Diseases of the Nose and Paranasal Sinuses Practice Questions

Q: Paranasal sinuses are ventilated during which phase of respiration?

Expiration. **Explanation:** The ventilation of the paranasal sinuses (PNS) is a paradoxical process that primarily occurs during **expiration**. **1. Why Expiration is Correct:** During expiration, the air being exhaled from the lungs is warm and moist. As this air passes through the nasal cavity, it creates a positive pressure gradient. According to the principles of airflow, this positive pressure "pushes" the warm, humidified air through the narrow ostia into the paranasal sinuses. This mechanism ensures that the sinuses are ventilated and their mucosal linings remain moist. **2. Why Other Options are Incorrect:** * **Inspiration (A, C, D):** During inspiration, air is drawn rapidly into the lungs, creating a negative pressure (suction effect) within the nasal cavity. This negative pressure actually tends to draw air *out* of the sinuses rather than into them. Therefore, whether it is mid-inspiration or deep inspiration, the pressure dynamics do not favor the entry of fresh air into the sinus cavities. **3. Clinical Pearls for NEET-PG:** * **Bernoulli’s Principle:** The rapid flow of air during inspiration across the sinus ostia creates a vacuum effect (negative pressure), which helps in the drainage of secretions but not ventilation. * **Gas Exchange:** While ventilation occurs during expiration, the actual exchange of oxygen and carbon dioxide within the sinus occurs slowly via diffusion through the ostia. * **Ostomeatal Complex:** This is the functional unit of the anterior ethmoid, frontal, and maxillary sinuses. Obstruction here (due to polyps or edema) prevents this expiratory ventilation, leading to sinusitis. * **Developmental Fact:** The **Maxillary** and **Ethmoid** sinuses are present at birth, while the **Frontal** sinus is the last to develop (clinically significant after age 6-7).

Q: Which of the following statements is true regarding rhinosporidiosis?

Surgery is the primary treatment.. **Explanation:** **Rhinosporidiosis** is a chronic granulomatous infection caused by *Rhinosporidium seeberi*. Although historically classified as a fungus, it is now recognized as an aquatic protistan parasite (Mesomycetozoea). **1. Why Option C is correct:** The primary treatment for rhinosporidiosis is **wide surgical excision** (usually via endonasal or external approach) with **electrocautery of the base**. Cauterization is crucial to prevent recurrence, which is common due to the spillage of endospores during surgery. Medical therapy is generally ineffective, though **Dapsone** is sometimes used as an adjunct to inhibit the maturation of sporangia and reduce recurrence rates. **2. Why other options are incorrect:** * **Option A:** While it presents as a granuloma, *R. seeberi* is **not a fungus**. It is a taxonomically unique eukaryotic pathogen. * **Option B:** Clinically, it presents as a **leafy, polypoidal, strawberry-like mass** that is highly vascular and bleeds easily on touch. It is typically **pinkish-red**, not grayish (grayish masses are more characteristic of ethmoidal polyps). * **Option D:** Radiotherapy has no role in the management of this infectious condition; it is reserved for malignancies. **High-Yield Clinical Pearls for NEET-PG:** * **Epidemiology:** Most common in South India (Tamil Nadu, Kerala) and Sri Lanka; associated with bathing in stagnant pond water. * **Histopathology:** Characterized by numerous **sporangia** in various stages of development, containing thousands of **endospores**. These stain well with GMS, PAS, and Mucicarmine. * **Site:** The **nasal septum** and floor of the nose are the most common sites, but it can affect the conjunctiva (Ocular rhinosporidiosis).

Q: All of the following are true of a submucous resection operation for DNS except?

Mucoperichondrium is removed. ### Explanation **Submucous Resection (SMR)** is a classic surgical procedure used to correct a Deviated Nasal Septum (DNS). The fundamental principle of SMR is the removal of the bony and cartilaginous framework of the septum while preserving the overlying mucosal flaps. **Why Option B is the Correct Answer (The "Except"):** In SMR, the **mucoperichondrium and mucoperiosteum are strictly preserved**. The surgeon elevates these flaps to access the underlying cartilage and bone. Removing the mucoperichondrium would lead to large septal perforations, loss of blood supply to the remaining cartilage, and significant crusting. Therefore, saying it is "removed" is factually incorrect. **Analysis of Other Options:** * **Option A (Indicated in DNS):** This is the primary indication. It is performed when a deviated septum causes functional obstruction or headaches (Sluder’s neuralgia). * **Option C (Preferably done after 16 years):** SMR involves the removal of a significant portion of the septal framework. If done in children, it can interfere with the growth of the midface and the bridge of the nose. Hence, it is traditionally delayed until skeletal maturity (16–18 years). * **Option D (Done in epistaxis):** SMR is indicated in cases of epistaxis where a septal spur causes localized drying/ulceration or when the deviation prevents access to a bleeding point for cauterization. **High-Yield Clinical Pearls for NEET-PG:** * **Killian’s Incision:** The standard incision for SMR, made 5mm above the caudal border of the septal cartilage. * **Complications:** The most common complication of SMR is a **septal hematoma**, which if untreated, leads to a **septal abscess** and subsequent **Saddle Nose Deformity**. * **SMR vs. Septoplasty:** Unlike SMR, Septoplasty is a more conservative "reconstructive" surgery that can be performed in children and preserves more of the septal framework.

Q: A biopsy taken from a granulomatous lesion of the nose revealed Mikulicz's cells and eosinophilic structures in the cytoplasm of the plasma cells. What is the likely diagnosis?

Rhinoscleroma. **Explanation:** The clinical presentation and histopathological findings described are classic for **Rhinoscleroma**, a chronic granulomatous disease caused by the Gram-negative coccobacillus *Klebsiella pneumoniae subsp. rhinoscleromatis* (Frisch bacillus). **Why Rhinoscleroma is correct:** The diagnosis is confirmed by two pathognomonic histological features: 1. **Mikulicz’s Cells:** Large, foamy histiocytes (macrophages) with vacuolated cytoplasm containing the causative organism. 2. **Russell Bodies:** Eosinophilic, hyaline-like inclusions found in the cytoplasm of plasma cells, representing accumulated immunoglobulin. **Why other options are incorrect:** * **Mucormycosis:** A fungal infection characterized by broad, non-septate hyphae with right-angle branching and extensive angioinvasion leading to necrosis. It does not show Mikulicz’s cells. * **Rhinosporidiosis:** Caused by *Rhinosporidium seeberi*, it presents with friable, strawberry-like nasal masses. Histology shows large, thick-walled **sporangia** containing numerous endospores. * **Nasal Leprosy:** Caused by *Mycobacterium leprae*. While it is a granulomatous disease, it is characterized by acid-fast bacilli (AFB) and, in the lepromatous form, "foamy" Lepra cells, but lacks Russell bodies and the specific Frisch bacillus. **High-Yield Pearls for NEET-PG:** * **Stages of Rhinoscleroma:** Atrophic stage (resembles atrophic rhinitis) → Granulomatous/Proliferative stage (painless nodules) → Cicatricial stage (stenosis and scarring). * **Hebra Nose:** The characteristic external deformity caused by expansion of the nasal framework in the proliferative stage. * **Treatment:** Long-term antibiotics (Streptomycin and Tetracycline are traditional; Ciprofloxacin is now preferred). * **Site:** It most commonly involves the nasal septum and floor but can spread to the nasopharynx and larynx.

Q: Which sinus is least involved in children?

Sphenoid. **Explanation:** The development of paranasal sinuses follows a specific chronological order, which is a high-yield topic for NEET-PG. The correct answer is **Sphenoid** because it is the last sinus to pneumatize and become clinically significant. **1. Why Sphenoid is the Correct Answer:** The sphenoid sinus is absent at birth. It starts to pneumatize around the age of 3–5 years but remains very small throughout early childhood. It only reaches its full size and clinical relevance after puberty (around 12–15 years). Therefore, it is the least involved in pediatric sinusitis. **2. Analysis of Incorrect Options:** * **Ethmoid (A):** This is the **most developed** sinus at birth and is the most common site for sinusitis in infants and young children. * **Maxillary (B):** Present at birth (though small) and rapidly expands during the eruption of deciduous teeth. It is frequently involved in childhood respiratory infections. * **Frontal (C):** Not present at birth. It starts developing from the anterior ethmoid cells around age 2 and is radiologically visible by age 6–7. While it develops late, the sphenoid remains less frequently involved in the early pediatric age group. **Clinical Pearls for NEET-PG:** * **Order of Development:** Ethmoid → Maxillary → Sphenoid → Frontal. * **First to develop (Embryologically):** Maxillary (at 10 weeks gestation). * **Present at birth:** Ethmoid and Maxillary. * **Radiologically visible at birth:** Only Ethmoid. * **Most common sinus involved in children:** Ethmoid. * **Most common sinus involved in adults:** Maxillary.

Q: What is Pott's puffy tumor?

Osteomyelitis of the frontal bone. **Explanation:** **Pott’s Puffy Tumor** is a clinical entity characterized by **subperiosteal abscess** associated with **osteomyelitis of the frontal bone**. It typically occurs as a complication of acute or chronic frontal sinusitis or, less commonly, due to direct head trauma. 1. **Why Option C is correct:** The infection from the frontal sinus spreads to the marrow of the frontal bone (osteomyelitis), leading to bone necrosis. This results in a collection of pus between the bone and the periosteum, manifesting clinically as a soft, fluctuant, "puffy" swelling on the forehead. 2. **Why other options are incorrect:** * **Option A:** Osteosarcoma is a primary malignant bone tumor, not an infectious process. * **Option B:** Adamantinoma (Ameloblastoma) is a benign but locally aggressive odontogenic tumor typically involving the mandible, unrelated to the frontal bone or sinusitis. * **Option D:** While aspergillosis can affect the sinuses, Pott’s Puffy Tumor is specifically defined by bacterial osteomyelitis (often polymicrobial, including anaerobes and Streptococci). **High-Yield Clinical Pearls for NEET-PG:** * **Eponym:** Named after Sir Percivall Pott (1760). * **Clinical Presentation:** Forehead swelling, fever, and headache. * **Complications:** It is a surgical emergency because it can lead to intracranial complications like **epidural abscess**, subdural empyema, or meningitis. * **Diagnosis:** Contrast-enhanced CT (CECT) is the gold standard to visualize bone destruction and intracranial extension. * **Management:** Requires intravenous antibiotics and surgical drainage (often via endoscopic sinus surgery or trephination).

Q: Merciful anosmia is seen in which of the following conditions?

Atrophic rhinitis. **Explanation:** **Atrophic Rhinitis (Ozena)** is the correct answer. The term **"Merciful Anosmia"** refers to a clinical paradox where a patient suffers from a foul-smelling nasal discharge (putrefaction of crusts) that is highly offensive to others, yet the patient themselves cannot smell it. This occurs because the chronic atrophic process destroys the olfactory neuroepithelium and nerve endings, rendering the patient anosmic. It is "merciful" because it spares the patient from their own repulsive odor. **Analysis of Options:** * **Allergic Rhinitis:** Characterized by sneezing, itching, and watery rhinorrhea. While it may cause temporary hyposmia due to mucosal edema, it does not involve the destruction of olfactory nerves or foul-smelling crusts. * **Ethmoidal Polyposis:** These are non-neoplastic masses that cause **conductive anosmia** by physically blocking odors from reaching the olfactory cleft. However, there is no "merciful" component as there is typically no foul odor unless secondary infection occurs. * **Wegener’s Granulomatosis (GPA):** While it causes nasal crusting and septal perforation, it is a systemic vasculitis. While it can lead to anosmia, the specific clinical term "merciful anosmia" is classically reserved for Atrophic Rhinitis. **Clinical Pearls for NEET-PG:** * **Atrophic Rhinitis Triad:** Roomy nasal cavity, foul-smelling crusts (Ozena), and Merciful Anosmia. * **Organism:** *Klebsiella ozaenae* (Abel’s bacillus). * **Surgical Management:** **Young’s operation** or Modified Young’s (closing the nostrils to allow the mucosa to heal). * **Bernoulli’s Phenomenon:** Explains why the nose feels blocked despite being "roomy" (lack of air resistance due to excessive patency).

Q: What is the most common intracranial complication of chronic sinusitis?

Subdural abscess. **Explanation:** The correct answer is **Subdural abscess**. **Why Subdural Abscess is Correct:** In the context of **chronic sinusitis** (particularly involving the frontal sinus), a subdural abscess is the most frequently encountered intracranial complication. The infection typically spreads via **retrograde thrombophlebitis** through the valveless diploic veins of Breschet. Because the subdural space is a large, potential space with little resistance, pus can spread rapidly over the cerebral hemispheres. Clinically, it is a neurosurgical emergency characterized by rapid neurological deterioration, seizures, and signs of increased intracranial pressure. **Analysis of Incorrect Options:** * **Meningitis:** While meningitis is the most common intracranial complication of **acute** sinusitis (and the most common complication of ear infections), it is less frequent than subdural abscess in chronic sinus disease. * **Brain Abscess:** This is the second most common intracranial complication of chronic sinusitis. It usually occurs in the frontal lobe and develops more slowly than a subdural abscess. * **Cavernous Sinus Thrombosis:** This is a rare but life-threatening complication, most commonly arising from infections of the "danger area of the face" or the sphenoid and ethmoid sinuses. **NEET-PG High-Yield Pearls:** * **Most common overall complication of sinusitis:** Orbital complications (specifically Preseptal/Orbital cellulitis). * **Most common intracranial complication of ACUTE sinusitis:** Meningitis. * **Most common intracranial complication of CHRONIC sinusitis:** Subdural abscess. * **Pott’s Puffy Tumor:** This is osteomyelitis of the frontal bone with a subperiosteal abscess, often seen as a precursor or accompaniment to intracranial spread. * **Imaging Gold Standard:** Contrast-enhanced CT or MRI (MRI is superior for intracranial soft tissue detail).

Question 1

Paranasal sinuses are ventilated during which phase of respiration?

Accepted Answer

Expiration

Answer

Inspiration

Answer

Mid inspiration

Answer

Deep inspiration

Question 2

Which of the following statements is true regarding rhinosporidiosis?

Accepted Answer

Surgery is the primary treatment.

Answer

It presents as a fungal granuloma.

Answer

It appears as a grayish mass.

Answer

Radiotherapy is the recommended treatment.

Question 3

All of the following are true of a submucous resection operation for DNS except?

Accepted Answer

Mucoperichondrium is removed

Answer

Indicated in septal deviation

Answer

Preferably done after 16 years of age

Answer

Done in some cases of epistaxis

Question 4

A biopsy taken from a granulomatous lesion of the nose revealed Mikulicz's cells and eosinophilic structures in the cytoplasm of the plasma cells. What is the likely diagnosis?

Accepted Answer

Rhinoscleroma

Answer

Mucormycosis

Answer

Rhinosporidiosis

Answer

Nasal leprosy

Question 5

Which sinus is least involved in children?

Accepted Answer

Sphenoid

Answer

Ethmoid

Answer

Maxillary

Answer

Frontal

Question 6

What is Pott's puffy tumor?

Accepted Answer

Osteomyelitis of the frontal bone

Answer

Osteosarcoma of the frontal bone

Answer

Adamantinoma of the mandible

Answer

Proliferative aspergillosis of the maxillary sinus

Question 7

Merciful anosmia is seen in which of the following conditions?

Accepted Answer

Atrophic rhinitis

Answer

Allergic rhinitis

Answer

Ethmoidal polyposis

Answer

Wegener's granulomatosis

Question 8

A 35-year-old male presented with nasal discharge, facial pain, and fever, which subsided with a course of antibiotics and antihistamines but recurred again after 2 months. On examination, there was mucopurulent discharge from the middle meatus and inflamed sinus openings. What is the investigation of choice?

Accepted Answer

NCCT PNS

Answer

X-ray PNS

Answer

MRI of the face

Answer

Inferior meatal puncture

Question 9

What is the most common intracranial complication of chronic sinusitis?

Accepted Answer

Subdural abscess

Answer

Brain abscess

Answer

Meningitis

Answer

Cavernous sinus thrombosis

Question 10

Which of the following are complications of acute sinusitis?

Accepted Answer

Subdural abscess

Answer

Orbital cellulitis

Answer

Pott's puffy tumour

Answer

Conjunctival chemosis

Diseases of the Nose and Paranasal Sinuses — MCQs

Diseases of the Nose and Paranasal Sinuses — MCQs

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