Total Body Irradiation — MCQs
Precisely directed high dose radiation is used in which of the following therapies?
The standard radiation therapy dose for consolidation treatment in early-stage Hodgkin lymphoma is:
Which of the following reflects a key health initiative promoted by the Colombo Plan?
Most common endocrine complication of intracranial radiotherapy is
Radiotherapy has the most significant therapeutic role in:
Late effects of radiation therapy include:
Which of the following statements regarding thermal injury is correct?
A 65-year-old presents with chronic knee pain, varus deformity, and medial joint space narrowing. BMI is 32. Best treatment option?
A 28-year-old male patient presents with colicky abdominal pain along with vomiting. X-ray abdomen shows:
What is the management of osteoradionecrosis?
Total Body Irradiation Indian Medical PG Practice Questions and MCQs
Question 1: Precisely directed high dose radiation is used in which of the following therapies?
- A. EBRT
- B. IMRT
- C. Brachytherapy
- D. Stereotactic radiosurgery (Correct Answer)
Explanation: ***Stereotactic radiosurgery*** - **Stereotactic radiosurgery (SRS)** is a highly precise radiation therapy that uses focused, high-dose radiation beams to target small tumors or abnormalities with **sub-millimeter accuracy**. - It delivers **very high doses per fraction** (typically 15-24 Gy in a single session) using stereotactic guidance systems. - Commonly used for **brain metastases, AVMs, acoustic neuromas**, and other small intracranial targets. *IMRT* - **Intensity-modulated radiation therapy (IMRT)** is an advanced form of 3D-conformal radiation therapy that modulates beam intensity to conform to tumor shape. - While IMRT is precise, it uses **conventional fractionation** (1.8-2 Gy per fraction over many treatments), not the high-dose approach of SRS. *EBRT* - **External beam radiation therapy (EBRT)** is a general term for radiation delivered from outside the body. - It encompasses various techniques but *does not specifically indicate the **stereotactic precision and high-dose per fraction** characteristic of SRS*. *Brachytherapy* - **Brachytherapy** involves placing radioactive sources **directly inside or next to the tumor**. - While it delivers high doses locally, it is not "precisely directed high-dose radiation" from external beams like SRS.
Question 2: The standard radiation therapy dose for consolidation treatment in early-stage Hodgkin lymphoma is:
- A. Moderate dose: 30-40 Gy
- B. Standard dose: 20-30 Gy (Correct Answer)
- C. High dose: 50-60 Gy
- D. Intermediate dose: 40-50 Gy
Explanation: **Standard dose: 20-30 Gy** - For **early-stage Hodgkin lymphoma**, a dose range of **20-30 Gy** is considered standard for **consolidation radiotherapy** following chemotherapy. - This dose balances efficacy in eradicating residual microscopic disease with minimizing **long-term toxicity**. *Moderate dose: 30-40 Gy* - This dose range is typically used in situations requiring **higher local control** where the risk of recurrence is elevated, or for certain **bulky disease** settings. - It exceeds the standard recommendation for **routine consolidation** in early-stage disease due to potential for increased side effects. *High dose: 50-60 Gy* - Doses in this range are usually reserved for **definitive radiation therapy** in primary malignancy treatment or for **palliation of symptomatic bulky disease**, not early-stage consolidation. - Such high doses would significantly increase the risk of **secondary malignancies** and other late toxicities in Hodgkin lymphoma. *Intermediate dose: 40-50 Gy* - This dose range is generally not a recognized standard for **early-stage Hodgkin lymphoma consolidation**. - It falls between standard consolidation and definitive treatment doses, potentially offering **unjustified toxicity** without a clear benefit over the lower standard dose.
Question 3: Which of the following reflects a key health initiative promoted by the Colombo Plan?
- A. Promoting cobalt therapy initiatives for cancer treatment
- B. Strengthening human resources for healthcare (Correct Answer)
- C. Establishing treatment facilities for various diseases
- D. Support for diagnostic imaging technology in healthcare
Explanation: ***Strengthening human resources for healthcare*** - The Colombo Plan primarily focused on **technical cooperation** and **human resource development** in developing member countries - This included providing **fellowships** for training doctors, nurses, and other health professionals, and sending experts to assist in health education and infrastructure - The core mandate was **capacity building** through training and expertise, enabling countries to develop sustainable healthcare systems *Establishing treatment facilities for various diseases* - While improved health outcomes often lead to better facilities, the core mandate of the Colombo Plan was **capacity building** rather than direct construction or funding of treatment centers - The focus was on equipping local professionals to manage and develop their own health systems *Promoting cobalt therapy initiatives for cancer treatment* - While cancer treatment is crucial, cobalt therapy initiatives were not a primary or defining feature of the Colombo Plan's health strategy - The plan emphasized a broader approach to **healthcare infrastructure** and **human capital development** across multiple health domains *Support for diagnostic imaging technology in healthcare* - Support for specific technologies like diagnostic imaging was less prominent than the overarching goal of **human resource development** - The plan's emphasis was on foundational **training and expertise** across various health sectors rather than targeted equipment provision
Question 4: Most common endocrine complication of intracranial radiotherapy is
- A. TSH deficiency
- B. Addison's disease
- C. Cushing's syndrome
- D. Growth hormone deficiency (Correct Answer)
Explanation: **Growth hormone deficiency** - **Growth hormone (GH)-producing cells** in the pituitary are highly sensitive to radiation, making GH deficiency the earliest and most common endocrine complication after intracranial radiotherapy [1]. - This deficiency can manifest years after radiation and cause growth failure in children and reduced bone mineral density or fatigue in adults. *TSH deficiency* - While **TSH deficiency** (central hypothyroidism) can occur, it typically manifests later than GH deficiency and is less common [1]. - It indicates damage to the **thyrotrophs** of the pituitary, which are generally more resistant to radiation than somatotrophs. *Addison's disease* - **Addison's disease** is primary adrenal insufficiency, where the adrenal glands fail to produce enough cortisol and aldosterone. It is not caused by intracranial radiotherapy [1]. - Intracranial radiotherapy can lead to **central adrenal insufficiency** due to ACTH deficiency, but not primary Addison's. *Cushing's syndrome* - **Cushing's syndrome** is caused by prolonged exposure to high levels of cortisol, often due to an **ACTH-producing pituitary adenoma** (Cushing's disease) or adrenal tumor [2]. It is not a complication of intracranial radiotherapy itself. - Radiotherapy may be used **to treat** Cushing's disease, but it does not cause the condition.
Question 5: Radiotherapy has the most significant therapeutic role in:
- A. Monoclonal gammopathy
- B. Tuberculosis
- C. Sarcomas (Correct Answer)
- D. Sarcoidosis
Explanation: ***Sarcomas*** - **Radiotherapy** plays a crucial therapeutic role in **sarcomas**, though typically as **adjuvant therapy** combined with surgical resection - Used for **local control** in soft tissue sarcomas, particularly when wide margins cannot be achieved - **Primary radiotherapy** is the treatment of choice for certain radiation-sensitive sarcomas like **Ewing's sarcoma** and in cases of **inoperable tumors** - Essential for reducing **local recurrence rates** in high-grade soft tissue sarcomas - Among the options listed, sarcomas have the **strongest and most established indication** for radiotherapy *Monoclonal gammopathy* - Generally **observation only** for MGUS (Monoclonal Gammopathy of Undetermined Significance) - Radiotherapy used only for **solitary plasmacytoma**, which is a specific localized manifestation - Multiple myeloma (if it progresses) is treated with **chemotherapy** and targeted agents, not radiotherapy as primary treatment *Tuberculosis* - An **infectious disease** caused by *Mycobacterium tuberculosis* - Treated exclusively with **anti-tubercular drug regimens** (RIPE: Rifampicin, Isoniazid, Pyrazinamide, Ethambutol) - Radiotherapy has **no role** in treating infections *Sarcoidosis* - A **systemic inflammatory condition** with non-caseating granulomas - Primary treatment is **corticosteroids** for symptomatic cases - Immunosuppressants used for refractory cases - Radiotherapy has **no role** in inflammatory/granulomatous diseases
Question 6: Late effects of radiation therapy include:
- A. Mucositis, Enteritis, Nausea and vomiting, Pneumonitis
- B. Enteritis, Nausea and vomiting, Pneumonitis, Somatic mutations
- C. Mucositis, Nausea and vomiting, Pneumonitis, Somatic mutations
- D. Mucositis, Enteritis, Pneumonitis, Somatic mutations (Correct Answer)
Explanation: ***Mucositis, Enteritis, Pneumonitis, Somatic mutations*** - **Somatic mutations** leading to **secondary malignancies** are a classic late effect of radiation (occurs years after exposure due to DNA damage) [1] - **Radiation pneumonitis** progressing to **pulmonary fibrosis** is a well-recognized late complication (typically 1-3 months to years post-treatment) [1] - **Chronic radiation enteritis** with fibrosis and vascular damage can occur months to years after abdominal/pelvic radiation [1] - **Chronic mucositis** with fibrosis can persist as a late effect, though mucositis is more commonly acute - This option represents the **most comprehensive list of late effects** among the choices *Mucositis, Enteritis, Nausea and vomiting, Pneumonitis* - **Nausea and vomiting** are predominantly **acute side effects** occurring during or immediately after radiation therapy, not late effects - While mucositis and enteritis can have chronic forms, including nausea/vomiting makes this option incorrect *Enteritis, Nausea and vomiting, Pneumonitis, Somatic mutations* - Incorrectly includes **nausea and vomiting** as a late effect - Though it includes somatic mutations (correct late effect), the presence of an acute symptom invalidates this choice *Mucositis, Nausea and vomiting, Pneumonitis, Somatic mutations* - Incorrectly includes **nausea and vomiting** as a late effect - Omits enteritis, which can manifest as chronic radiation enteritis with fibrosis and strictures **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Central Nervous System Synapse, pp. 437-439.
Question 7: Which of the following statements regarding thermal injury is correct?
- A. In child below 5 years, genitals form 1% of area
- B. Lund-Browder chart is the most accurate method for estimating TBSA in children (Correct Answer)
- C. Rule of nines is more accurate than Lund-Browder chart in children
- D. Burn index is the standard clinical method for assessing burn severity
Explanation: ***Lund-Browder chart is the most accurate method for estimating TBSA in children*** - The Lund-Browder chart is the **most accurate method** for estimating the **total body surface area (TBSA)** affected by burns, especially in children, due to its ability to adjust for age-related body proportion changes. - It assigns different body proportions based on age, making it superior to the Rule of Nines for pediatric patients. - This is the **CORRECT** statement. *Rule of nines is more accurate than Lund-Browder chart in children* - This is **FALSE**. The Rule of Nines is **less accurate in children** because their head and neck comprise a larger percentage of TBSA and their lower limbs a smaller percentage compared to adults. - The Lund-Browder chart is specifically designed to account for age-related differences and is therefore more accurate in pediatric burn assessment. *In child below 5 years, genitals form 1% of area* - While this statement is **technically true**, it is not the **most correct** answer in the context of thermal injury assessment methods. - In both adults and children, the **genitals and perineum** together typically account for **1% of TBSA**. - This is a specific anatomical fact but doesn't address burn assessment methodology, which is the main focus of the question. *Burn index is the standard clinical method for assessing burn severity* - This is **FALSE**. The **Burn Index** is not a commonly used term in standard clinical burn assessment. - Burn severity is assessed by considering both **depth** (superficial, partial-thickness, full-thickness) and **TBSA percentage**, along with other factors like location and patient age, but "Burn Index" is not the standard terminology or method used.
Question 8: A 65-year-old presents with chronic knee pain, varus deformity, and medial joint space narrowing. BMI is 32. Best treatment option?
- A. Arthroscopic Debridement
- B. Unicompartmental Knee Replacement
- C. High Tibial Osteotomy
- D. Total Knee Replacement (Correct Answer)
Explanation: ***Total Knee Replacement*** - This is the most appropriate treatment for a 65-year-old with chronic knee pain, significant **varus deformity**, and **medial joint space narrowing**, indicative of advanced **osteoarthritis**. - A **high BMI (32)** is also a factor that often points towards the need for total joint replacement when conservative measures have failed, as it contributes to increased stress on the knee. *Arthroscopic Debridement* - This procedure is generally reserved for less severe osteoarthritis symptoms or mechanical symptoms like locking, and it is **not effective** for advanced joint degeneration with significant deformity. - It would provide little to no long-term benefit for the presented severe changes and chronic pain. *Unicompartmental Knee Replacement* - While suitable for isolated medial compartment osteoarthritis, a **varus deformity** indicates damage beyond a single compartment or significant malalignment that might not be fully corrected by a unicompartmental approach. - The chronicity, age, and likely degree of degeneration suggest a more comprehensive solution is needed. *High Tibial Osteotomy* - This procedure is typically performed in younger, more active patients with **varus malalignment** and early to moderate osteoarthritis to shift weight to a healthier compartment. - At 65 years old with chronic pain and advanced joint space narrowing, a **corrective osteotomy** is less likely to provide long-term relief and may delay a more definitive solution.
Question 9: A 28-year-old male patient presents with colicky abdominal pain along with vomiting. X-ray abdomen shows:
- A. Pseudo-obstruction
- B. Cancer colon
- C. Small bowel obstruction (Correct Answer)
- D. Paralytic ileus
Explanation: ***Small bowel obstruction*** - The X-ray image shows multiple **dilated loops of small bowel** with **air-fluid levels** and prominent **valvulae conniventes** (herringbone pattern), which are classic signs of small bowel obstruction. - The clinical presentation of **colicky abdominal pain** and **vomiting** is highly consistent with a small bowel obstruction. *Pseudo-obstruction* - Pseudo-obstruction, or Ogilvie's syndrome, primarily affects the **large bowel**, leading to colonic dilation without a mechanical obstruction. - While it can cause abdominal pain and vomiting, the X-ray findings would typically show marked dilation of the colon rather than predominantly small bowel loops. *Cancer colon* - Colon cancer, if it causes obstruction, typically presents as a **large bowel obstruction**, with colonic dilation proximal to the tumor. - While severe cases could lead to cecal dilation and subsequent small bowel obstruction, the primary radiographic findings would focus on the colon. *Paralytic ileus* - Paralytic ileus, or adynamic ileus, involves generalized bowel dilation (both small and large bowel) due to **impaired peristalsis**, without mechanical obstruction. - Although it causes abdominal pain and vomiting, it usually presents with more continuous, less colicky pain, and the X-ray often shows gas in the colon, which is typically absent or minimal in a complete small bowel obstruction.
Question 10: What is the management of osteoradionecrosis?
- A. Hyperbaric oxygen
- B. Removal of sequestrum
- C. Fluoride application
- D. All of the above (Correct Answer)
Explanation: **Explanation:** Osteoradionecrosis (ORN) is a serious late complication of radiotherapy, most commonly affecting the mandible. It is characterized by bone death due to radiation-induced **hypocellularity, hypovascularity, and hypoxia (Marx’s 3H theory)**, leading to non-healing exposed bone. The management of ORN is multifaceted, involving conservative, medical, and surgical interventions: 1. **Hyperbaric Oxygen (HBO):** This is a cornerstone of treatment. It increases dissolved oxygen levels in tissues, stimulating angiogenesis and fibroblastic activity, which helps reverse the radiation-induced hypoxic state. 2. **Removal of Sequestrum (Sequestrectomy):** Surgical intervention is required to remove necrotic, infected bone (sequestrum) that acts as a nidus for infection and prevents healing. 3. **Fluoride Application:** Preventive and supportive care is vital. Radiation damages salivary glands (xerostomia), increasing the risk of radiation caries. Daily topical fluoride application is essential to maintain dental integrity and prevent odontogenic infections that could trigger or worsen ORN. **Why "All of the above" is correct:** Effective management requires a combination of improving tissue oxygenation (HBO), surgical debridement of dead bone, and strict oral hygiene/caries prevention (Fluoride) to arrest the progression of the disease. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Mandible (due to lower vascularity compared to the maxilla). * **Marx’s Protocol:** Often involves 20–30 sessions of HBO before surgery and 10 sessions after. * **PENTOCLO Protocol:** A newer medical management involving Pentoxifylline, Tocopherol (Vitamin E), and Clodronate. * **Prevention:** All necessary dental extractions should ideally be completed **at least 2–3 weeks before** starting radiotherapy.
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