Diseases of the Nose and Paranasal Sinuses Practice Questions

Q: A patient with sinus infection develops bilateral proptosis, chemosis, and fever. What is the most likely diagnosis?

Cavernous sinus thrombosis. ### Explanation **Correct Answer: C. Cavernous Sinus Thrombosis (CST)** The clinical triad of **sinus infection**, **bilateral proptosis**, and **chemosis** (conjunctival edema) is a classic presentation of Cavernous Sinus Thrombosis. * **Pathophysiology:** Infections from the "danger area of the face," ethmoid, or sphenoid sinuses spread via the valveless ophthalmic veins to the cavernous sinus. * **Why Bilateral?** The two cavernous sinuses communicate via the intercavernous plexuses. Therefore, symptoms that begin unilaterally rapidly become **bilateral**—a hallmark sign that distinguishes CST from simple orbital cellulitis. * **Clinical Features:** Patients present with high-grade fever, ophthalmoplegia (palsy of CN III, IV, VI), and decreased sensation in the ophthalmic division of the trigeminal nerve (CN V1). **Why Incorrect Options are Wrong:** * **A. Lateral Sinus Thrombosis:** Typically a complication of **chronic suppurative otitis media (CSOM)**. It presents with "Griesinger’s sign" (edema over the mastoid) and hectic fever, but not proptosis. * **B. Frontal Lobe Abscess:** A complication of frontal sinusitis. It presents with features of raised intracranial pressure (headache, vomiting, papilledema) and personality changes, but lacks ocular signs like proptosis. * **D. Meningitis:** While it causes fever and neck stiffness, it does not cause proptosis or chemosis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of CST:** *Staphylococcus aureus*. * **First sign of CST:** Often a palsy of the **Abducens nerve (CN VI)** because it runs centrally through the sinus. * **Investigation of Choice:** Contrast-enhanced MRI (MR Venogram). * **Differential Diagnosis:** Orbital Cellulitis (usually remains unilateral and lacks the profound systemic toxicity of CST).

Q: All of the following are true about antrochoanal polyp, except:

Premalignant. **Explanation:** Antrochoanal polyps (Killian’s polyp) are benign, non-neoplastic growths. The correct answer is **C** because these polyps have **no malignant potential** and are not considered premalignant conditions. **Analysis of Options:** * **Option A (Single):** True. Unlike ethmoidal polyps which are multiple, an antrochoanal polyp is typically a single mass that grows from the maxillary sinus into the choana. * **Option B (Unilateral):** True. They almost always present on one side. Bilateral presentation is extremely rare and should raise suspicion of other pathologies. * **Option D (Arises from maxillary antrum):** True. The polyp originates from the edematous mucosa of the maxillary sinus (antrum), usually near the accessory ostium. It then exits through the ostium into the nasal cavity and extends posteriorly toward the choana. **Clinical Pearls for NEET-PG:** * **Components:** It has three parts—Antral (cystic), Nasal (soft), and Choanal (bulbous). * **Demographics:** More common in children and young adults (Ethmoidal polyps are more common in adults). * **Etiology:** Usually associated with infection rather than allergy (unlike ethmoidal polyps). * **Radiology:** On X-ray/CT, it shows opacification of the maxillary sinus with a soft tissue mass extending into the nasopharynx. * **Treatment:** Functional Endoscopic Sinus Surgery (FESS) is the treatment of choice to remove the polyp and its antral attachment to prevent recurrence. Historically, the Caldwell-Luc operation was used.

Q: CSF rhinorrhea is most commonly seen in fracture of which bone?

Cribriform plate. **Explanation:** **1. Why Cribriform Plate is Correct:** CSF rhinorrhea occurs when there is a breach in the dura mater, arachnoid mater, and the underlying bony architecture of the skull base, creating a communication between the subarachnoid space and the nasal cavity. The **cribriform plate of the ethmoid bone** is the most common site for these leaks because it is the thinnest part of the anterior skull base and is intimately fused with the underlying dura. Even minor head trauma or iatrogenic injury (during FESS) can easily fracture this bone, leading to a CSF leak. **2. Why Other Options are Incorrect:** * **Temporal Bone:** Fractures here (especially longitudinal) more commonly lead to **CSF otorrhea**. While CSF can reach the nose via the Eustachian tube (paradoxical rhinorrhea), it is statistically less common than direct leaks from the anterior fossa. * **Nasal Bone:** These are the most common facial fractures, but they involve the external nasal framework and do not typically involve the dural lining or the cranial vault. * **Occipital Bone:** Fractures here involve the posterior fossa. While they can be fatal or cause cranial nerve palsies, they do not communicate with the nasal cavity. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Accidental trauma (80%), followed by iatrogenic causes. * **Diagnostic Gold Standard:** Detection of **Beta-2 Transferrin** in the fluid (highly specific for CSF). * **Imaging of choice:** High-resolution CT (HRCT) of the paranasal sinuses to locate the bony defect. * **Clinical Signs:** "Target sign" or "Halo sign" on a pillowcase; reservoir sign (gush of fluid on leaning forward). * **Management:** Most traumatic leaks settle with conservative management (bed rest, head elevation). If persistent, **endoscopic endonasal repair** is the treatment of choice.

Q: What are the common clinical manifestations of a rhinolith?

All of the above. A **rhinolith** is a calcareous concretion formed by the gradual deposition of mineral salts (calcium and magnesium phosphates/carbonates) around a central **nidus**. This nidus can be endogenous (e.g., dried blood, mucus, or a tooth) or exogenous (e.g., a forgotten foreign body, bead, or seed). ### **Explanation of Symptoms:** The correct answer is **D (All of the above)** because of the following pathophysiological mechanisms: * **Nasal Obstruction (A):** As the rhinolith grows over months or years, it physically occupies space in the nasal cavity, leading to progressive, typically **unilateral** nasal blockage. * **Foul-Smelling Discharge (B):** The stone acts as a chronic irritant to the nasal mucosa, leading to pressure necrosis, ulceration, and secondary bacterial infection. This results in a characteristic **unilateral, purulent, and malodorous (foul-smelling)** discharge, which may sometimes be blood-stained. * **Pain (C):** While often painless in the early stages, larger rhinoliths cause pressure on the surrounding sensory nerves of the nasal mucosa or lead to secondary sinusitis by obstructing the osteomeatal complex, resulting in localized pain or headache. ### **Clinical Pearls for NEET-PG:** * **Classic Presentation:** A patient presenting with **unilateral** nasal discharge and obstruction should always be evaluated for a rhinolith or a foreign body. * **Diagnosis:** On anterior rhinoscopy, it appears as a hard, greyish-black, irregular mass that "grates" on probing. * **Radiology:** They are **radio-opaque** on X-ray or CT scans. * **Differential Diagnosis:** Must be differentiated from osteoma, calcified polyps, or malignancy. * **Treatment:** Surgical removal, usually via an endoscopic approach. Large stones may require lithotripsy (crushing) before removal.

Q: Topical steroids are not recommended post-surgery for which of the following conditions?

Antrochoanal polyp. ### Explanation The correct answer is **Antrochoanal polyp (Option C)**. #### Why Antrochoanal Polyp is the Correct Answer Antrochoanal polyps (ACP) are typically **non-atopic** and **solitary** lesions that arise from the maxillary sinus mucosa, exit through the accessory ostium, and extend into the choana. Unlike other nasal polyps, ACPs are primarily a structural/mechanical issue rather than a manifestation of chronic mucosal inflammation or allergy. Once surgically removed (usually via FESS with wide antrostomy), they have a low recurrence rate, and there is no underlying diffuse mucosal disease to treat. Therefore, long-term topical steroids are unnecessary and provide no clinical benefit. #### Why the Other Options are Incorrect * **A. Allergic Fungal Sinusitis (AFS):** This is an IgE-mediated hypersensitivity to fungal antigens. Post-operative topical (and sometimes systemic) steroids are the mainstay of treatment to prevent the recurrence of "peanut butter" eosinophilic mucin. * **B. Chronic Rhinosinusitis (CRS):** Whether with or without polyps, CRS involves chronic inflammation of the sinonasal mucosa. Topical steroids are the "gold standard" post-operatively to reduce mucosal edema and maintain ostial patency. * **C. Ethmoidal Polyps:** These are usually bilateral, multiple, and strongly associated with allergy, asthma, and aspirin sensitivity (Samter’s Triad). They have a high recurrence rate; thus, lifelong topical steroids are often required post-surgery to suppress mucosal inflammation. #### NEET-PG High-Yield Pearls * **Origin of ACP:** Most commonly the posterior wall/floor of the Maxillary Sinus. * **Radiology:** On CT, ACP shows a "dumbbell-shaped" mass extending from the maxillary sinus to the nasopharynx. * **Killian’s Polyp:** Another name for the Antrochoanal polyp. * **Histology:** ACPs are characterized by fewer eosinophils compared to ethmoidal polyps, which are eosinophil-rich.

Q: Radiographic finding of an air column between a soft tissue mass and the posterior wall of the nasopharynx is suggestive of which of the following?

Antrochoanal polyp. **Explanation:** The radiographic finding described is known as the **"Air Column Sign"** or **"Patterson’s Sign."** It is a classic radiological feature of an **Antrochoanal Polyp (ACP)**. **1. Why Antrochoanal Polyp is correct:** An ACP originates from the maxillary sinus mucosa, exits through the accessory ostium, and extends through the choana into the nasopharynx. On a lateral X-ray of the skull/nasopharynx, the polyp appears as a smooth, soft-tissue mass. Because the polyp is pedunculated and hangs freely into the nasopharynx without being attached to its walls, a thin, translucent strip of air remains visible between the posterior border of the mass and the posterior pharyngeal wall. This distinguishes it from masses arising directly from the nasopharyngeal wall (like Angiofibroma), which would obliterate this space. **2. Why other options are incorrect:** * **Ethmoidal Polyp:** These are typically multiple, bilateral, and arise from the ethmoidal air cells. They rarely grow large enough to present as a solitary nasopharyngeal mass with a distinct air column sign. * **Nasal Myiasis:** This is a parasitic infestation (maggots) characterized by foul-smelling discharge and tissue destruction, not a discrete soft-tissue mass on imaging. **Clinical Pearls for NEET-PG:** * **Origin:** ACP most commonly arises from the **maxillary sinus** (specifically the lateral wall or floor). * **Triad of ACP:** Nasal mass, ostium exit, and choanal extension. * **Age:** More common in children and young adults; usually unilateral. * **Investigation of Choice:** CT scan of the Paranasal Sinuses (PNS) showing a "dumbbell-shaped" mass. * **Treatment:** Functional Endoscopic Sinus Surgery (FESS) is the gold standard.

Q: Which sinus infection most commonly leads to periorbital cellulitis?

Ethmoidal. **Explanation:** The **ethmoid sinus** is the most common source of periorbital and orbital cellulitis across all age groups, particularly in children. This is due to the unique anatomical relationship between the ethmoid air cells and the orbit. The two structures are separated only by the **lamina papyracea**, a paper-thin bone that contains numerous natural dehiscences and perforations for the ethmoidal vessels and nerves. These pathways allow for the direct spread of infection from the sinus into the orbital space. **Analysis of Options:** * **Maxillary Sinus (B):** While the roof of the maxillary sinus forms the floor of the orbit, it is thicker than the lamina papyracea. Maxillary sinusitis more commonly presents with dental pain or cheek swelling rather than primary orbital complications. * **Sphenoidal Sinus (C):** Infection here is rare but dangerous. It is more likely to lead to intracranial complications (like cavernous sinus thrombosis) or optic nerve involvement rather than simple periorbital cellulitis. * **Frontal Sinus (D):** Frontal sinusitis can cause orbital complications (often involving the superior-medial aspect), but it is less common because the frontal sinus does not finish developing until late childhood/adolescence. It is more frequently associated with **Pott’s Puffy Tumor** (osteomyelitis of the frontal bone). **Clinical Pearls for NEET-PG:** * **Chandler’s Classification:** Used to grade orbital complications of sinusitis (Stage I: Preseptal cellulitis; Stage II: Orbital cellulitis; Stage III: Subperiosteal abscess; Stage IV: Orbital abscess; Stage V: Cavernous sinus thrombosis). * **Most common complication of sinusitis:** Orbital complications (specifically from the ethmoid sinus). * **Proptosis and limited extraocular movements:** These are the key clinical signs that differentiate **Orbital Cellulitis** (Stage II) from **Preseptal Cellulitis** (Stage I).

Q: Inverted papilloma is characterized by all of the following except?

Seen more often in females. **Explanation:** Inverted Papilloma (also known as Ringertz tumor) is a benign but locally aggressive neoplasm of the nasal cavity. **1. Why Option B is the correct answer (The "Except"):** Inverted papilloma shows a strong **male predominance**, typically affecting men in the **40–60 year** age group with a ratio of approximately **3:1**. Therefore, the statement that it is seen more often in females is incorrect. **2. Analysis of other options:** * **Option A (Schneiderian Papilloma):** This is the correct synonymous term. The nasal cavity and paranasal sinuses are lined by Schneiderian membrane (ectodermal origin). There are three types of Schneiderian papillomas: Inverted (most common), Fungiform (exophytic), and Oncocytic. * **Option C (Epistaxis and Nasal Obstruction):** These are the classic presenting symptoms. Patients typically present with **unilateral** nasal obstruction, often accompanied by serosanguinous discharge or epistaxis. * **Option D (Lateral wall of the nose):** This is the most common site of origin, specifically the **middle meatus** or the ethmoid sinus. From here, it may secondarily involve the maxillary sinus. **Clinical Pearls for NEET-PG:** * **Histopathology:** Characterized by the inward proliferation of surface epithelium into the underlying stroma (hence "inverted") with an intact basement membrane. * **Malignant Potential:** It is associated with **Squamous Cell Carcinoma** in about 5–15% of cases. * **Recurrence:** It has a high recurrence rate, necessitating wide surgical excision (usually via **Endoscopic Sinus Surgery** or Medial Maxillectomy). * **Radiology:** On CT, it often shows a unilateral soft tissue mass with focal bony destruction or hyperostosis at the site of origin.

Q: Recurrent epistaxis is not a common feature of which of the following conditions?

Nasal polyps. **Explanation:** The correct answer is **Nasal polyps**. **1. Why Nasal Polyps is the correct answer:** Nasal polyps (specifically ethmoidal polyps) are non-neoplastic, edematous hypertrophies of the sinus mucosa. They are characterized by being **painless, pearly white, and remarkably avascular**. Because they lack a significant blood supply and are not prone to surface ulceration, they typically present with nasal obstruction and anosmia rather than bleeding. If a "polypoid" mass bleeds on touch, a clinician should immediately suspect a more vascular pathology like an inverted papilloma or malignancy. **2. Why the other options are incorrect:** * **Deviated Nasal Septum (DNS):** A sharp bony spur in DNS can stretch the overlying mucosa, making it thin and prone to drying. This leads to crusting and subsequent bleeding when the crusts detach (often from the convex side). * **Atrophic Rhinitis:** This condition involves progressive atrophy of the nasal mucosa and turbinates. The characteristic foul-smelling "blackish-green" crusts are firmly adherent; when they are dislodged, they leave behind a raw, bleeding surface. * **Maxillary Carcinoma:** Malignancy is characterized by neoangiogenesis and tissue necrosis. A friable, ulcerated mass in the maxillary sinus frequently presents with blood-stained nasal discharge or frank epistaxis. **Clinical Pearls for NEET-PG:** * **Ethmoidal Polyps:** Usually bilateral, associated with allergy/asthma (Samter’s Triad), and **rarely bleed**. * **Antrochoanal Polyps:** Usually unilateral, arise from the maxillary sinus, and also do not typically cause epistaxis. * **Bleeding Polypus of Septum:** Despite the name, this is actually a **capillary hemangioma** (not a true polyp) and is a notorious cause of epistaxis. * **Rule of Thumb:** Any unilateral, friable nasal mass that bleeds on touch in an elderly patient must be considered **Malignancy** until proven otherwise.

Question 1

A patient with sinus infection develops bilateral proptosis, chemosis, and fever. What is the most likely diagnosis?

Accepted Answer

Cavernous sinus thrombosis

Answer

Lateral sinus thrombosis

Answer

Frontal lobe abscess

Answer

Meningitis

Question 2

All of the following are true about antrochoanal polyp, except:

Accepted Answer

Premalignant

Answer

Single

Answer

Unilateral

Answer

Arises from maxillary antrum

Question 3

CSF rhinorrhea is most commonly seen in fracture of which bone?

Accepted Answer

Cribriform plate

Answer

Temporal bone

Answer

Nasal bone

Answer

Occipital bone

Question 4

What are the common clinical manifestations of a rhinolith?

Accepted Answer

All of the above

Answer

Nasal obstruction

Answer

Foul smelling discharge

Answer

Pain

Question 5

Topical steroids are not recommended post-surgery for which of the following conditions?

Accepted Answer

Antrochoanal polyp

Answer

Allergic fungal sinusitis

Answer

Chronic rhinosinusitis

Answer

Ethmoidal polyps

Question 6

Radiographic finding of an air column between a soft tissue mass and the posterior wall of the nasopharynx is suggestive of which of the following?

Accepted Answer

Antrochoanal polyp

Answer

Ethmoidal polyp

Answer

Nasal myiasis

Answer

None of the above

Question 7

Which sinus infection most commonly leads to periorbital cellulitis?

Accepted Answer

Ethmoidal

Answer

Maxillary

Answer

Sphenoidal

Answer

Frontal

Question 8

Inverted papilloma is characterized by all of the following except?

Accepted Answer

Seen more often in females

Answer

Also called as schneiderian papilloma

Answer

Presents with epistaxis and nasal obstruction

Answer

Originates from the lateral wall of the nose

Question 9

A 32-year-old male presents with swelling in the left maxillary region and a feeling of heaviness in the maxillary sinus one week after extraction of the maxillary first molar via a transalveolar approach. Considering the symptoms, how do mucolytics aid in managing this condition?

Accepted Answer

All of the above

Answer

Reducing mucus stasis

Answer

Reducing the growth of gram-negative bacteria

Answer

Promoting aeration in the maxillary sinus

Question 10

Recurrent epistaxis is not a common feature of which of the following conditions?

Accepted Answer

Nasal polyps

Answer

Deviated Nasal Septum (DNS)

Answer

Atrophic rhinitis

Answer

Maxillary carcinoma

Diseases of the Nose and Paranasal Sinuses — MCQs

Diseases of the Nose and Paranasal Sinuses — MCQs

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