Transplant Surgery Practice Questions

Q: What is the most common malignancy observed after renal transplantation?

Skin cancer. **Explanation:** The correct answer is **Skin cancer**. Post-transplant patients are at a significantly higher risk of developing malignancies compared to the general population due to long-term **immunosuppressive therapy**, which impairs the body’s immune surveillance against oncogenic viruses and UV-damaged cells. **1. Why Skin Cancer is Correct:** Skin cancers, particularly **Squamous Cell Carcinoma (SCC)**, are the most common malignancies following renal transplantation. Unlike the general population where Basal Cell Carcinoma (BCC) is more frequent, in transplant recipients, SCC is more common (SCC:BCC ratio is reversed). Risk factors include prolonged immunosuppression, sun exposure, and infection with Human Papillomavirus (HPV). **2. Analysis of Incorrect Options:** * **Lymphoma (Option A):** While **Post-Transplant Lymphoproliferative Disorder (PTLD)** is a serious and well-known complication (often associated with Epstein-Barr Virus), it is less common than skin cancer. * **Renal Cell Carcinoma (Option B):** There is an increased risk of RCC in the native kidneys (especially in patients with acquired cystic kidney disease), but it does not surpass the incidence of skin malignancies. * **Adrenal Cancer (Option D):** This is a rare malignancy and is not specifically associated with the post-transplant immunosuppressed state. **Clinical Pearls for NEET-PG:** * **Most common malignancy overall:** Skin cancer (SCC > BCC). * **Most common non-skin malignancy:** Lymphoma (PTLD). * **Most common viral association:** EBV is linked to PTLD; HHV-8 is linked to Kaposi Sarcoma. * **Screening:** Transplant recipients require lifelong, annual dermatological evaluation. * **Management:** If malignancy occurs, the first step is often the reduction or modification of immunosuppressive agents (e.g., switching to mTOR inhibitors like Sirolimus, which have anti-tumor properties).

Q: What does xenograft mean?

Transplanting organs from one species to another. **Explanation:** The terminology of transplantation is based on the genetic relationship between the donor and the recipient. **1. Why Option A is correct:** A **Xenograft** (or Heterograft) refers to a transplant between members of different species (e.g., a porcine heart valve transplanted into a human). Because of the significant genetic disparity, xenografts are prone to **Hyperacute Rejection**, primarily mediated by pre-existing antibodies against alpha-gal antigens. **2. Why the other options are incorrect:** * **Option B (Allograft):** This is a transplant between genetically non-identical members of the **same species** (e.g., a kidney from a deceased human donor to a human recipient). This is the most common type of clinical transplant. * **Option C (Isograft/Syngeneic graft):** This refers to a transplant between **genetically identical** individuals, such as monozygotic (identical) twins. In this case, there is no risk of immunological rejection. * **Option D (Autograft):** This involves moving tissue from **one site to another within the same individual** (e.g., a skin graft from the thigh to the arm or a CABG using the Great Saphenous Vein). There is no risk of rejection. **Clinical Pearls for NEET-PG:** * **Hyperacute Rejection** is the hallmark of xenotransplantation, occurring within minutes due to pre-formed antibodies. * **Galα1,3-Gal (Alpha-gal)** is the major xenoantigen responsible for rejection in humans. * **Pigs** are currently considered the most suitable source for xenotransplantation due to physiological similarities and ease of breeding. * **Order of Rejection Risk:** Xenograft > Allograft > Isograft = Autograft.

Q: Which of the following statements is NOT true regarding Milan criteria for liver transplantation?

More than 5 nodules. The **Milan Criteria** are the gold standard guidelines used to determine the eligibility of patients with **Hepatocellular Carcinoma (HCC)** for liver transplantation. They were established to ensure optimal post-transplant survival rates (75% at 5 years) by selecting patients with low risk of tumor recurrence. ### **Explanation of the Correct Option** * **C. More than 5 nodules:** This is the **incorrect** statement. According to Milan criteria, the maximum number of nodules allowed is **three**. Having more than five nodules indicates advanced disease with a high risk of vascular invasion and recurrence, making the patient ineligible for standard transplantation. ### **Analysis of Other Options** * **A. Single tumor less than 5 cm:** This is a core component of the criteria. A solitary lesion must be $\leq$ 5 cm in diameter. * **B. Three nodules, each less than 3 cm:** If multiple tumors are present, there must be no more than three, and each individual nodule must be $\leq$ 3 cm in diameter. * **D. No extrahepatic disease:** For a transplant to be successful, the cancer must be localized to the liver. Any evidence of extrahepatic spread or **macrovascular invasion** (e.g., portal vein involvement) is an absolute contraindication. ### **High-Yield Clinical Pearls for NEET-PG** * **UCSF Criteria:** A slightly expanded version of Milan (Single lesion $\leq$ 6.5 cm OR $\leq$ 3 lesions with largest $\leq$ 4.5 cm and total diameter $\leq$ 8 cm). * **Bridging Therapy:** While waiting for a transplant, patients meeting Milan criteria may undergo TACE (Transarterial Chemoembolization) or RFA (Radiofrequency Ablation) to prevent tumor progression. * **Downstaging:** This refers to using local therapies to bring a tumor that is initially outside Milan criteria into the acceptable range for transplantation.

Q: Post-transplant nephropathy after 1 month is most likely due to which of the following?

Polyoma BK virus. **Explanation:** **Polyoma BK Virus** is the most common viral cause of renal allograft dysfunction (nephropathy) occurring typically within the first few months to a year post-transplant. The virus, which remains latent in the urinary tract of most healthy individuals, reactivates under the influence of potent immunosuppression (especially tacrolimus and mycophenolate mofetil). It leads to **BK Virus-Associated Nephropathy (BKVAN)**, characterized by a rising serum creatinine and histological features mimicking rejection (tubulitis and interstitial inflammation). **Analysis of Incorrect Options:** * **Hepatitis C (Option A):** While HCV can cause glomerulonephritis (like MPGN) in the long term, it is not a primary cause of acute/subacute post-transplant nephropathy within the first month. * **HHV-6 (Option B):** Human Herpesvirus 6 is associated with fever, skin rash, and bone marrow suppression post-transplant, but it is rarely a direct cause of nephropathy. * **Herpes Simplex Virus (Option D):** HSV typically presents with mucocutaneous lesions or systemic viremia (hepatitis/pneumonitis) rather than specific renal allograft parenchymal damage. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The gold standard is a **renal biopsy** showing characteristic intranuclear inclusion bodies (ground-glass appearance) and positive SV40 staining. * **Screening:** Done via **decoy cells** in urine cytology (high sensitivity, low specificity) or **BK-PCR** in plasma (preferred for monitoring). * **Management:** The primary treatment is the **reduction of immunosuppressive therapy**. * **Timeline:** While hyperacute rejection occurs in minutes and acute rejection in days/weeks, BKVAN is a significant differential for graft dysfunction starting around 1–3 months post-surgery.

Q: Which of the following criteria indicates an extended criteria donor for liver transplantation?

Hepatitis C positive. **Explanation:** **Extended Criteria Donors (ECD)**, also known as marginal donors, are those who do not meet the standard criteria for organ donation but are utilized to bridge the gap between organ demand and availability. These organs carry a higher risk of initial poor function or graft failure but can be life-saving for specific recipients. **Why Hepatitis C Positive is the Correct Answer:** Historically, Hepatitis C (HCV) positive livers were considered unsuitable. However, they are now classified as ECD organs. With the advent of highly effective **Direct-Acting Antivirals (DAAs)**, HCV-positive grafts can be safely transplanted into HCV-positive recipients or even HCV-negative recipients (with informed consent and post-transplant antiviral therapy), as the cure rate for the virus is now near 100%. **Analysis of Other Options:** * **Age greater than 60 years (Option A):** While advanced age is a factor in ECD, the standard threshold used in most liver transplant scoring systems (like the Donor Risk Index) is typically **greater than 70 years**, not 60. * **Primary Sclerosing Cholangitis (Option C):** PSC is an **indication** for receiving a transplant, not a criterion for being a donor. Donor criteria focus on the health and quality of the donor's liver (e.g., steatosis, viral status, ischemia time). **High-Yield Clinical Pearls for NEET-PG:** * **Common ECD Criteria:** Donor age >70, macrosteatosis >30%, prolonged cold ischemia time (>12 hours), hypernatremia (Sodium >155 mEq/L), and donors with positive serology (HCV, HBcAb). * **MELD Score:** Used to prioritize recipients based on the severity of their liver disease (incorporates Bilirubin, Creatinine, and INR). * **Milan Criteria:** Used to determine eligibility for liver transplant in patients with Hepatocellular Carcinoma (Single lesion <5cm or up to 3 lesions <3cm each).

Q: Which of the following is NOT an indication for liver transplantation?

None of the above. **Explanation:** The correct answer is **D (None of the above)** because all the listed conditions (Cirrhosis, Primary hepatic malignancy, and Acute fulminant liver failure) are well-established indications for liver transplantation. 1. **Cirrhosis (Option A):** Chronic Liver Disease (CLD) resulting in end-stage liver disease is the most common indication for transplantation. This includes cirrhosis caused by Hepatitis C, Hepatitis B, Alcoholic Liver Disease, and Non-Alcoholic Steatohepatitis (NASH). 2. **Primary Hepatic Malignancy (Option B):** Specifically, **Hepatocellular Carcinoma (HCC)** is a major indication, provided it meets the **Milan Criteria** (single lesion ≤5 cm or up to 3 lesions each ≤3 cm, with no extrahepatic spread or vascular invasion). 3. **Acute Fulminant Liver Failure (Option C):** This refers to rapid-onset liver failure (within 8 weeks of jaundice) in a patient without prior liver disease. Common causes include Paracetamol (Acetaminophen) toxicity, viral hepatitis (A, B, or E), and Wilson’s disease. **High-Yield Clinical Pearls for NEET-PG:** * **MELD Score (Model for End-Stage Liver Disease):** Uses Bilirubin, Creatinine, and INR to prioritize patients on the transplant waiting list. * **Most Common Indication (Global):** Hepatitis C-related cirrhosis (historically) and NASH (rising). * **Most Common Indication in Children:** Biliary Atresia. * **Absolute Contraindications:** Extrahepatic malignancy, active systemic infection, active substance abuse, and advanced cardiopulmonary disease. * **King’s College Criteria:** Used specifically to determine the prognosis and need for transplantation in Acute Liver Failure.

Q: What is the most common indication for liver transplantation in adults?

Cirrhosis. **Explanation:** **Liver transplantation** is the definitive treatment for end-stage liver disease (ESLD) and acute liver failure. **Why Cirrhosis is Correct:** In adults, **Cirrhosis** is the most common indication for liver transplantation worldwide. Cirrhosis represents the final common pathway of various chronic liver insults, leading to irreversible scarring and loss of function. While the underlying etiology of cirrhosis varies—historically **Hepatitis C** was the leading cause, but it is currently being surpassed by **Non-Alcoholic Steatohepatitis (NASH/NAFLD)** and **Alcoholic Liver Disease**—the clinical state of cirrhosis remains the primary reason for transplant. **Analysis of Incorrect Options:** * **Portal Vein Thrombosis (A):** This is often a *complication* of cirrhosis or a contraindication/technical challenge during surgery, rather than a primary indication for the transplant itself. * **Biliary Atresia (C):** This is the **most common indication for liver transplantation in the pediatric population**, not adults. It involves the congenital absence or obstruction of the bile ducts. **High-Yield Clinical Pearls for NEET-PG:** * **MELD Score (Model for End-Stage Liver Disease):** Used to prioritize adult patients on the transplant waiting list. It uses Serum Bilirubin, Creatinine, and INR. * **PELD Score:** Used for pediatric patients (under age 12). * **Milan Criteria:** Used to determine eligibility for transplant in patients with **Hepatocellular Carcinoma (HCC)** (Single lesion <5cm or up to 3 lesions each <3cm). * **Most common cause of death post-transplant:** Infection (early) and Cardiovascular disease/Malignancy (late).

Q: Which type of transplant graft has the least chance of recipient failure?

Isograft. **Explanation:** The success of a transplant depends primarily on the **genetic compatibility** between the donor and the recipient. The less the antigenic disparity, the lower the risk of immune-mediated rejection. **Why Isograft is Correct:** An **Isograft (Syngeneic graft)** is a transplant between genetically identical individuals of the same species, such as **monozygotic (identical) twins**. Because the Human Leukocyte Antigens (HLA) are identical, the recipient’s immune system does not recognize the graft as "foreign." Consequently, there is virtually no risk of rejection, and long-term immunosuppression is generally not required. This makes it the graft with the least chance of failure. **Why Other Options are Incorrect:** * **Allograft:** This is a transplant between genetically different members of the same species (e.g., from a deceased donor or a sibling). This is the most common type of clinical transplant but requires lifelong immunosuppression to prevent rejection. * **Xenograft:** This involves transplantation between different species (e.g., pig heart to human). These carry the highest risk of failure due to **hyperacute rejection** mediated by pre-existing antibodies. * **Heterotopic Graft:** This refers to the **anatomical site** of the transplant (placing the organ in a different location, like a kidney in the iliac fossa) rather than the genetic relationship. It does not inherently determine the immunological failure rate. **High-Yield Clinical Pearls for NEET-PG:** * **Autograft:** Transplant within the same individual (e.g., skin graft, CABG). It has **zero** chance of rejection. (If "Autograft" were an option, it would be the most successful). * **First Successful Human Transplant:** A kidney transplant performed by Joseph Murray in 1954 between **identical twins** (Isograft). * **Order of Rejection Risk:** Autograft < Isograft < Allograft < Xenograft.

Q: In renal transplant surgery, where is the transplanted kidney typically placed?

Iliac fossa. In renal transplantation, the **Iliac Fossa** (Option A) is the preferred site for placement of the donor kidney. This is known as **heterotopic transplantation**, meaning the organ is placed in a location different from its original anatomical position. ### Why the Iliac Fossa? 1. **Vascular Access:** The iliac fossa provides easy access to the **External Iliac vessels**. The donor renal artery is typically anastomosed to the Internal or External Iliac artery, and the donor renal vein to the External Iliac vein. 2. **Ureteric Length:** Placing the kidney in the pelvis minimizes the distance the donor ureter must travel to reach the bladder (**Ureteroneocystostomy**), reducing the risk of ureteric ischemia or necrosis. 3. **Protection and Access:** The bony pelvis protects the graft, yet it remains superficial enough for easy clinical palpation and ultrasound-guided biopsies. ### Why other options are incorrect: * **Subcostal area (B) and Loin (C):** These represent the **orthotopic** position (the native renal bed). This site is avoided because it requires a deeper dissection, offers more difficult vascular anastomosis, and necessitates a much longer ureteric length, increasing surgical morbidity. ### High-Yield Clinical Pearls for NEET-PG: * **Side of Placement:** Usually, the **left donor kidney** is transplanted into the **right iliac fossa** of the recipient (and vice versa). This "flips" the kidney so the renal pelvis is anterior and the vessels are posterior, facilitating easier surgical access. * **Gibson Incision:** The standard surgical approach used to access the extraperitoneal iliac fossa. * **Native Kidneys:** These are generally **not removed** unless they are causing complications like refractory hypertension, recurrent infections, or are too large (e.g., Autosomal Dominant Polycystic Kidney Disease).

Question 1

What is the most common malignancy observed after renal transplantation?

Accepted Answer

Skin cancer

Answer

Lymphoma

Answer

Renal cell carcinoma

Answer

Adrenal cancer

Question 2

What does xenograft mean?

Accepted Answer

Transplanting organs from one species to another

Answer

Transplanting organs from a member of the same species

Answer

Transplanting organs from twin to twin

Answer

Transplanting organs from one site to another in an individual

Question 3

Which of the following statements is NOT true regarding Milan criteria for liver transplantation?

Accepted Answer

More than 5 nodules

Answer

Single tumor less than 5 cm in size

Answer

Three nodules, each less than 3 cm in size

Answer

No extrahepatic disease

Question 4

Post-transplant nephropathy after 1 month is most likely due to which of the following?

Accepted Answer

Polyoma BK virus

Answer

Hepatitis C

Answer

HHV-6

Answer

Herpes simplex viruses

Question 5

Which of the following criteria indicates an extended criteria donor for liver transplantation?

Accepted Answer

Hepatitis C positive

Answer

Age greater than 60 years

Answer

Primary sclerosing cholangitis

Answer

All of the above

Question 6

Which of the following is NOT an indication for liver transplantation?

Accepted Answer

None of the above

Answer

Cirrhosis

Answer

Primary hepatic malignancy

Answer

Acute fulminant liver failure

Question 7

What is the most common indication for liver transplantation in adults?

Accepted Answer

Cirrhosis

Answer

Portal vein thrombosis

Answer

Biliary atresia

Answer

None of the above

Question 8

Which type of transplant graft has the least chance of recipient failure?

Accepted Answer

Isograft

Answer

Allograft

Answer

Xenograft

Answer

Heterotopic Graft

Question 9

In renal transplant surgery, where is the transplanted kidney typically placed?

Accepted Answer

Iliac fossa

Answer

Subcostal area

Answer

Loin

Answer

None of the above

Question 10

Which of the following statements regarding renal transplantation is NOT true?

Accepted Answer

The recipient's native kidneys are usually removed from the renal fossa to make space for the donor kidney.

Answer

A curvilinear incision is typically made in the lower quadrant.

Answer

The transplanted kidney is placed in the retroperitoneal position.

Answer

Anastomosis of the external iliac artery with the renal artery is performed.

Transplant Surgery — MCQs

Transplant Surgery — MCQs

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