Diseases of the Nose and Paranasal Sinuses Practice Questions

Q: A patient uses nasal drops continuously for a prolonged period. What is a possible adverse effect?

Rhinitis medicamentosa. ### Explanation **Rhinitis Medicamentosa** is a condition of rebound nasal congestion caused by the prolonged use of topical nasal decongestants (typically **oxymetazoline** or **xylometazoline**). These drugs are sympathomimetic amines that cause vasoconstriction. When used for more than 3–5 days, they lead to a "rebound" phenomenon where the nasal mucosa becomes chronically congested and hypertrophied due to the downregulation of alpha-receptors and interstitial edema. This creates a vicious cycle where the patient uses more drops to relieve the worsening obstruction. **Analysis of Incorrect Options:** * **A. Mulberry turbinate:** This refers to the characteristic appearance of the posterior end of the inferior turbinate in **Chronic Hypertrophic Rhinitis**. It is caused by permanent thickening of the mucosa and submucosa, often due to chronic infection or allergy, rather than acute medication rebound. * **B. Allergic rhinitis:** This is an IgE-mediated hypersensitivity reaction to inhaled allergens (pollen, dust). While it presents with congestion, it is characterized by sneezing, itching, and watery rhinorrhea, not drug overuse. * **C. Vasomotor rhinitis:** This is a non-allergic, non-infectious condition caused by autonomic instability (parasympathetic overactivity). It is triggered by environmental changes like temperature, humidity, or strong odors, rather than topical medications. **High-Yield Clinical Pearls for NEET-PG:** * **Treatment:** The first step is immediate withdrawal of the nasal drops. Topical or systemic steroids are often prescribed to manage the withdrawal congestion. * **Duration:** Advise patients never to use topical decongestants for more than **5 consecutive days**. * **Pathology:** Look for keywords like "rebound congestion" and "tachyphylaxis" (diminishing response to successive doses).

Q: In acute sinusitis, which paranasal sinus is most commonly involved in children?

Ethmoid. **Explanation:** The correct answer is **Ethmoid (Option C)**. The primary reason lies in the embryological development and chronological appearance of the paranasal sinuses. 1. **Why Ethmoid is Correct:** The ethmoid sinuses are the only sinuses that are **well-developed and pneumatized at birth**. Because they are present and functional from infancy, they are the most frequent site of infection in young children. Furthermore, the ethmoid air cells have small ostia that easily become obstructed during viral upper respiratory infections, leading to secondary bacterial sinusitis. 2. **Why other options are incorrect:** * **Maxillary:** While the maxillary sinus is present at birth, it is merely a small slit and only becomes clinically significant and a common site of infection after the age of 3–4 years. In **adults**, the maxillary sinus is the most commonly involved. * **Sphenoid:** This sinus starts to pneumatize around age 3–5 and reaches adult size only by puberty. It is rarely involved in isolated acute sinusitis in children. * **Frontal:** This is the last sinus to develop. It is not radiologically visible until age 6–7 and does not fully develop until late adolescence. Therefore, frontal sinusitis is almost never seen in early childhood. **High-Yield Clinical Pearls for NEET-PG:** * **Order of development:** Ethmoid > Maxillary > Sphenoid > Frontal (Mnemonic: **E**very **M**edical **S**tudent **F**ails). * **Most common sinus involved in adults:** Maxillary Sinus. * **Most common complication of Ethmoiditis:** Orbital cellulitis (due to the thin *lamina papyracea*). * **First sinus to develop (embryologically):** Maxillary (around the 3rd month of fetal life), but Ethmoid is the most developed at birth.

Q: What is the most common cause of traumatic cerebrospinal fluid (CSF) rhinorrhea?

Injury to the ethmoidal air sinus. **Explanation:** Traumatic cerebrospinal fluid (CSF) rhinorrhea occurs when there is a breach in the bone and the underlying dura mater, creating a communication between the subarachnoid space and the nasal cavity. **Why Option A is Correct:** The **cribriform plate of the ethmoid bone** and the **fovea ethmoidalis** (roof of the ethmoid sinus) are the most common sites for CSF leaks. This is because the bone in this region is extremely thin (often less than 0.5 mm) and the dura mater is tightly adherent to the bone, making it highly susceptible to dural tears even with minor head trauma or during endoscopic sinus surgery (ESS). **Why Other Options are Incorrect:** * **Option B (Maxillary Sinus):** The maxillary sinus is located inferiorly and does not have a direct anatomical relationship with the cranial fossa. Fractures here do not typically result in CSF leaks unless associated with extensive skull base trauma. * **Option C (Frontal Bone):** While fractures of the posterior table of the frontal sinus can cause CSF rhinorrhea, they are less frequent than ethmoidal injuries. The frontal bone is significantly thicker and more robust than the ethmoid bone. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of leak:** Cribriform plate (Ethmoid bone). * **Diagnostic Test of Choice (Biochemical):** **Beta-2 Transferrin** (most specific) or Beta-trace protein. * **Imaging of Choice:** **High-Resolution CT (HRCT)** of the paranasal sinuses to identify the bony defect. * **Target Sign/Halo Sign:** Seen when CSF is mixed with blood on a paper/linen (CSF migrates further, forming a clear outer ring). * **Management:** Most traumatic leaks (80%) resolve with conservative management (bed rest, head elevation, avoiding straining). If persistent, endoscopic endonasal repair is the preferred surgical approach.

Q: Killian's incision is used for?

Submucous resection of nasal septum. ### Explanation **Correct Answer: A. Submucous resection of nasal septum** **Why it is correct:** Killian’s incision is the classic incision used for **Submucous Resection (SMR)** of the nasal septum. It is a slanted, curvilinear incision made on the nasal septum, approximately **5 mm superior and posterior** to the caudal margin of the septal cartilage. It is specifically designed to bypass the columella and access the subperichondrial plane to remove the deflected bony and cartilaginous parts of the septum while preserving the mucosal flaps. **Analysis of Incorrect Options:** * **B. Intranasal antrostomy:** This procedure involves creating an opening in the inferior meatus to drain the maxillary sinus. It does not involve a septal incision. * **C. Caldwell-Luc operation:** This is a radical antrum operation where the maxillary sinus is accessed via a **sublabial incision** (in the gingivolabial sulcus) above the canine fossa. * **D. Myringoplasty:** This is an otological procedure used to repair a perforation of the tympanic membrane. Common incisions include the Wilde’s post-aural or Endaural (Lempert’s) incision. **High-Yield Clinical Pearls for NEET-PG:** * **Killian’s vs. Freer’s Incision:** While Killian’s is used for SMR, **Freer’s incision** (hemitransfixion incision) is made at the very **caudal border** of the septal cartilage and is the preferred incision for **Septoplasty**, especially when correcting caudal dislocations. * **SMR Contraindication:** SMR is generally avoided in children (usually below 17 years) as it can interfere with midfacial growth, leading to a saddle nose deformity. * **Complication:** The most common complication of SMR is a septal perforation, often occurring at the site of the incision if bilateral mucosal tears occur.

Q: Which of the following statements is NOT true about the frontal sinus?

It is present at birth.. **Explanation:** The correct answer is **D (It is present at birth)** because the frontal sinus is not anatomically present at birth. It is the last paranasal sinus to develop, typically appearing radiologically around the age of 5–7 years and reaching full adult size after puberty (around age 15–20). **Analysis of Options:** * **Option A (Osteomas are common):** This is a true statement. The frontal sinus is the most common site for paranasal sinus osteomas (benign bony tumors). They are often asymptomatic and discovered incidentally on imaging. * **Option B (Morning headaches):** This is a classic clinical feature of frontal sinusitis. It is often referred to as an **"Office Headache"**—the pain typically starts in the morning, peaks by midday as the sinus drains via gravity, and subsides by the evening. * **Option C (Opens into the middle meatus):** This is anatomically correct. The frontal sinus drains into the middle meatus via the frontonasal duct, which opens into the anterior part of the hiatus semilunaris or the ethmoid infundibulum. **NEET-PG High-Yield Pearls:** * **Developmental Sequence:** Ethmoid (present at birth) → Maxillary (present at birth, but rudimentary) → Sphenoid (appears age 3–5) → Frontal (appears age 5–7). * **Radiology:** The frontal sinus is the most common sinus to be **agenetic** (absent) in about 5-10% of the population. * **Complications:** Frontal sinusitis can lead to **Pott’s Puffy Tumor**, which is a subperiosteal abscess of the frontal bone presenting as a doughy swelling on the forehead.

Q: Which of the following is a complication of sinus disease?

Superior orbital fissure syndrome. **Explanation:** **Superior Orbital Fissure Syndrome (SOFS)** is a rare but serious complication of inflammatory or infectious sinus disease, particularly involving the **sphenoid sinus**. The sphenoid sinus is anatomically adjacent to the superior orbital fissure. When infection or inflammation spreads to this fissure, it compresses or affects the structures passing through it, leading to a characteristic clinical triad: 1. **Ophthalmoplegia:** Paralysis of Cranial Nerves III, IV, and VI (leading to a fixed, dilated pupil and loss of eye movement). 2. **Sensory Loss:** Anesthesia in the distribution of the Ophthalmic nerve (V1). 3. **Proptosis:** Due to venous congestion and muscle paralysis. **Why other options are incorrect:** * **Orbital Cellulitis & Cavernous Sinus Thrombosis (CST):** While these are indeed complications of sinusitis (ethmoid and sphenoid respectively), they are categorized as **orbital** and **intracranial** complications. In the context of specific "syndromes" arising from sinus disease extension, SOFS is a distinct clinical entity involving the bony fissure itself. * **Retrobulbar Neuritis:** This is an inflammation of the optic nerve (CN II). While it can rarely occur with sphenoiditis, the optic nerve passes through the **Optic Canal**, not the superior orbital fissure. If the optic nerve is involved along with SOFS, it is termed **Orbital Apex Syndrome**. **High-Yield NEET-PG Pearls:** * **Most common sinus causing orbital complications:** Ethmoid sinus (due to the thin *lamina papyracea*). * **Orbital Apex Syndrome:** SOFS + Optic nerve involvement (Vision loss/Blindness). * **Chandler’s Classification:** Used to grade orbital complications of sinusitis (Stage I: Preseptal cellulitis to Stage V: CST). * **Key differentiator:** In SOFS, vision is preserved; in Orbital Apex Syndrome, vision is lost.

Question 1

A patient uses nasal drops continuously for a prolonged period. What is a possible adverse effect?

Accepted Answer

Rhinitis medicamentosa

Answer

Mulberry turbinate

Answer

Allergic rhinitis

Answer

Vasomotor rhinitis

Question 2

Which of the following is NOT true about rhinoscleroma?

Accepted Answer

It is caused by Klebsiella rhinoscleromatis.

Answer

It is a slowly progressing granulomatous disease.

Answer

It is most common in young adults aged 20-30 years.

Answer

Poor nutrition is a contributing factor to its spread.

Question 3

In acute sinusitis, which paranasal sinus is most commonly involved in children?

Accepted Answer

Ethmoid

Answer

Maxillary

Answer

Sphenoid

Answer

Frontal

Question 4

What is the most common cause of traumatic cerebrospinal fluid (CSF) rhinorrhea?

Accepted Answer

Injury to the ethmoidal air sinus

Answer

Injury to the maxillary sinus

Answer

Injury to the frontal bone

Answer

None of the above

Question 5

Which of the following is not a common site of epistaxis?

Accepted Answer

Posterosuperior aspect above superior turbinate

Answer

Little's area

Answer

Woodruff's area

Answer

Middle meatus

Question 6

A 35-year-old male presented with nasal discharge, facial pain, and fever which persisted with several courses of antibiotics and antihistamines over a period of 3 months. On nasal endoscopy, mucopurulent discharge from the middle meatus and inflamed sinus openings were seen. His NCCT nose and PNS shows findings consistent with chronic sinusitis. What is the best management approach for this patient?

Accepted Answer

Functional endoscopic sinus surgery

Answer

Repeated antral washout

Answer

Caldwell-Luc operation

Answer

Lynch Howarth operation

Question 7

A 2-year-old patient presents with pain over the bridge of the nose, medial and deep to the eye, aggravated by eyeball movements. The patient also complains of nasal discharge. Examination reveals edema of both eyelids and swelling of the middle turbinate. Involvement of which of the following paranasal sinuses is suspected?

Accepted Answer

Ethmoid Sinus

Answer

Maxillary Sinus

Answer

Frontal sinus

Answer

Sphenoid sinus

Question 8

Killian's incision is used for?

Accepted Answer

Submucous resection of nasal septum

Answer

Intranasal antrostomy

Answer

Caldwell-Luc operation

Answer

Myringoplasty

Question 9

Which of the following statements is NOT true about the frontal sinus?

Accepted Answer

It is present at birth.

Answer

Osteomas are common.

Answer

Sinusitis can lead to morning headaches.

Answer

It opens into the middle meatus.

Question 10

Which of the following is a complication of sinus disease?

Accepted Answer

Superior orbital fissure syndrome

Answer

Retrobulbar neuritis

Answer

Orbital cellulitis

Answer

Cavernous sinus thrombosis

Diseases of the Nose and Paranasal Sinuses — MCQs

Diseases of the Nose and Paranasal Sinuses — MCQs

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