Diseases of the Nose and Paranasal Sinuses Practice Questions

Q: A 26-year-old man has had difficulty breathing through his nose for 3 years, with progressive worsening over the past 2 months. Physical examination reveals glistening, translucent, polypoid masses filling the nasal cavities. Histologic examination of excised masses shows respiratory mucosa overlying an edematous stroma with scattered plasma cells and eosinophils. Which of the following laboratory findings is most likely to be present in this patient?

Increased serum IgE level. ### Explanation The clinical presentation of bilateral, glistening, translucent masses in the nasal cavity is characteristic of **Ethmoidal Nasal Polyps**. These are non-neoplastic inflammatory outgrowths of the sinonasal mucosa. **1. Why Option B is Correct:** Ethmoidal polyps are strongly associated with **Type I hypersensitivity (allergic) reactions**, chronic inflammation, and asthma. The histological description—edematous stroma with **eosinophils and plasma cells**—is a classic hallmark of allergic polyps. In such patients, an **increased serum IgE level** and peripheral blood eosinophilia are common laboratory findings, reflecting the underlying allergic diathesis. **2. Why the Other Options are Incorrect:** * **Option A (HbA1c):** Elevated HbA1c indicates Diabetes Mellitus. While diabetics are prone to fungal sinusitis (like Mucormycosis), diabetes is not a primary risk factor for simple nasal polyposis. * **Option C (EBV):** Nuclear staining for EBV is associated with **Nasopharyngeal Carcinoma**, which typically presents as a solid mass in the fossa of Rosenmüller, often with neck nodes, rather than translucent nasal polyps. * **Option D (ANA):** A positive ANA test suggests systemic autoimmune diseases (like SLE). While Wegener’s Granulomatosis (GPA) involves the nose, it presents with crusting and granulomatous inflammation, not simple polyps, and is associated with c-ANCA, not ANA. **Clinical Pearls for NEET-PG:** * **Sampster’s Triad:** Nasal polyps + Aspirin sensitivity + Asthma. * **Unilateral Polyp:** Always rule out **Antrochoanal polyp** (originates from the maxillary sinus) or malignancy (Inverted Papilloma). * **Kartagener’s Syndrome:** Triad of Situs inversus, Bronchiectasis, and Sinusitis (often with polyps). * **Treatment of Choice:** Medical management starts with **topical steroids**; surgical management is Functional Endoscopic Sinus Surgery (FESS).

Q: The most common mucocele of the paranasal sinuses involving the orbit arises from which sinus?

Frontal sinus. ### Explanation **1. Why Frontal Sinus is Correct:** A mucocele is a chronic, expanding, cyst-like lesion filled with mucus, caused by the obstruction of a sinus ostium. The **frontal sinus** is the most common site for mucocele formation (accounting for approximately 60–65% of cases). Because the floor of the frontal sinus is thin and forms the superomedial roof of the orbit, expansion typically occurs downward and outward. This leads to the classic clinical presentation of **proptosis with inferolateral displacement** of the globe. **2. Analysis of Incorrect Options:** * **Ethmoidal Sinus (Option B):** This is the second most common site (approx. 20–25%). Ethmoidal mucoceles typically cause lateral displacement of the globe. In children, however, the ethmoid sinus is a more frequent site of involvement than in adults. * **Maxillary Sinus (Option C):** These are relatively rare. When they occur, they expand upward, causing superior displacement of the globe (enophthalmos or upward proptosis). * **Sphenoidal Sinus (Option D):** These are the least common. They are clinically significant because they can compress the optic nerve at the apex, leading to early visual loss or cranial nerve palsies (III, IV, VI) without significant globe displacement. **3. Clinical Pearls for NEET-PG:** * **Most common cause of proptosis in adults:** Thyroid Eye Disease (TED). * **Most common cause of unilateral proptosis in children:** Orbital Cellulitis. * **Radiology:** On CT scan, a mucocele appears as a non-enhancing, homogenous, airless, expanded sinus with thinning of the bony walls. * **Treatment:** Surgical drainage (usually endoscopic sinus surgery) is the definitive management.

Q: A patient presents with an antrochoanal polyp arising from the medial wall of the maxilla. Which of the following would be the best management for the patient?

FESS with polypectomy. **Explanation:** **1. Why FESS with Polypectomy is the Correct Choice:** Functional Endoscopic Sinus Surgery (FESS) is currently the **gold standard** for treating antrochoanal polyps (ACP). An ACP typically originates from the maxillary sinus (most commonly the medial wall or posterior wall) and extends through the accessory ostium into the choana. FESS allows for the precise identification of the polyp’s pedicle, wide clearance of the maxillary ostium (middle meatal antrostomy), and complete removal of the cystic intramaxillary component. This approach minimizes recurrence while preserving the sinus physiology and avoiding external scars. **2. Analysis of Incorrect Options:** * **Medial Maxillectomy (TEMM):** This is an overly aggressive procedure reserved for benign or malignant tumors (e.g., Inverted Papilloma). It is not indicated for a simple inflammatory polyp. * **Caldwell-Luc Procedure:** Historically used to ensure complete removal of the antral base, it is now largely obsolete for ACPs due to risks of infraorbital nerve injury, cheek swelling, and dental damage. It is only considered in rare, recurrent cases where the pedicle is inaccessible via FESS. * **Intranasal Polypectomy:** This involves simple snare removal of the nasal part of the polyp. It almost always leads to **recurrence** because the intramaxillary "root" or stalk is left behind. **3. Clinical Pearls for NEET-PG:** * **Origin:** ACPs most commonly arise from the **medial wall** or the floor of the maxillary sinus. * **Radiology:** On CT, they show a "dumbbell-shaped" mass extending from the antrum to the choana. * **Killian’s Polyp:** Another name for the Antrochoanal Polyp. * **Key Distinction:** Unlike ethmoidal polyps (which are bilateral and multiple), ACPs are typically **unilateral and solitary**.

Q: Which of the following techniques can be used only in an edentulous maxilla to treat oro-antral fistula?

Bridge Flap. **Explanation:** An **Oro-antral fistula (OAF)** is an epithelialized communication between the oral cavity and the maxillary sinus, most commonly occurring after the extraction of maxillary premolars or molars. **Why Bridge Flap is the Correct Answer:** The **Bridge Flap (or Palatal Bridge Flap)** is a sliding flap technique where a strip of palatal mucoperiosteum is incised parallel to the alveolar ridge. This "bridge" of tissue is then moved laterally across the alveolar ridge to cover the fistula. Because this flap must be slid across the ridge where teeth would normally be located, it can **only be performed in an edentulous maxilla**. If teeth were present, they would obstruct the lateral migration of the tissue bridge. **Analysis of Incorrect Options:** * **Rehrmann Flap (A):** This is a **buccal advancement flap**. It involves a trapezoidal incision in the buccal mucosa which is then advanced over the socket. It is the most common technique and can be used in both dentate and edentulous patients. * **Ashley Flap (B):** This is a **palatal flap** (specifically a rotational flap) based on the greater palatine artery. It is rotated to cover the defect and can be used regardless of the presence of teeth. * **Burger Flap (D):** This is another variation of a buccal flap (displaced flap) used for OAF closure, not restricted to edentulous patients. **Clinical Pearls for NEET-PG:** * **Most common site of OAF:** Maxillary 1st Molar (due to the proximity of roots to the sinus floor). * **Spontaneous closure:** Small fistulae ( 5mm almost always require surgical intervention. * **Prerequisite for surgery:** Before any flap surgery, the maxillary sinus must be free of infection (often requiring antibiotics or a Caldwell-Luc procedure). * **Gold Standard:** The Buccal Advancement Flap (Rehrmann) is the most frequently utilized clinical technique.

Q: All the following are complications of sphenoid sinus surgery except?

Orbital emphysema. **Explanation:** The sphenoid sinus is often referred to as the "most neglected sinus," but its surgical management requires precise anatomical knowledge due to its proximity to vital structures. **Why Orbital Emphysema is the Correct Answer:** Orbital emphysema occurs when air is forced into the orbital soft tissues, typically following a breach of the **lamina papyracea** (the thin medial wall of the orbit). This complication is classically associated with surgery of the **ethmoid sinus**, not the sphenoid sinus. While the sphenoid is near the orbital apex, its surgical boundaries do not typically involve the lamina papyracea. **Analysis of Incorrect Options:** * **Optic Nerve Injury:** The optic nerve runs in the lateral wall of the sphenoid sinus (often within the Onodi cell). Dehiscence of the bone covering the nerve is common, making it highly susceptible to injury during sphenoidotomy. * **Abducent (VI) Palsy:** The lateral wall of the sphenoid sinus is in direct contact with the **cavernous sinus**. The abducent nerve is the most medial structure within the cavernous sinus and is the cranial nerve most at risk during lateral wall instrumentation. * **CSF Leak:** The roof of the sphenoid sinus (planum sphenoidale) and the sella turcica are thin. Accidental penetration can lead to a dural tear and subsequent rhinorrhea. **High-Yield Clinical Pearls for NEET-PG:** * **Most common nerve injured in Sphenoid surgery:** Optic nerve (CN II). * **Most common nerve injured in Cavernous Sinus involvement:** Abducent nerve (CN VI). * **Onodi Cell:** A posterior-most ethmoid cell that migrates over the sphenoid sinus; it closely approximates the optic nerve and carotid artery. * **Vital Lateral Relations:** Internal Carotid Artery (ICA) and Cavernous Sinus.

Q: Which of the following best differentiates an antrochoanal polyp from an ethmoidal polyp?

Best seen on posterior rhinoscopy. **Explanation:** The primary distinction between an antrochoanal (AC) polyp and ethmoidal polyps lies in their origin, direction of growth, and clinical presentation. **Why the correct answer is right:** An **Antrochoanal polyp** originates from the maxillary sinus mucosa, exits through the natural or accessory ostium, and grows backward toward the choana and nasopharynx. Because of this posterior trajectory, it is often **best seen on posterior rhinoscopy** as a smooth, grayish-white mass hanging in the choana. In contrast, ethmoidal polyps are typically confined to the nasal cavity and are easily visualized on anterior rhinoscopy. **Analysis of incorrect options:** * **A & D (Multiple and Bilateral):** These are characteristic features of **Ethmoidal polyps**, which are usually multiple, bilateral, and resemble a "bunch of grapes." AC polyps are almost always **solitary and unilateral**. * **C (Recurrence on polypectomy):** While both can recur, ethmoidal polyps have a significantly higher recurrence rate due to their association with underlying conditions like allergy or aspirin sensitivity. Simple polypectomy for an AC polyp also carries a risk of recurrence if the antral base is not addressed, making this a poor differentiating factor. **High-Yield Clinical Pearls for NEET-PG:** * **Origin:** AC polyps arise from the **maxillary sinus** (Antrum); Ethmoidal polyps arise from **ethmoidal air cells**. * **Age:** AC polyps are more common in **children/young adults**; Ethmoidal polyps are more common in **adults**. * **Radiology:** On CT, AC polyps show the **"dumbbell" shape** (constriction at the ostium). * **Treatment of Choice:** For AC polyp, it is **Functional Endoscopic Sinus Surgery (FESS)** to remove the polyp along with its antral attachment. In older patients, Caldwell-Luc surgery was historically used.

Q: All of the following is true about inverted papilloma of the nose except?

In 5-10% of cases, it is associated with malignancy. ### Explanation Inverted Papilloma (Schneiderian Papilloma) is a benign but locally aggressive sinonasal tumor. **Why Option C is the correct answer (The False Statement):** While inverted papilloma is known for its association with **Squamous Cell Carcinoma (SCC)**, the incidence of malignancy is generally reported to be around **10–15%** (some texts cite up to 19%). Option C underestimates this risk. More importantly, in the context of NEET-PG questions, this option is often the "except" choice because the other three options represent definitive, classic characteristics of the disease. **Analysis of Incorrect Options (True Statements):** * **Option A:** It characteristically arises from the **lateral wall of the nose** (specifically the middle meatus or ethmoid sinus). This distinguishes it from common nasal polyps which often arise from the ethmoids. * **Option B:** It is almost always **unilateral**. Bilateral presentation is rare and should raise suspicion of other pathologies. * **Option D:** **Endoscopic endonasal excision** (often a Medial Maxillectomy) is currently the **treatment of choice**. While historical treatment involved lateral rhinotomy (Caldwell-Luc), advancements in endoscopes allow for complete clearance with lower morbidity. **Clinical Pearls for NEET-PG:** * **Histology:** It is called "inverted" because the surface epithelium proliferates and invaginates into the underlying stroma (rather than growing outward). * **Etiology:** Strongly associated with **Human Papillomavirus (HPV)** types 6, 11, 16, and 18. * **Recurrence:** It has a high recurrence rate (approx. 20-30%), necessitating long-term follow-up. * **Radiology:** On CT, it may show a "bony remodeling" or focal hyperostosis at the site of origin, which helps the surgeon identify the tumor stalk.

Question 1

A 26-year-old man has had difficulty breathing through his nose for 3 years, with progressive worsening over the past 2 months. Physical examination reveals glistening, translucent, polypoid masses filling the nasal cavities. Histologic examination of excised masses shows respiratory mucosa overlying an edematous stroma with scattered plasma cells and eosinophils. Which of the following laboratory findings is most likely to be present in this patient?

Accepted Answer

Increased serum IgE level

Answer

Elevated serum hemoglobin A1c level

Answer

Nuclear staining for Epstein-Barr virus antigens

Answer

Positive ANA test result

Question 2

The most common mucocele of the paranasal sinuses involving the orbit arises from which sinus?

Accepted Answer

Frontal sinus

Answer

Ethmoidal sinus

Answer

Maxillary sinus

Answer

Sphenoidal sinus

Question 3

A patient presents with an antrochoanal polyp arising from the medial wall of the maxilla. Which of the following would be the best management for the patient?

Accepted Answer

FESS with polypectomy

Answer

Medial maxillectomy (TEMM)

Answer

Caldwell-Luc procedure

Answer

Intranasal polypectomy

Question 4

Which of the following techniques can be used only in an edentulous maxilla to treat oro-antral fistula?

Accepted Answer

Bridge Flap

Answer

Rehrmann Flap

Answer

Ashley Flap

Answer

Burger Flap

Question 5

All the following are complications of sphenoid sinus surgery except?

Accepted Answer

Orbital emphysema

Answer

Optic nerve injury

Answer

Abducent palsy

Answer

CSF leak

Question 6

Which of the following best differentiates an antrochoanal polyp from an ethmoidal polyp?

Accepted Answer

Best seen on posterior rhinoscopy

Answer

Multiple

Answer

Recurrence on polypectomy

Answer

Bilateral

Question 7

Which of the following is NOT a cause of traumatic epistaxis?

Accepted Answer

Posterior epistaxis

Answer

Anterior epistaxis

Answer

Childhood

Answer

Adulthood

Question 8

Following a Caldwell-Luc procedure, through which anatomical structure is intranasal antrostomy performed?

Accepted Answer

Inferior meatus

Answer

Superior meatus

Answer

Middle meatus

Answer

Floor of the nose

Question 9

All of the following is true about inverted papilloma of the nose except?

Accepted Answer

In 5-10% of cases, it is associated with malignancy

Answer

Arises from the lateral wall of the nose

Answer

Usually unilateral

Answer

Endoscopic endonasal excision is the treatment of choice

Question 10

A 32-year-old female patient underwent extraction of a right upper first molar, resulting in a 0.3 mm perforation of the sinus wall. What procedure would you recommend?

Accepted Answer

No treatment required

Answer

Caldwell-Luc operation

Answer

Suture

Answer

Antibiotic dressing and secondary healing

Diseases of the Nose and Paranasal Sinuses — MCQs

Diseases of the Nose and Paranasal Sinuses — MCQs

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