteries. * **Management:** Anterior bleeds are managed with chemical cautery (Silver nitrate) or anterior packing; posterior bleeds often require **Post-nasal packing** or **Sphenopalatine Artery Ligation (SPAL)**. * **Trotter’s Method:** The first-aid maneuver for epistaxis (sitting up and pinching the nose).

Question 36: Which of the following is true about an antrochoanal polyp?

A. Common in adults
B. Usually singular (Correct Answer)
C. Usually bilateral
D. Associated with allergy

Explanation: **Explanation:** **Antrochoanal (AC) Polyps** (also known as Killian’s polyp) are benign growths that arise from the mucosa of the maxillary antrum, exit through the natural or accessory ostium, and extend into the choana and nasopharynx. * **Why Option B is Correct:** AC polyps are **characteristically solitary and unilateral**. Unlike ethmoidal polyps, which grow in clusters, an AC polyp consists of a single mass with three parts: antral, nasal, and choanal. * **Why Options A & C are Incorrect:** AC polyps are primarily seen in **children and young adults**, whereas ethmoidal polyps are more common in older adults. Because they arise from a single maxillary sinus, they are almost always **unilateral**. Bilateral presentation is extremely rare and should prompt a search for alternative diagnoses. * **Why Option D is Incorrect:** The etiology of AC polyps is generally attributed to **chronic infection** (sinusitis) rather than allergy. In contrast, ethmoidal polyps are strongly associated with Type 1 hypersensitivity (allergy), asthma, and aspirin sensitivity. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** On CT scan, they appear as a homogenous mass filling the maxillary sinus and extending into the nasopharynx through an enlarged ostium. * **Clinical Feature:** They cause **expiratory** nasal obstruction (the polyp acts as a ball-valve, moving into the choana during expiration). * **Treatment of Choice:** Functional Endoscopic Sinus Surgery (FESS) to remove the polyp and its base to prevent recurrence. * **Differential Diagnosis:** In a young male with a nasopharyngeal mass, always rule out Juvenile Nasopharyngeal Angiofibroma (JNA).

Question 37: Overfilling of dental materials may force them directly into the maxillary sinus. In which of the following cases is this most frequent?

A. Maxillary second premolar
B. Maxillary first premolar
C. Maxillary first molar (Correct Answer)
D. Facial root of maxillary first premolar

Explanation: **Explanation:** The relationship between the maxillary sinus (Antrum of Highmore) and the maxillary teeth is clinically significant because the floor of the sinus is formed by the alveolar process of the maxilla. **Why Maxillary First Molar is Correct:** The **maxillary first molar** is the tooth most frequently associated with the maxillary sinus. Its roots are in closest proximity to the sinus floor, often separated only by a thin layer of bone or even just the mucous membrane (Schneiderian membrane). Due to this anatomical intimacy, dental procedures such as root canal treatments, extractions, or implant placements carry a higher risk of displacing dental materials or root fragments into the sinus cavity. **Analysis of Incorrect Options:** * **Maxillary Second Premolar (A):** While the second premolar is frequently related to the sinus, it is statistically less common than the first molar. * **Maxillary First Premolar (B):** The first premolar is located more anteriorly; its relationship with the sinus floor is less consistent compared to the molars. * **Facial root of maxillary first premolar (D):** This is a specific anatomical part of a tooth that is generally further from the main body of the antrum compared to the palatal or buccal roots of the first molar. **Clinical Pearls for NEET-PG:** * **Order of Proximity:** The proximity to the maxillary sinus follows the order: **1st Molar > 2nd Molar > 2nd Premolar.** * **Oro-Antral Fistula (OAF):** The most common cause of OAF is the extraction of the maxillary first molar. * **Referred Pain:** Maxillary sinusitis often presents as "dental pain" because the superior alveolar nerves supply both the sinus lining and the maxillary teeth. * **Hansen’s Disease:** Note that the anterior nasal spine is destroyed in Leprosy, but the maxillary sinus remains a key landmark in dental-related ENT pathologies.

Question 38: All are true about maxillary sinusitis except?

A. Pain over the upper jaw
B. No variation of pain with jaw movement (Correct Answer)
C. Most common sinusitis in adults
D. Maxillary sinus present at birth

Explanation: In **Acute Maxillary Sinusitis**, the pain is typically localized over the malar region (upper jaw) and may radiate to the teeth or forehead. A characteristic clinical feature of maxillary sinusitis is that the **pain is aggravated by movements of the jaw**, such as chewing or talking, and by bending forward. This occurs because the roots of the upper molar and premolar teeth are in close proximity to the floor of the maxillary sinus. Therefore, the statement that there is "no variation of pain with jaw movement" is **incorrect**, making it the right choice for this "except" question. **Analysis of other options:** * **Option A:** Pain over the upper jaw is the hallmark symptom due to the location of the sinus and the distribution of the infraorbital nerve. * **Option C:** The maxillary sinus is the **most common** sinus to be involved in both acute and chronic infections in adults, followed by the ethmoid, frontal, and sphenoid sinuses. * **Option D:** The maxillary and ethmoid sinuses are **present at birth** (though small). The frontal sinus appears at age 2 and is radiologically visible by age 6, while the sphenoid sinus appears around age 3. **Clinical Pearls for NEET-PG:** * **Pritchard’s Sign:** Tenderness over the anterior wall of the maxillary sinus. * **Postural Variation:** Maxillary sinus pain often worsens in the evening (as the sinus fills up during the day). * **Drainage:** The maxillary sinus drains into the **middle meatus** via the hiatus semilunaris. Its drainage is anatomically disadvantaged because the ostium is located high on its medial wall.

Question 39: Mikulicz cells are characteristically seen in which condition?

A. Rhinosporidiosis
B. Rhinoscleroma (Correct Answer)
C. Otomycosis
D. Ozaena

Explanation: **Explanation:** **Rhinoscleroma** is a chronic granulomatous disease caused by **Klebsiella rhinoscleromatis** (Frisch bacillus). The hallmark histological feature of this condition is the **Mikulicz cell**. These are large, pale, foamy macrophages with a vacuolated cytoplasm that contain the causative Gram-negative bacilli. Their presence, along with **Russell bodies** (eosinophilic inclusion bodies representing degenerated plasma cells), is pathognomonic for the proliferative stage of Rhinoscleroma. **Analysis of Incorrect Options:** * **Rhinosporidiosis:** Caused by *Rhinosporidium seeberi*. Histology characteristically shows large **sporangia** containing numerous endospores, not Mikulicz cells. * **Otomycosis:** A fungal infection of the external auditory canal (commonly *Aspergillus* or *Candida*). It presents with fungal hyphae and spores, not granulomatous foam cells. * **Ozaena (Atrophic Rhinitis):** Characterized by atrophy of the nasal mucosa and turbinates with foul-smelling crusts. While it involves squamous metaplasia, it does not feature Mikulicz cells. **High-Yield Clinical Pearls for NEET-PG:** * **Stages of Rhinoscleroma:** 1. Atrophic stage (mimics Ozaena), 2. Proliferative/Granulomatous stage (Mikulicz cells found here), 3. Cicatricial stage (leads to stenosis). * **Site of Origin:** Usually starts in the **subepithelial layer of the nose**, specifically the anterior nares or nasopharynx. * **Treatment:** Long-term antibiotics (Streptomycin and Tetracycline are traditional; Ciprofloxacin is also effective). * **Biopsy Findings:** Remember the "M & R" rule: **M**ikulicz cells and **R**ussell bodies.

Question 40: A 32-year-old male patient presents with swelling in the left maxillary region and a feeling of heaviness in the maxillary sinus, following the extraction of his maxillary first molar one week prior. The extraction was performed via the transalveolar approach. What is the most common microbial population found in an infected maxillary sinus?

A. Polymicrobial with anaerobic organisms (Correct Answer)
B. Aerobic organisms
C. Fungal
D. Viral

Explanation: ### Explanation **Correct Answer: A. Polymicrobial with anaerobic organisms** The clinical presentation describes **Odontogenic Sinusitis (ODS)**. The maxillary sinus floor is in close anatomical proximity to the roots of the maxillary premolars and molars (especially the first and second molars). Dental procedures, such as a transalveolar extraction, can create an **oroantral communication (OAC)** or introduce dental pathogens directly into the sinus. Unlike primary rhinogenic sinusitis (which is usually aerobic), odontogenic sinusitis is typically **polymicrobial**, reflecting the flora of the oral cavity and periodontal disease. The predominant organisms are **anaerobes** (e.g., *Peptostreptococcus*, *Fusobacterium*, and *Prevotella* species), often co-existing with aerobic bacteria like *Streptococcus viridans* or *Staphylococcus aureus*. **Analysis of Incorrect Options:** * **B. Aerobic organisms:** While aerobes can be present, they are rarely the sole or dominant population in odontogenic infections. Aerobes like *S. pneumoniae* and *H. influenzae* are more characteristic of community-acquired acute rhinosinusitis. * **C. Fungal:** Fungal sinusitis (e.g., Mycetoma or Allergic Fungal Rhinosinusitis) usually presents chronically or in immunocompromised states. While "Aspergillosis" can occur in the maxillary sinus, it is not the most common finding following a dental extraction. * **D. Viral:** Viral infections are the leading cause of *acute rhinosinusitis* (common cold), but they do not correlate with post-extraction complications or localized dental-related heaviness. **Clinical Pearls for NEET-PG:** * **Anatomy:** The **maxillary first molar** is the tooth most commonly associated with odontogenic sinusitis. * **Diagnosis:** A foul-smelling (cacosmia) unilateral nasal discharge is a classic hallmark of anaerobic/odontogenic sinusitis. * **Radiology:** Look for "periapical lucency" or "mucosal thickening" localized to the floor of the maxillary sinus on a CT scan or OPG. * **Management:** Treatment requires both antibiotics (covering anaerobes, e.g., Amoxicillin-Clavulanate or Metronidazole) and addressing the dental source (closure of OAC or root canal treatment).

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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