Percutaneous Biopsy Techniques — MCQs
What is the main contraindication for performing a liver biopsy?
A woman with postmenopausal bleeding has thickened endometrium. Which approach is most suitable for evaluating malignancy risk?
Abbreviated laparotomy done for:
The following set of instruments are used for which procedure?
Which of the following thyroid carcinomas cannot be definitively diagnosed by fine needle aspiration cytology (FNAC)?
A 10 cm tumor is found on the anterior surface of the thigh. What is the most appropriate procedure to obtain a diagnosis?
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.
Which of the following is not a contraindication for renal biopsy?
What is the most common complication of TIPS (Transjugular Intrahepatic Portosystemic Shunt) procedure?
Transjugular intrahepatic portosystemic shunt (TIPS) is contraindicated in which of the following conditions?
Percutaneous Biopsy Techniques Indian Medical PG Practice Questions and MCQs
Question 1: What is the main contraindication for performing a liver biopsy?
- A. Severe thrombocytopenia
- B. Liver hemangioma
- C. Presence of ascites
- D. Severe coagulopathy (Correct Answer)
Explanation: ***Severe coagulopathy*** - **Severe coagulopathy** is the main contraindication for liver biopsy due to a significantly increased risk of **hemorrhage** [1]. - A **prothrombin time (PT)** or **activated partial thromboplastin time (aPTT)** significantly prolonged beyond the normal range, or an **INR > 1.5**, should be corrected before the procedure [1]. *Severe thrombocytopenia* - While **thrombocytopenia** (platelet count <50,000/µL) does increase bleeding risk, it is often correctable with a **platelet transfusion** prior to biopsy, making it a relative rather than an absolute contraindication [1]. - The risk of major bleeding is typically lower with isolated thrombocytopenia compared to severe coagulopathy. *Liver hemangioma* - The presence of a **liver hemangioma** at the biopsy site is a contraindication as biopsying it can lead to massive hemorrhage. - However, if the biopsy can be performed safely away from the hemangioma, it is not an absolute contraindication to the procedure itself. *Presence of ascites* - **Ascites** can complicate a liver biopsy by increasing the risk of **peritoneal bleeding** and difficulty in targeting the liver [1]. - However, it is often manageable by draining the ascites or using imaging guidance, making it a relative contraindication rather than an absolute one [1].
Question 2: A woman with postmenopausal bleeding has thickened endometrium. Which approach is most suitable for evaluating malignancy risk?
- A. Endometrial biopsy (Correct Answer)
- B. Transvaginal ultrasound
- C. Pap smear
- D. Hysteroscopy
Explanation: ***Endometrial biopsy*** - An **endometrial biopsy** directly obtains tissue samples from the endometrial lining, allowing for histological examination to definitively diagnose or rule out **endometrial hyperplasia** or **carcinoma**. - This is the **most suitable first-line approach** when postmenopausal bleeding is coupled with a thickened endometrium, as it directly assesses for **malignancy at a cellular level**. - It is **cost-effective, minimally invasive, and can be performed in an office setting** without anesthesia. *Transvaginal ultrasound* - While a **transvaginal ultrasound** can measure endometrial thickness and identify structural abnormalities, it cannot definitively differentiate between benign and malignant changes. - It serves as an initial screening tool but requires further investigation like a **biopsy** for definitive diagnosis in cases of thickened endometrium and postmenopausal bleeding. - An endometrial thickness >4-5 mm in postmenopausal women warrants tissue diagnosis. *Pap smear* - A **Pap smear** (Papanicolaou test) is used to screen for **cervical cancer** by collecting cells from the cervix. - It is not effective for detecting **endometrial pathologies** or cancer of the uterine lining. *Hysteroscopy* - **Hysteroscopy** allows for direct visualization of the uterine cavity and directed biopsies under direct vision, which is highly accurate for identifying focal lesions such as polyps or fibroids. - While it provides excellent diagnostic accuracy, it is **more invasive, expensive, and typically requires anesthesia**. - For initial evaluation of postmenopausal bleeding with diffuse endometrial thickening, **endometrial biopsy is preferred** as the first-line approach due to its accessibility, lower cost, and adequate sensitivity (>90% for detecting endometrial cancer).
Question 3: Abbreviated laparotomy done for:
- A. Hemodynamically stable patients with minor trauma
- B. Damage control in hemodynamically unstable trauma patients (Correct Answer)
- C. Elective abdominal surgeries
- D. Early wound healing promotion
Explanation: ***Damage control in hemodynamically unstable trauma patients*** - **Abbreviated laparotomy** is a key component of **damage control surgery**, primarily indicated for hemodynamically unstable trauma patients. - The goal is to rapidly control life-threatening issues like hemorrhage and contamination, then temporarily close the abdomen for physiologic stabilization before definitive repair. *Hemodynamically stable patients with minor trauma* - These patients typically do not require prompt surgical intervention; their injuries can often be managed non-operatively or with standard surgical techniques. - An abbreviated laparotomy is an aggressive approach reserved for severe, life-threatening scenarios, not minor trauma in stable patients. *Elective abdominal surgeries* - Elective surgeries are planned procedures performed on stable patients with no immediate life-threatening conditions. - They allow for complete surgical repair in a single setting, which is the opposite of the staged approach of an abbreviated laparotomy. *Early wound healing promotion* - The focus of an abbreviated laparotomy is on resuscitation and source control, not primarily on wound healing. - The initial closure is temporary, often leaving the wound open, which is not conducive to early, primary wound healing.
Question 4: The following set of instruments are used for which procedure?
- A. Biopsy
- B. Dilatation and curettage
- C. Pap smear (Correct Answer)
- D. Hysteroscopy
Explanation: ***Pap smear*** - The image displays a complete set of instruments used for a **Pap smear**, including **glass slides** for sample collection, a **cervical brush**, a **spatula** (cytobrush and Ayre spatula), and a **speculum** to visualize the cervix. - These tools are specifically designed for collecting cervical cells to screen for **cervical cancer** and **precancerous changes**. *Biopsy* - A biopsy typically involves specialized instruments like **punch biopsy tools**, **forceps**, or needles to extract tissue samples, which are not depicted here. - While glass slides might be used for processing biopsy samples, the primary collection tools are absent. *Dilatation and curettage* - This procedure requires instruments such as **dilators** to open the cervix and **curetters** to scrape the uterine lining, which are not shown in the image. - The instruments shown are for surface cell collection, not for uterine cavity procedures. *Hysteroscopy* - Hysteroscopy uses a **hysteroscope**—a thin, lighted tube with a camera—to visualize the inside of the uterus. - The instruments in the image are for external examination and cervical cell collection, not for direct visualization of the uterine cavity.
Question 5: Which of the following thyroid carcinomas cannot be definitively diagnosed by fine needle aspiration cytology (FNAC)?
- A. Anaplastic carcinoma of thyroid
- B. Medullary carcinoma of thyroid
- C. Follicular carcinoma of thyroid (Correct Answer)
- D. Papillary carcinoma of thyroid
Explanation: ***Follicular carcinoma of thyroid*** - The definitive diagnosis of **follicular carcinoma** requires the presence of **capsular or vascular invasion**, which cannot be assessed through **fine needle aspiration cytology (FNAC)** alone [1], [5]. - FNA may show features suggestive of follicular neoplasm (e.g., hypercellularity with microfollicles), but differentiation from **follicular adenoma** requires histological examination of the excised specimen [1], [4]. *Anaplastic carcinoma of thyroid* - **Anaplastic carcinoma** is highly aggressive and characterized by **pleomorphic, bizarre cells** that are easily identifiable on FNAC [2], [5]. - The distinctive cytological features, including **spindle cells, giant cells, and rapid cellular atypia**, allow for a relatively straightforward diagnosis via FNAC [2]. *Medullary carcinoma of thyroid* - **Medullary carcinoma** cells have characteristic cytological features, such as **plasmacytoid appearance**, **amyloid deposition**, and **neuroendocrine granules**, which can be identified on FNAC [5]. - Confirmation can be made by **immunohistochemical staining for calcitonin** on the FNA sample [5]. *Papillary carcinoma of thyroid* - **Papillary carcinoma** has distinct cytological features, including **orphan Annie eye nuclei**, **intranuclear grooves**, **pseudoinclusions**, and **papillary structures**, readily identified by FNAC [3]. - These features are highly specific and often allow for a definitive diagnosis of papillary thyroid carcinoma [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1100-1101. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1101-1102. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 429-430. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 428-429. [5] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 430-431.
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?
- A. Incision biopsy (Correct Answer)
- B. Excision biopsy
- C. FNAC
- D. USG
Explanation: ***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.
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
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
Question 8: Which of the following is not a contraindication for renal biopsy?
- A. Bleeding diathesis
- B. CRF with normal kidney (Correct Answer)
- C. 60 % damage of kidney texture
- D. Uncontrolled hypertension
Explanation: ***CRF with normal kidney*** - This is **not a contraindication** because chronic renal failure (CRF) with a normal-sized kidney often indicates a potentially **reversible or treatable** underlying kidney disease, making biopsy valuable for diagnosis and guiding treatment. [1] - A biopsy could help determine the specific cause of CRF, such as certain **glomerulonephropathies**, that might respond to targeted therapies. [1] *Bleeding diathesis* - A **bleeding diathesis**, such as severe **thrombocytopenia** or significant coagulopathy, significantly increases the risk of **hemorrhage** during and after a percutaneous renal biopsy. - This condition makes procedures that involve tissue penetration particularly hazardous due to uncontrolled bleeding. *60 % damage of kidney texture* - **Extensive kidney damage** (e.g., 60% damage or severely atrophic kidneys) often indicates **advanced, irreversible fibrosis**, where a biopsy is unlikely to provide therapeutically actionable information. [1] - The procedure carries risks, and if the kidney is severely compromised, the diagnostic yield is low, while the risk of complications (e.g., bleeding, infection) remains. *Uncontrolled hypertension* - **Uncontrolled hypertension** poses a significant risk for complications, particularly **post-biopsy bleeding** and **hematoma formation**, due to increased intravascular pressure. [1] - Blood pressure should be adequately controlled (e.g., below 140/90 mmHg) before performing a renal biopsy to minimize these vascular risks.
Question 9: What is the most common complication of TIPS (Transjugular Intrahepatic Portosystemic Shunt) procedure?
- A. Heart failure
- B. Hepatic Encephalopathy (Correct Answer)
- C. Thrombosis
- D. Recurrent Variceal bleed
Explanation: **Explanation:** **TIPS (Transjugular Intrahepatic Portosystemic Shunt)** is an artificial channel created between the high-pressure portal vein and the low-pressure hepatic vein to treat complications of portal hypertension. **Why Hepatic Encephalopathy (HE) is the correct answer:** The primary mechanism of TIPS involves bypassing the liver’s filtration system. By creating a shunt, portal blood (rich in ammonia and other neurotoxins derived from the gut) enters the systemic circulation directly without being detoxified by hepatocytes. This leads to **Hepatic Encephalopathy in approximately 25–45% of patients**, making it the most frequent complication post-procedure. **Analysis of Incorrect Options:** * **A. Heart Failure:** While the sudden increase in venous return to the right atrium (preload) can precipitate acute heart failure in patients with underlying cardiac disease, it is far less common than HE. * **C. Thrombosis:** Shunt stenosis or thrombosis was common with bare-metal stents; however, with the modern use of **PTFE-covered stents**, the incidence of thrombosis has significantly decreased. * **D. Recurrent Variceal Bleed:** TIPS is highly effective at decompressing varices. Re-bleeding usually only occurs if the shunt becomes occluded or stenosed, which is a secondary event. **High-Yield Clinical Pearls for NEET-PG:** * **Indications:** Refractory variceal bleeding (most common indication) and refractory ascites. * **Absolute Contraindications:** Severe congestive heart failure (Right-sided), polycystic liver disease, and severe active systemic infection/sepsis. * **Technical Goal:** To reduce the **Portosystemic Pressure Gradient (PSG) to <12 mmHg** to prevent re-bleeding. * **Stent Type:** PTFE-covered stents (e.g., VIATORR) are the gold standard to maintain patency.
Question 10: Transjugular intrahepatic portosystemic shunt (TIPS) is contraindicated in which of the following conditions?
- A. Post-shunt encephalopathy
- B. Cirrhosis
- C. Portal vein thrombosis (Correct Answer)
- D. Variceal bleeding
Explanation: **Explanation:** **Transjugular Intrahepatic Portosystemic Shunt (TIPS)** is an interventional procedure where a shunt is created between the hepatic vein and the portal vein to reduce portal hypertension. **Why Portal Vein Thrombosis (PVT) is the correct answer:** The success of a TIPS procedure depends on the ability to access and pass a wire through the portal vein to establish the shunt. In cases of **extensive or cavernous portal vein thrombosis**, the target vessel is either occluded or replaced by small collateral vessels, making the procedure technically impossible or highly hazardous. While partial PVT is sometimes managed by experienced interventionists, complete PVT remains a classic **absolute contraindication** in standard practice. **Analysis of Incorrect Options:** * **Post-shunt encephalopathy (A):** This is a common **complication** of TIPS, not a contraindication for the initial procedure. However, pre-existing severe hepatic encephalopathy is a relative contraindication. * **Cirrhosis (B):** Cirrhosis with portal hypertension is the **primary indication** for TIPS (specifically for refractory ascites or variceal bleeding). * **Variceal bleeding (D):** This is a **major indication** for TIPS, especially when bleeding is refractory to endoscopic management (Rescue TIPS). **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Severe congestive heart failure (R-sided), severe pulmonary hypertension, and multiple hepatic cysts/polycystic liver disease. * **Relative Contraindications:** Active systemic infection, severe coagulopathy, and rapidly progressing hepatoma. * **MELD Score:** A MELD score >18 is associated with higher mortality post-TIPS. * **Mechanism:** TIPS bypasses the liver parenchyma, effectively converting sinusoidal portal hypertension into a side-to-side portocaval shunt.
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