Endoscopic Skull Base Surgery Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Endoscopic Skull Base Surgery. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Endoscopic Skull Base Surgery Indian Medical PG Question 1: Intrathecal fluorescein with endoscopic visualization is useful in diagnosis of?
- A. Rhinitis Medicamentosa
- B. Multiple ethmoidal polyps
- C. Diagnosis of CSF Rhinorrhoea (Correct Answer)
- D. Deviated nasal septum
Endoscopic Skull Base Surgery Explanation: ***Diagnosis of CSF Rhinorrhoea***
- **Intrathecal fluorescein** is instilled into the cerebrospinal fluid, and its presence in the nasal cavity via endoscopy confirms a **CSF leak**.
- This method provides direct visualization of the leak site, which is crucial for surgical planning.
*Rhinitis Medicamentosa*
- This condition is caused by overuse of **topical decongestants** and characterized by nasal congestion, not a CSF leak.
- Diagnosis is typically based on patient history and clinical examination rather than specialized imaging or dye studies.
*Multiple ethmoidal polyps*
- **Ethmoidal polyps** are benign growths in the ethmoid sinuses, causing nasal obstruction and anosmia.
- Diagnosis is made via nasal endoscopy and CT scan, and fluorescein staining is not indicated.
*Deviated nasal septum*
- A **deviated nasal septum** is a structural abnormality causing unilateral or bilateral nasal obstruction.
- Diagnosis is clinical and confirmed by anterior rhinoscopy or nasal endoscopy, with no role for intrathecal fluorescein.
Endoscopic Skull Base Surgery Indian Medical PG Question 2: A lady comes to OPD after fall from scooty. Her vitals are stable. She is having continuous, clear watery discharge from nose after 2 days. This is most likely a feature of?
- A. CSF rhinorrhoea (Correct Answer)
- B. Acute respiratory infection
- C. Rhinitis
- D. Middle cranial fossa fracture
Endoscopic Skull Base Surgery Explanation: ***CSF rhinorrhoea***
- **Clear watery discharge** appearing **two days after head trauma** (fall from scooty) is highly suggestive of **cerebrospinal fluid (CSF) rhinorrhoea**.
- This occurs due to a breach in the **skull base**, allowing CSF to leak from the subarachnoid space into the nasal cavity.
*Acute respiratory infection*
- An acute respiratory infection typically presents with symptoms like **fever, cough**, and **nasal discharge** that is often thicker and discolored, not clear and watery.
- The onset of discharge two days after trauma without other signs of infection also makes this less likely.
*Rhinitis*
- Rhinitis involves inflammation of the nasal mucosa, leading to watery discharge, sneezing, and congestion.
- However, the traumatic etiology and the specific timing of the discharge make **CSF leak** a more pertinent diagnosis than simple rhinitis.
*Middle cranial fossa fracture*
- While a **middle cranial fossa fracture** can cause CSF leakage, the discharge from the nose (rhinorrhoea) typically originates from an **anterior cranial fossa fracture**.
- A middle cranial fossa fracture is more commonly associated with **otorrhoea** (CSF leakage from the ear) if the temporal bone is involved.
Endoscopic Skull Base Surgery Indian Medical PG Question 3: Most difficult site to remove cholesteatoma from the sinus tympani is related to:
- A. Anterior facial ridge
- B. Epitympanum
- C. Hypotympanum
- D. Posterior facial ridge (Correct Answer)
Endoscopic Skull Base Surgery Explanation: **Posterior facial ridge**
- The **posterior facial ridge** forms a critical anatomical barrier, often **obscuring the sinus tympani** and making cholesteatoma removal difficult due to limited access and visibility.
- Its presence necessitates careful surgical technique to avoid **facial nerve injury** while ensuring complete eradication of disease.
*Anterior facial ridge*
- The **anterior facial ridge** is less directly involved in defining the access to the sinus tympani, thus not posing as significant a surgical challenge for cholesteatoma removal in this specific area.
- Its anatomical position typically allows for better visualization and maneuverability compared to the posterior ridge.
*Epitympanum*
- The **epitympanum**, while a common site for cholesteatoma, is generally more accessible surgically than the sinus tympani because of its location superior to the tympanic membrane.
- Its removal often involves mastoidectomy or atticotomy, which provides direct views.
*Hypotympanum*
- The **hypotympanum** is located inferior to the tympanic membrane and is typically more open and accessible, allowing for easier visualization and removal of cholesteatoma.
- It does not present the same deep, narrow, and obstructed surgical field as the sinus tympani, especially in relation to the facial nerve.
Endoscopic Skull Base Surgery Indian Medical PG Question 4: A nasal surgery was carried out with the incision shown in the image. What was the procedure likely carried out?
- A. Submucosal resection (SMR)
- B. FESS (Functional Endoscopic Sinus Surgery)
- C. Open rhinoplasty (Correct Answer)
- D. Caldwell-Luc's procedure
Endoscopic Skull Base Surgery Explanation: ***Open rhinoplasty***
- The image displays a **transcolumellar incision** (typically inverted V or W-shaped), which is the hallmark approach for **open rhinoplasty**.
- This incision allows for direct visualization of the underlying nasal cartilages and bones, enabling precise reshaping of the nose.
*Submucosal resection (SMR)*
- SMR is a procedure to correct a **deviated nasal septum** by removing cartilage or bone from beneath the mucoperichondrial flaps.
- It involves an **intranasal incision**, usually along the septal mucosa, not an external transcolumellar incision.
*FESS (Functional Endoscopic Sinus Surgery)*
- FESS is a minimally invasive procedure used to treat **chronic sinusitis** and other sinus conditions.
- It is performed entirely **endoscopically through the nostrils**, with no external incisions on the nasal columella.
*Caldwell-Luc's procedure*
- This procedure accesses the **maxillary sinus** through an incision in the upper gum beneath the lip.
- It is used for drainage of the maxillary sinus or removal of foreign bodies/tumors, and does not involve an external nasal incision.
Endoscopic Skull Base Surgery Indian Medical PG Question 5: Which of the following is not a complication of maxillary sinus lavage and insufflation?
- A. Orbital injury
- B. Epistaxis
- C. Facial nerve injury (Correct Answer)
- D. Air embolism
Endoscopic Skull Base Surgery Explanation: ***Facial nerve injury***
- The **facial nerve (CN VII)** passes through the parotid gland and temporal bone, far from the maxillary sinus.
- There is no anatomical proximity or procedural mechanism during maxillary sinus lavage and insufflation that would put the facial nerve at risk of injury.
*Air embolism*
- **Insufflation of air** into the maxillary sinus, especially under pressure, can lead to air entering the bloodstream if a blood vessel is inadvertently punctured.
- This can result in a serious and potentially fatal **air embolism**, particularly if the air reaches the cerebral circulation.
*Orbital injury*
- The **medial wall of the maxillary sinus** is in close proximity to the orbit, separated by thin bone.
- During lavage, excessive force or incorrect angulation of instruments can perforate this thin bone, leading to **orbital complications** such as periorbital hematoma or injury to orbital contents.
*Epistaxis*
- During the procedure, the **mucosa of the nasal cavity** or the sinus itself can be traumatized by the instruments used for lavage.
- This local trauma to the rich blood supply of these areas can easily cause **nasal bleeding (epistaxis)**.
Endoscopic Skull Base Surgery Indian Medical PG Question 6: Which of the following is a common topical use of the medicine shown in the image?
- A. Rhino cerebral mucormycosis
- B. Inlay type I myringoplasty
- C. Post-adenoidectomy to control bleeding (Correct Answer)
- D. Subglottic stenosis
Endoscopic Skull Base Surgery Explanation: ***Post-adenoidectomy to control bleeding***
- The image shows **Neo-Synephrine (phenylephrine)**, a potent **alpha-adrenergic agonist** that causes **vasoconstriction**.
- Its vasoconstrictive properties make it useful topically to reduce **bleeding** during and after surgical procedures like **adenoidectomy**.
*Rhino cerebral mucormycosis*
- This is a serious fungal infection requiring systemic antifungal therapy, often **amphotericin B**. Topical phenylephrine has no role in treating the infection itself.
- While bleeding might be a symptom of mucormycosis, phenylephrine would only offer temporary symptomatic relief, not address the underlying fungal pathology.
*Inlay type I myringoplasty*
- Myringoplasty is a surgical procedure to repair a perforated eardrum. Topical phenylephrine is not indicated for this procedure.
- The primary goal of this surgery is to reconstruct the **tympanic membrane**, and phenylephrine would not contribute to tissue healing or graft integration.
*Subglottic stenosis*
- This condition involves narrowing of the airway below the vocal cords, often requiring surgical intervention or corticosteroids.
- Phenylephrine is a decongestant and vasoconstrictor, and as such, it does not have a therapeutic role in resolving the **fibrotic narrowing** characteristic of subglottic stenosis.
Endoscopic Skull Base Surgery Indian Medical PG Question 7: Statement 1 - A 59-year-old patient presents with flaccid bullae. Histopathology shows a suprabasal acantholytic split.
Statement 2 - The row of tombstones appearance is diagnostic of Pemphigus vulgaris.
- A. Statements 1 & 2 are correct, 2 is not explaining 1 (Correct Answer)
- B. Statements 1 and 2 are correct and 2 is the correct explanation for 1
- C. Statements 1 and 2 are incorrect
- D. Statement 1 is incorrect
Endoscopic Skull Base Surgery Explanation: ***Correct: Statements 1 & 2 are correct, 2 is not explaining 1***
**Analysis of Statement 1:**
- A 59-year-old patient with **flaccid bullae** and **suprabasal acantholytic split** on histopathology is the classic presentation of **Pemphigus vulgaris**
- The flaccid (easily ruptured) nature of bullae distinguishes it from tense bullae seen in bullous pemphigoid
- The suprabasal location of the split (just above the basal layer) with acantholysis (loss of cell-to-cell adhesion) is pathognomonic
- **Statement 1 is CORRECT** ✓
**Analysis of Statement 2:**
- The **"row of tombstones" or "tombstone appearance"** is indeed a diagnostic histopathological feature of Pemphigus vulgaris
- This appearance results from basal keratinocytes remaining attached to the basement membrane while suprabasal cells separate due to acantholysis
- The intact basal cells standing upright resemble a row of tombstones
- **Statement 2 is CORRECT** ✓
**Does Statement 2 explain Statement 1?**
- Statement 2 describes a **histopathological appearance** (tombstone pattern) that is a **consequence** of the suprabasal split
- However, it does NOT explain the **underlying cause** of the flaccid bullae or the suprabasal split
- The true explanation involves **IgG autoantibodies against desmoglein 3 (and desmoglein 1)**, which attack intercellular adhesion structures (desmosomes), causing **acantholysis**
- Therefore, **Statement 2 does NOT explain Statement 1** ✗
*Incorrect: Statement 2 is the correct explanation for Statement 1*
- While both statements describe features of Pemphigus vulgaris, the tombstone appearance is a descriptive finding, not an explanatory mechanism
*Incorrect: Statements 1 and 2 are incorrect*
- Both statements are medically accurate descriptions of Pemphigus vulgaris features
*Incorrect: Statement 1 is incorrect*
- Statement 1 correctly describes the cardinal clinical and histopathological features of Pemphigus vulgaris
Endoscopic Skull Base Surgery Indian Medical PG Question 8: What does a bluish-purple discoloration behind the mastoid indicate?
- A. Battle sign (Correct Answer)
- B. Bezold abscess
- C. Both A and B
- D. None of the options
Endoscopic Skull Base Surgery Explanation: ***Battle sign***
- A **bluish-purple discoloration behind the mastoid** (postauricular ecchymosis) is a classic sign of a **basilar skull fracture**, particularly involving the middle cranial fossa.
- This bruising is caused by the extravasation of blood from the fracture site into the soft tissues over the mastoid process.
*Bezold abscess*
- A Bezold abscess is a rare complication of **mastoiditis**, where infection erodes through the mastoid tip and spreads to the soft tissues of the neck.
- It presents as a **painful swelling in the neck** and is typically not associated with a bluish-purple discoloration *behind* the mastoid unless there is significant necrotic tissue or a secondary hematoma, which is not the primary feature.
*Both A and B*
- These conditions represent distinct pathologies, one related to **trauma (Battle sign)** and the other to **infection (Bezold abscess)**.
- While both involve the mastoid region, their underlying causes and typical presentations are different.
*None of the options*
- The image directly displays the characteristic bruising of a Battle sign, making this option incorrect.
- The appearance is highly indicative of a specific medical condition.
Endoscopic Skull Base Surgery Indian Medical PG Question 9: FISCH classification is used for-
- A. Juvenile nasopharyngeal angiofibroma
- B. Nasopharyngeal carcinoma
- C. Vestibular schwannoma
- D. Glomus tumor (Correct Answer)
Endoscopic Skull Base Surgery Explanation: ***Glomus tumor***
- The **FISCH classification** is a surgical staging system used to classify **glomus tumors** based on their extent and involvement of surrounding structures.
- This classification helps guide surgical management and predict procedural outcomes for these highly vascular tumors.
*Juvenile nasopharyngeal angiofibroma*
- **Radkowski's classification**, or **Andrews' classification**, are commonly used for staging **juvenile nasopharyngeal angiofibroma**, not FISCH.
- These classifications categorize tumors based on their extension into the nasal cavity, paranasal sinuses, orbit, or intracranial space.
*Nasopharyngeal ca*
- The staging of **nasopharyngeal carcinoma** is typically based on the **AJCC (American Joint Committee on Cancer) TNM classification system**.
- This system assesses the **tumor (T)** size and local extension, **node (N)** involvement, and **metastasis (M)**.
*Vestibular schwannoma*
- **Vestibular schwannomas** are usually staged using systems that describe their size and extension into the **cerebellopontine angle** and brainstem, such as the **Koos grade**.
- The FISCH classification is specifically for **glomus tumors** of the temporal bone and is not applicable to vestibular schwannomas.
Endoscopic Skull Base Surgery Indian Medical PG Question 10: Dohlman surgery in Zenker's diverticulum is:-
- A. Endoscopic electrocautery technique (Correct Answer)
- B. Endoscopic suturing of pouch
- C. Laser division of pouch
- D. Endoscopic stapling of septum
Endoscopic Skull Base Surgery Explanation: ***Endoscopic electrocautery technique***
- The **Dohlman procedure** (Dohlman-Mattsson procedure, 1960) is an **endoscopic electrosurgical technique** that uses **diathermy/electrocautery** to divide the cricopharyngeal muscle (the septum between the esophagus and the diverticulum).
- This method creates a common cavity between the esophagus and the diverticulum, allowing food to pass freely and preventing pooling.
- It is one of the **classic endoscopic approaches** for treating Zenker's diverticulum and remains widely used.
*Endoscopic suturing of pouch*
- Endoscopic suturing is not the primary technique for the Dohlman procedure.
- The goal is to **divide the septum**, not to suture or reduce the pouch itself.
*Laser division of pouch*
- **Laser division** of the cricopharyngeal muscle is another endoscopic approach, often called **endoscopic laser diverticulostomy**.
- While effective, this is a **different technique** from the Dohlman procedure, which specifically uses electrocautery.
*Endoscopic stapling of septum*
- **Endoscopic stapling** (using an endoscopic stapler to divide the septum) is associated with the **Collard-Peracchia technique** or endoscopic stapling diverticulostomy.
- While this is a modern and effective approach, it is **not the Dohlman procedure**, which historically and traditionally refers to the electrocautery technique.
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