Paragangliomas — MCQs
In a patient diagnosed with pheochromocytoma, what is the appropriate preoperative pharmacological management to control hypertension before surgery?
A 40-year-old patient presents with lower cranial nerve (CN IX, X, XI) palsies, otitis media, and headache. CT scan reveals a mass in the jugular foramen. What is the most likely diagnosis?
Most of the parotid tumors are managed by:
In which of the following conditions is Stereotactic Radiosurgery primarily indicated?
Which of the following is the earliest and consistent symptom of a glomus tumor?
Gelle's test is done in?
All of the following are true about the hearing aid shown in the figure except:
Which of the following is NOT a component of Trotter's triad associated with nasopharyngeal carcinoma?
Which of the following is not a cause of oropharyngeal carcinoma?
Trismus in carcinoma of the temporal bone occurs due to involvement of:
Paragangliomas Indian Medical PG Practice Questions and MCQs
Question 1: In a patient diagnosed with pheochromocytoma, what is the appropriate preoperative pharmacological management to control hypertension before surgery?
- A. Phenoxybenzamine and propranolol (Correct Answer)
- B. Propranolol
- C. Nitroglycerine
- D. Phentolamine
Explanation: ***Phenoxybenzamine and propranolol*** - **Phenoxybenzamine** (an **irreversible** non-selective **alpha-blocker**) is initiated first to prevent hypertensive crises during surgery by blocking the effects of catecholamines on blood vessels. - **Propranolol** (a **beta-blocker**) is added after adequate alpha-blockade to control **tachycardia** and arrhythmias, as blocking only alpha-receptors can lead to unopposed beta-adrenergic stimulation. *Phentolamine (short-acting alpha blocker)* - While **phentolamine** is an alpha-blocker, it is typically used for **intraoperative management** of hypertensive crises or for short-term control, not as the primary preoperative preparation. - It is a **reversible** blocker and does not provide the sustained, robust alpha-blockade required for safe preoperative management of pheochromocytoma. *Propranolol (beta-blocker)* - **Beta-blockers** alone should **never be started first** in pheochromocytoma because blocking beta-2 receptors (which mediate vasodilation) in the presence of high circulating catecholamines can lead to **unopposed alpha-adrenergic vasoconstriction**, causing a dangerous hypertensive crisis. - It is only added after adequate alpha-blockade has been achieved to manage **tachycardia**. *Nitroglycerine (vasodilator)* - **Nitroglycerine** is primarily a **venodilator** and is used to relieve angina or manage acute hypertensive emergencies, not for the chronic preoperative management of pheochromocytoma. - It does not address the underlying pathophysiology of excessive catecholamine release and can lead to reflex **tachycardia**.
Question 2: A 40-year-old patient presents with lower cranial nerve (CN IX, X, XI) palsies, otitis media, and headache. CT scan reveals a mass in the jugular foramen. What is the most likely diagnosis?
- A. Glomus jugulare (Correct Answer)
- B. Metastasis
- C. Schwannoma
- D. Meningioma
Explanation: ***Glomus jugulare*** - A **glomus jugulare tumor** (paraganglioma) - It arises in the **jugular bulb** and typically presents with a pulsatile mass, **cranial nerve palsies (IX, X, XI)**, and sometimes symptoms related to middle ear involvement like **otitis media** or conductive hearing loss, along with headache due to mass effect. *Metastasis* - While metastases can cause cranial nerve palsies and present as masses, they are generally not isolated to the **jugular foramen** with the specific constellation of symptoms including **otitis media** unless primary tumor is in the ear and also the history is acute and rapidly progressive - The presentation is more suggestive of a **primary lesion** arising from the structures within or immediately adjacent to the jugular foramen rather than a metastatic deposit. *Schwannoma* - **Schwannomas** (e.g., of CN IX, X, or XI) can occur in the jugular foramen and cause similar cranial nerve palsies. - However, they are less commonly associated with features like **otitis media** or a pulsatile character, which are more specific to a glomus tumor. They are also slower growing *Meningioma* - **Meningiomas** can involve the skull base, including the jugular foramen, leading to cranial neuropathies and headache. - They typically originate from the **dura mater** and generally do not cause otitis media as a direct symptom unless there's extensive local invasion into the middle ear, which is less characteristic than in glomus tumors.
Question 3: Most of the parotid tumors are managed by:
- A. Total parotidectomy
- B. Radical parotidectomy & Neck dissection
- C. Superficial parotidectomy (Correct Answer)
- D. Radical parotidectomy
Explanation: ***Superficial parotidectomy*** - The vast majority of parotid tumors, especially **benign tumors** like **pleomorphic adenomas**, arise in the **superficial lobe** of the parotid gland. - This procedure removes the superficial lobe while preserving the **facial nerve**, which is crucial for facial expression. - **Most common procedure** for parotid tumors since 80-85% are benign and superficial. *Total parotidectomy* - This procedure removes both the **superficial and deep lobes** of the parotid gland. - Typically reserved for tumors affecting the **deep lobe** or those with extensive involvement. - Less common than superficial parotidectomy as deep lobe tumors are uncommon. *Radical parotidectomy & Neck dissection* - **Radical parotidectomy** involves removing the entire parotid gland, often sacrificing the **facial nerve**, and a **neck dissection** removes lymph nodes in the neck. - This aggressive approach is reserved for **malignant tumors** with known or suspected **nodal metastasis**. - Represents a small percentage of parotid tumor cases. *Radical parotidectomy* - This procedure involves removal of the entire parotid gland, often including the **facial nerve** or its branches, due to tumor infiltration. - Indicated for **high-grade malignant tumors** with nerve involvement but without overt nodal metastasis. - Less common than benign superficial tumors requiring only superficial parotidectomy.
Question 4: In which of the following conditions is Stereotactic Radiosurgery primarily indicated?
- A. Ependymoma
- B. Arteriovenous malformation of the brain (Correct Answer)
- C. Medulloblastoma of the spinal cord
- D. Glioblastoma multiforme
Explanation: ***Arteriovenous malformation of the brain*** - **Stereotactic Radiosurgery (SRS)** is a highly effective treatment for brain AVMs, particularly those that are **small to medium-sized** and located in eloquent brain regions. - SRS delivers a **highly focused dose of radiation** directly to the AVM, causing the abnormal blood vessels to gradually close off over time, reducing the risk of hemorrhage. *Medulloblastoma of the spinal cord* - Medulloblastoma is a **highly aggressive malignant brain tumor** that often metastasizes to the spinal cord via cerebrospinal fluid. - Treatment for spinal medulloblastoma typically involves **cranio-spinal irradiation with chemotherapy**, and SRS is generally not the primary treatment modality for diffuse spinal disease. *Ependymoma* - Ependymomas are tumors arising from the **ependymal cells** lining the ventricles and spinal cord. - While surgery is the primary treatment, radiotherapy, including **conventional fractionated external beam radiation**, is often used as adjuvant therapy, but SRS is less commonly the sole primary indication. *Glioblastoma multiforme* - Glioblastoma multiforme (GBM) is the **most aggressive primary brain tumor** and is typically treated with **maximal surgical resection followed by concurrent chemoradiotherapy**. - While SRS may be used in carefully selected cases for **recurrent GBM** or as a boost in primary treatment, it is not the primary solitary indication for initial management.
Question 5: Which of the following is the earliest and consistent symptom of a glomus tumor?
- A. Hoarseness
- B. Tinnitus (Correct Answer)
- C. Otorrhea
- D. Dysphagia
Explanation: **Tinnitus** - As glomus tumors are typically **vascular**, the earliest and most consistent symptom is often **pulsatile tinnitus**, a sound synchronous with the patient's heartbeat. - This symptom arises from blood flow through the tumor, which is usually located in the **middle ear** or **jugular bulb**. *Hoarseness* - Hoarseness is a potential symptom if the tumor extends to involve the **vagus nerve (CN X)**, but this typically occurs in **later stages** as the tumor grows significantly. - It is not considered an **early or consistent** symptom as it requires more extensive disease. *Otorrhea* - Otorrhea, or ear discharge, may occur if the tumor erodes through the **tympanic membrane** or causes secondary infection. - This is a symptom of **advanced disease** or complications, not an early presentation. *Dysphagia* - Dysphagia, or difficulty swallowing, suggests involvement of **cranial nerves IX, X, or XI**, which is associated with large, advanced tumors. - It is a **late symptom** and indicates significant tumor extension.
Question 6: Gelle's test is done in?
- A. Traumatic deafness
- B. Senile deafness
- C. Otosclerosis (Correct Answer)
- D. Serous otitis media
Explanation: ***Otosclerosis*** - **Gelle's test** is primarily used to diagnose **otosclerosis**, a condition causing **conductive hearing loss** due to abnormal bone growth in the middle ear. - The test assesses changes in **bone conduction hearing** in response to alterations in external ear canal pressure, which is characteristic of a fixed stapes footplate in otosclerosis. *Traumatic deafness* - **Traumatic deafness** can result from direct injury to the ear, but **Gelle's test** is not a primary diagnostic tool for this type of hearing loss. - Diagnosis typically involves evaluating the **nature and extent of the trauma** and other audiometric tests. *Senile deafness* - Also known as **presbycusis**, **senile deafness** is a **sensorineural hearing loss** associated with aging. - **Gelle's test** assesses changes in bone conduction with pressure, making it less relevant for diagnosing age-related nerve damage. *Serous otitis media* - **Serous otitis media** involves fluid accumulation in the middle ear, leading to **conductive hearing loss**. - While it causes conductive hearing loss, **Gelle's test** is not the definitive diagnostic test; **tympanometry** and **audiometry** are more commonly used.
Question 7: All of the following are true about the hearing aid shown in the figure except:
- A. Bypasses the external and middle ear
- B. Osseointegration of titanium fixture takes 2-6 months
- C. Indicated in patients with unilateral profound hearing loss (Correct Answer)
- D. Disadvantage of multi-stage surgery
Explanation: ***Indicated in patients with unilateral profound hearing loss*** - While **bone conduction hearing implants** can be used for **unilateral hearing loss**, they are typically indicated for **single-sided deafness with normal hearing in the contralateral ear** to provide sound awareness to the deaf side. However, in cases of **profound unilateral hearing loss, cochlear implantation** is often the preferred and more effective intervention for direct sound perception. *Bypasses the external and middle ear* - This statement is true; the device shown is a **bone conduction hearing system** (like BAHA), which transmits sound vibrations directly to the inner ear via the bone, thus **bypassing problems in the external auditory canal and middle ear**. - It is effective for **conductive or mixed hearing loss** where the inner ear function is relatively preserved. *Osseointegration of titanium fixture takes 2-6 months* - This statement is true; **osseointegration** is the biological process where the titanium implant fuses with the bone, which typically takes **2 to 6 months** before the external sound processor can be safely attached. - This fusion is crucial for stable and effective **bone sound conduction**. *Disadvantage of multi-stage surgery* - This statement is true; traditional bone conduction implants often require a **two-stage surgical procedure**: one for implanting the fixture and another for attaching the abutment after successful osseointegration. - This involves **multiple clinic visits, recovery periods**, and potential complications associated with two separate surgeries.
Question 8: Which of the following is NOT a component of Trotter's triad associated with nasopharyngeal carcinoma?
- A. Palatal paralysis
- B. Trigeminal Neuralgia
- C. Conduction deafness
- D. Sensorineural deafness (Correct Answer)
Explanation: ***Sensorineural deafness*** - **Trotter's triad** specifically refers to unilateral **painless conductive hearing loss**, **trigeminal neuralgia**, and **palatal paralysis** in the context of nasopharyngeal carcinoma. - Sensorineural deafness is not typically part of this classic triad as the tumor's direct pressure tends to affect the Eustachian tube leading to conductive hearing loss. *Palatal paralysis* - This is a key component of **Trotter's triad**, resulting from the tumor's invasion of the **IX (glossopharyngeal)** and **X (vagus)** cranial nerves, which innervate the soft palate. - It leads to **dysphagia** and **dysarthria**, often presenting as an early symptom. *Trigeminal Neuralgia* - This refers to **unilateral facial pain** due to involvement of the **V (trigeminal)** cranial nerve, which is a core symptom of **Trotter's triad**. - The tumor's extension can cause compression or infiltration of the nerve, leading to sharp, shooting pains. *Conduction deafness* - This is a cardinal sign of **Trotter's triad** and is caused by the nasopharyngeal tumor obstructing the **Eustachian tube**. - Obstruction leads to fluid accumulation in the middle ear, resulting in **painless unilateral conductive hearing loss**.
Question 9: Which of the following is not a cause of oropharyngeal carcinoma?
- A. Occupational exposure to hydrochloric acid (Correct Answer)
- B. Smoking
- C. Human Papilloma Virus infection
- D. Occupational exposure to isopropyl oil
Explanation: **Explanation:** The primary risk factors for oropharyngeal carcinoma (OPC) are lifestyle-related and viral, rather than chemical or industrial. **1. Why Option A is the Correct Answer:** Occupational exposure to **hydrochloric acid (HCl)** is primarily associated with dental erosion and irritation of the upper respiratory tract, but it is **not** a recognized carcinogen for the oropharynx. In contrast, exposure to strong inorganic acid mists (like sulfuric acid) is linked specifically to **laryngeal cancer**, not oropharyngeal cancer. **2. Analysis of Other Options:** * **Smoking (Option B):** Tobacco use is a classic risk factor. Carcinogens like nitrosamines and polycyclic aromatic hydrocarbons cause field cancerization, leading to squamous cell carcinoma (SCC) of the entire aerodigestive tract. * **Human Papilloma Virus (Option C):** HPV (specifically **Type 16**) is now the leading cause of oropharyngeal cancer globally, especially involving the palatine tonsils and base of tongue. HPV-positive tumors have a better prognosis than tobacco-related ones. * **Isopropyl Oil (Option D):** Occupational exposure to the manufacture of isopropyl alcohol (specifically the "strong acid process" involving isopropyl oil) is a documented risk factor for cancers of the **paranasal sinuses and the oropharynx**. **Clinical Pearls for NEET-PG:** * **Most Common Site:** The **palatine tonsil** is the most common site for oropharyngeal SCC. * **HPV Marker:** **p16** immunohistochemistry is used as a surrogate marker for HPV-associated oropharyngeal cancer. * **Plummer-Vinson Syndrome:** Associated with post-cricoid (hypopharyngeal) carcinoma, not primarily oropharyngeal. * **Diet:** Deficiencies in Vitamin A and C are also implicated in the development of oral and pharyngeal malignancies.
Question 10: Trismus in carcinoma of the temporal bone occurs due to involvement of:
- A. Dura
- B. Temporomandibular joint (Correct Answer)
- C. Mastoid
- D. Eustachian tube
Explanation: **Explanation:** In the context of temporal bone carcinoma (most commonly Squamous Cell Carcinoma), **Trismus** (inability to open the mouth) is a significant clinical sign indicating **anterior extension** of the tumor. **Why the Temporomandibular Joint (TMJ) is correct:** The anterior wall of the external auditory canal (EAC) is in direct anatomical proximity to the glenoid fossa and the TMJ. When a malignancy breaches the anterior bony or cartilaginous wall of the EAC, it invades the TMJ and the associated pterygoid muscles. This infiltration leads to pain and mechanical restriction of mandibular movement, resulting in trismus. This finding usually signifies an advanced stage (T3 or T4) and a poorer prognosis. **Why other options are incorrect:** * **Dura:** Involvement of the dura (superior extension through the tegmen) leads to neurological complications, CSF otorrhea, or meningitis, but does not mechanically restrict jaw movement. * **Mastoid:** Posterior extension into the mastoid air cells causes retroauricular pain and swelling, but the mastoid process does not interface with the muscles of mastication. * **Eustachian tube:** While the tumor can involve the Eustachian tube leading to middle ear effusion and conductive hearing loss, it does not cause the muscular or joint fixation required for trismus. **High-Yield NEET-PG Pearls:** * **Most common site:** The External Auditory Canal is the most common site for temporal bone malignancy. * **Most common histology:** Squamous Cell Carcinoma. * **Clinical Red Flag:** Chronic otorrhea that becomes **blood-stained** or is associated with **deep-seated ear pain** should always be suspicious of malignancy. * **Staging:** Facial nerve palsy and Trismus are indicators of advanced disease (T4 in the modified Pittsburgh staging system).
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