Surgical Oncology Principles Practice Questions

Q: What is the most common anterior mediastinal tumor?

Thymoma. ***Thymoma*** - **Thymomas** are the most common primary tumor of the **anterior mediastinum** in adults. - They originate from the epithelial cells of the **thymus gland**, which is located in the anterior mediastinum. *Bronchogenic cyst* - **Bronchogenic cysts** are typically found in the **middle mediastinum**, although they can occasionally occur in the anterior or posterior mediastinum. - They are congenital anomalies resulting from abnormal budding of the **tracheobronchial tree**. *Neurofibroma* - **Neurofibromas** are nerve sheath tumors that typically occur in the **posterior mediastinum**, arising from spinal nerves. - They are often associated with **neurofibromatosis type 1**. *Pericardial cyst* - **Pericardial cysts** are benign, fluid-filled sacs most commonly found in the **middle mediastinum**, specifically in the cardiophrenic angle. - They are usually asymptomatic and are often discovered incidentally.

Q: Most common presentation of abdominal desmoid tumor is?

Abdominal mass. ***Abdominal mass*** - Desmoid tumors are **non-metastasizing but locally invasive fibroblastic neoplasms** that most commonly present as a palpable abdominal mass. - This is the **most characteristic finding** on physical examination, though patients may be asymptomatic or have accompanying symptoms. - The mass is typically **firm, fixed, and may be painless** in early stages. *Fever* - Fever is generally **not a primary symptom** of desmoid tumors, as they are benign and do not typically cause systemic inflammation or infection. - If fever is present, it would suggest an **alternative diagnosis** or a complication such as infection or tumor necrosis, which is rare. *Urinary retention* - Urinary retention could occur if a desmoid tumor grows large enough to **compress the bladder or ureters**, but this is not the most common initial presentation. - This symptom would represent a **later-stage complication** rather than the typical first sign of the tumor. *Abdominal pain* - Abdominal pain is a **very common presenting symptom** of abdominal desmoid tumors, often accompanying or even preceding detection of the mass. - However, the most characteristic and consistent finding is the **palpable abdominal mass itself**, which is present in the majority of cases at presentation. - Pain may result from mass effect, infiltration of surrounding structures, or nerve involvement.

Q: Which of the following cancers is sentinel lymph node biopsy commonly used to evaluate?

All of the options. ***All of the options*** - **Sentinel lymph node biopsy (SLNB)** is a widely accepted and practiced technique for staging and guiding treatment in **melanoma**, **breast cancer**, and **vulvar cancer**. - Its utility lies in identifying whether cancer cells have spread to the first draining lymph node, thus indicating regional spread and the need for further intervention. **Breast cancer:** - **SLNB** is the standard of care for staging the axilla in early-stage **breast cancer**, replacing axillary lymph node dissection in many cases. - It helps determine the need for adjuvant therapy and guides patient prognosis. - **SLNB has the highest level of evidence** and is most commonly performed in breast cancer worldwide. **Melanoma:** - For patients with **melanoma** of intermediate thickness (>1 mm or 0.76-1 mm with ulceration), **SLNB** is crucial for identifying occult nodal metastasis. - Positive SLNB results may lead to consideration of complete lymph node dissection and adjuvant systemic therapy. - **SLNB is part of standard staging protocols** for melanoma. **Vulvar cancer:** - **SLNB** is increasingly used in early-stage **vulvar cancer** to assess groin lymph node involvement, especially in unifocal lesions <4 cm. - This technique can significantly reduce the morbidity associated with radical inguinal lymphadenectomy while providing accurate prognostic information. - **SLNB has become the standard approach** for clinically node-negative early vulvar cancer.

Q: Sentinel lymph node biopsy is used for?

Melanoma. ***Melanoma*** - Sentinel lymph node biopsy is a standard staging procedure for **intermediate-thickness (Breslow depth >0.8 mm)** or **ulcerated melanomas** to detect microscopic lymphatic metastatic disease. - It helps guide adjuvant therapy and predict prognosis in patients with no clinically evident nodal involvement. *Squamous cell carcinoma* - Sentinel lymph node biopsy is generally **not indicated** for squamous cell carcinoma unless it has **high-risk features** (e.g., perineural invasion, large size, poor differentiation, recurrence) or is located in certain high-risk anatomic sites, and even then, its role is less established than in melanoma. - Lymphadenectomy is more common for clinically positive nodes. *Thyroid carcinoma* - Sentinel lymph node biopsy is **not routinely performed** for thyroid carcinoma. - The detection of metastases typically relies on **preoperative ultrasound** of the neck and **fine-needle aspiration (FNA)** of suspicious nodes, followed by therapeutic neck dissection if indicated. *Basal cell carcinoma* - Basal cell carcinoma **rarely metastasizes** to regional lymph nodes, making sentinel lymph node biopsy **unnecessary** in almost all cases. - Local excision with clear margins is usually curative.

Q: What does the acronym NSABP represent in the context of cancer research?

National Surgical Adjuvant Breast and Bowel Project. ***National surgical adjuvant for breast and bowel project*** - **NSABP** stands for **National Surgical Adjuvant Breast and Bowel Project**. - It is a prominent research organization focused on conducting clinical trials for the prevention and treatment of breast and colorectal cancer. *National surgical adjuvant for breast project* - This option is incomplete as it omits the "bowel" component of the organization's focus. - The NSABP's research scope extends beyond just breast cancer to include **colorectal cancer**. *National surgical adjuvant for brain and breast* - This option incorrectly includes "brain" and omits "bowel" from the acronym. - The NSABP's primary research areas are **breast and bowel (colorectal) cancers**, not brain cancer. *National surgical adjuvant for bowel and brain* - This option incorrectly includes "brain" and omits "breast" from the acronym. - The NSABP is known for its extensive work in both **breast and colorectal cancer research**.

Q: A 10 cm tumor is found on the anterior surface of the thigh. What is the most appropriate procedure to obtain a diagnosis?

Incision biopsy. ***Incision biopsy*** - An **incision biopsy** is most appropriate for a large tumor (10 cm) to obtain a tissue diagnosis without performing a potentially morbid or disfiguring complete excision upfront. - It involves removing a representative section of the tumor for histopathological analysis, providing adequate tissue for diagnosis, grading, and subtyping. - This allows definitive treatment planning based on confirmed histopathology. *Excision biopsy* - **Excision biopsy** is generally reserved for smaller tumors (typically <3-5 cm) that can be completely resected with acceptable cosmetic and functional outcomes. - Excision of a 10 cm tumor on the thigh would be a significant surgical procedure, potentially causing substantial morbidity, without a prior definitive diagnosis. - Could compromise subsequent definitive surgery if margins are inadequate. *FNAC* - **FNAC (Fine Needle Aspiration Cytology)** provides only cytological diagnosis, which is insufficient for definitive diagnosis, grading, and subtyping of soft tissue tumors, especially sarcomas. - It misses crucial architectural features and tissue patterns needed for accurate classification. - May yield inadequate or non-diagnostic samples from large heterogeneous tumors. *USG* - **USG (Ultrasound)** is an imaging modality, not a tissue diagnosis procedure. - While useful for characterizing mass features (size, location, vascularity, solid vs cystic), it cannot provide histopathological diagnosis. - The question specifically asks for a procedure to "obtain a diagnosis," which requires tissue sampling for microscopic examination.

Q: Which is the most reliable diagnostic method for staging esophageal cancer?

Endoscopic ultrasound. ***Endoscopic ultrasound*** - **Endoscopic ultrasound (EUS)** provides the most accurate and reliable local staging of esophageal cancer by visualizing the depth of tumor invasion into the esophageal wall and assessing regional lymph node involvement. - Its high-frequency ultrasound transducer allows for detailed imaging of the esophageal wall layers and surrounding structures, crucial for determining T and N stages. *MRI* - While MRI can be useful for assessing **distant metastases** and involvement of adjacent organs, it is generally less effective than EUS for determining the precise depth of local esophageal wall invasion. - Its role is more prominent in later stages or when assessing response to neoadjuvant therapy rather than primary local staging. *CT scan* - A **CT scan** is excellent for detecting **distant metastases** and assessing the general extent of the disease, including involvement of surrounding structures and distant lymph nodes. - However, its resolution is insufficient to accurately determine the exact depth of tumor invasion within the esophageal wall, making it less reliable for precise T staging than EUS. *Thoracoscopy* - **Thoracoscopy** is an invasive surgical procedure primarily used for direct visualization and biopsy of suspicious lesions in the chest cavity, or for mediastinal lymph node staging, particularly when other methods are inconclusive. - It is not considered a primary diagnostic method for initial staging of esophageal cancer due to its invasiveness and inability to assess all aspects of local and regional spread as comprehensively as EUS.

Q: For which type of carcinoma is the Nigro protocol primarily used?

Anal. ***Correct: Anal carcinoma*** The **Nigro protocol** is the landmark chemoradiation regimen specifically developed for **anal squamous cell carcinoma**. Introduced by Norman Nigro in 1974, it consists of: - **Concurrent chemotherapy** (5-Fluorouracil + Mitomycin C) - **External beam radiotherapy** This protocol revolutionized anal cancer treatment by achieving complete pathological response in the majority of cases, making it the **standard of care** and avoiding the need for abdominoperineal resection (APR) in most patients. It preserves anal sphincter function and has excellent outcomes with 5-year survival rates exceeding 70%. *Incorrect: Colon carcinoma* - Colon cancer is primarily treated with **surgical resection** (hemicolectomy) followed by adjuvant chemotherapy (FOLFOX) in advanced stages - The Nigro protocol is not used for colonic malignancies *Incorrect: Hepatocellular carcinoma* - HCC treatment includes **hepatic resection**, liver transplantation, radiofrequency ablation, or systemic therapy (sorafenib, lenvatinib) - Chemoradiation protocols like Nigro are not the standard approach *Incorrect: Pancreatic carcinoma* - Pancreatic cancer is treated with **Whipple procedure** (pancreaticoduodenectomy) for resectable tumors or chemotherapy regimens like FOLFIRINOX or gemcitabine-based therapy - The Nigro protocol has no role in pancreatic malignancy management

Q: Biopsy of a clinically suspicious lesion is negative. The most appropriate treatment is

Repeat the biopsy for further evaluation.. ***Repeat the biopsy for further evaluation.*** - A **clinically suspicious lesion** with a negative biopsy result warrants a repeat biopsy because a **false negative** is possible, especially if the initial sample was inadequate or not representative. - The principle "**never let the sun set on a clinically suspicious lesion**" applies here - clinical suspicion should override a negative biopsy result. - Repeating the procedure ensures accurate diagnosis, which is crucial for lesions with **malignant potential**. *Monitor the patient closely for twelve months.* - This approach is too **conservative** for a clinically suspicious lesion with a negative biopsy, as a malignancy could progress significantly within a year. - Waiting this long without a definitive diagnosis carries an **unacceptable risk** of delayed treatment for a potential cancer. *Monitor the patient closely for three months.* - While more proactive than waiting a year, **three months** is still too long for a clinically suspicious lesion if the biopsy result is unreliable. - Early detection and diagnosis are paramount for better outcomes in potentially **malignant lesions**. *Reassure the patient that the lesion is benign.* - This is **inappropriate** as it accepts the false negative biopsy result at face value and dismisses the clinical suspicion. - **Clinical judgment** should take precedence over a negative biopsy when a lesion remains suspicious. - This approach could lead to **catastrophic delays** in diagnosing malignancy.

Q: What finding during surgery can change the staging of a tumor from Stage I to Stage II in a patient with a history of lung cancer?

Positive hilar/peribronchial lymph nodes. ***Positive bronchial lymph nodes*** - The presence of **positive bronchial lymph nodes** (N1) indicates regional lymph node involvement, necessitating an upgrade to Stage II from Stage I [1]. - This finding is significant in lung cancer staging, suggesting metastasis beyond the primary tumor. *Tumor at the carina* - A tumor at the **carina** may imply local invasion but does not specifically relate to lymph node involvement for upgrading the stage. - This would indicate a more advanced tumor stage only if it invaded adjacent structures directly. *Involvement of the chest wall* - Chest wall involvement typically refers to **direct extension of the tumor** and might upgrade the stage to III, not II. - The initial staging focused on **nodal involvement**, which is not indicated in this case. *Small cell histology* - Small cell carcinoma, while aggressive and often systemic, does not correspond with this staging system based on **N classification**. - It also usually presents with different clinical features and patterns compared to non-small cell lung cancers. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 725.

Question 1

What is the most common anterior mediastinal tumor?

Accepted Answer

Thymoma

Answer

Bronchogenic cyst

Answer

Neurofibroma

Answer

Pericardial cyst

Question 2

Most common presentation of abdominal desmoid tumor is?

Accepted Answer

Abdominal mass

Answer

Fever

Answer

Urinary retention

Answer

Abdominal pain

Question 3

Which of the following cancers is sentinel lymph node biopsy commonly used to evaluate?

Accepted Answer

All of the options

Answer

Breast cancer

Answer

Melanoma

Answer

Vulvar cancer

Question 4

Sentinel lymph node biopsy is used for?

Accepted Answer

Melanoma

Answer

Thyroid carcinoma

Answer

Squamous cell carcinoma

Answer

Basal cell carcinoma

Question 5

What does the acronym NSABP represent in the context of cancer research?

Accepted Answer

National Surgical Adjuvant Breast and Bowel Project

Answer

National surgical adjuvant for brain and breast

Answer

National surgical adjuvant for bowel and brain

Answer

National surgical adjuvant for breast project

Question 6

A 10 cm tumor is found on the anterior surface of the thigh. What is the most appropriate procedure to obtain a diagnosis?

Accepted Answer

Incision biopsy

Answer

Excision biopsy

Answer

FNAC

Answer

USG

Question 7

Which is the most reliable diagnostic method for staging esophageal cancer?

Accepted Answer

Endoscopic ultrasound

Answer

MRI

Answer

CT scan

Answer

Thoracoscopy

Question 8

For which type of carcinoma is the Nigro protocol primarily used?

Accepted Answer

Anal

Answer

Colon

Answer

Hepatocellular

Answer

Pancreatic

Question 9

Biopsy of a clinically suspicious lesion is negative. The most appropriate treatment is

Accepted Answer

Repeat the biopsy for further evaluation.

Answer

Monitor the patient closely for twelve months.

Answer

Monitor the patient closely for three months.

Answer

Reassure the patient that the lesion is benign.

Question 10

What finding during surgery can change the staging of a tumor from Stage I to Stage II in a patient with a history of lung cancer?

Accepted Answer

Positive hilar/peribronchial lymph nodes

Answer

Involvement of the chest wall

Answer

Small cell histology

Answer

Tumor at the carina

Surgical Oncology Principles — MCQs

Surgical Oncology Principles — MCQs

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