Abdomen — MCQs

A 20-year-old male presents with repeated episodes of hematemesis. There is no history of jaundice or liver decompensation. On examination, significant findings include splenomegaly (8 cm below the costal margin) and the presence of esophageal varices. There is no ascites or peptic ulceration. The liver function tests are normal. What is the most likely diagnosis?

Abdomen Indian Medical PG Practice Questions and MCQs

Question 661: Which structure is held by forceps?

A. Stomach
B. Appendix
C. Colon (Correct Answer)
D. Duodenum

Explanation: ***Colon*** - The structure shows characteristic **haustra** (sacculated appearance) and **taenia coli** (three longitudinal muscle bands) that are pathognomonic of the large intestine. - **Omental appendices** (small fatty projections) are visible, which are unique anatomical features found only in the colon. *Stomach* - The stomach has a **smooth muscular wall** without haustra and lacks the sacculated appearance seen in this image. - It would show **rugae** (longitudinal folds) on the inner surface and has a characteristic **C-shaped curve**, not the tubular structure with haustra. *Appendix* - The appendix is a **small, narrow, worm-like structure** approximately 2-4 inches long, much smaller than what's shown. - It lacks **haustra** and **taenia coli**, appearing as a smooth, thin tubular structure attached to the cecum. *Duodenum* - The duodenum is the first part of the **small intestine** with a smooth wall and **circular folds (plicae circulares)** internally. - It lacks the **haustra**, **taenia coli**, and **omental appendices** that are characteristic features of the large intestine.

Question 662: The cholecysto-venacaval line separates which of the following structures?

A. Gallbladder and Inferior Vena Cava (IVC)
B. Portal hepatis and Inferior Vena Cava (IVC)
C. Caudate lobe and quadrangular lobe of the liver
D. Right and left lobes of the liver (Correct Answer)

Explanation: The **cholecysto-venacaval line**, also known as **Cantlie’s line**, is the functional anatomical boundary used to divide the liver into its true physiological right and left lobes [1]. This line extends from the **gallbladder fossa** anteriorly to the groove for the **inferior vena cava (IVC)** posteriorly. 1. **Why the correct answer is right:** Unlike the falciform ligament (which divides the liver anatomically), Cantlie’s line follows the plane of the **middle hepatic vein** [1]. This division is clinically significant because the right and left lobes defined by this line have independent vascular supply (hepatic artery and portal vein) and biliary drainage, forming the basis for functional hepatic lobectomy [1]. 2. **Why the incorrect options are wrong:** * **Options A & B:** These describe the anatomical landmarks that *define* the line, rather than the structures *separated* by it. * **Option C:** The **Caudate lobe** is located on the posterior surface (Segment I), while the **Quadrate lobe** is on the inferior surface (Segment IVb) [1]. They are separated by the porta hepatis and the fissure for the ligamentum venosum, not the cholecysto-venacaval line. **High-Yield Clinical Pearls for NEET-PG:** * **Anatomical vs. Functional:** The falciform ligament divides the liver into anatomical lobes, but Cantlie’s line divides it into functional lobes [1]. * **Couinaud Classification:** The liver is divided into 8 functional segments based on this principle [1]. * **Surgical Landmark:** During a right hepatectomy, surgeons follow Cantlie’s line to avoid damaging the primary blood supply of the left lobe. * **Middle Hepatic Vein:** This vein lies exactly within the plane of the cholecysto-venacaval line [1].

Question 663: Which of the following is NOT true about the right kidney?

A. The right kidney is preferred over the left for transplantation. (Correct Answer)
B. It is located lower than the left kidney.
C. The right renal vein is shorter than the left renal vein.
D. The right kidney is related to the duodenum.

Explanation: ### Explanation **1. Why Option A is the Correct Answer (The "False" Statement):** In clinical practice, the **left kidney is preferred** over the right for donor transplantation. This is primarily due to the length of the renal vein. The left renal vein is significantly longer than the right (as it must cross the midline to reach the IVC), providing a longer vascular pedicle that makes the surgical anastomosis (connection) to the recipient's iliac vessels much easier and safer [2]. **2. Analysis of Incorrect Options (True Statements):** * **Option B:** The right kidney is indeed located lower (usually by about 1.25 cm or half a vertebral level) than the left kidney. This displacement is caused by the massive size of the **liver** situated superior to it. * **Option C:** The right renal vein is shorter (approx. 2.5 cm) compared to the left renal vein (approx. 7.5 cm). This is because the Inferior Vena Cava (IVC) lies to the right of the midline, closer to the right kidney. * **Option D:** The **second (descending) part of the duodenum** lies directly anterior to the medial aspect of the right kidney (hilar region) [1]. This is a vital surgical landmark during Kocherization of the duodenum. **3. High-Yield Clinical Pearls for NEET-PG:** * **Left Renal Vein Entrapment:** Also known as the **Nutcracker Syndrome**, where the left renal vein is compressed between the Superior Mesenteric Artery (SMA) and the Abdominal Aorta. * **Renal Vein Drainage:** The left renal vein receives the **left gonadal vein** and left suprarenal vein [1], whereas on the right side, these veins drain directly into the IVC. * **Vertebral Level:** The kidneys typically extend from **T12 to L3**. The right kidney's hilum is usually at the level of the L2 vertebra, while the left is at L1.

Question 664: What is the length of the lower esophageal sphincter?

A. 1-2 cm
B. 3-4 cm (Correct Answer)
C. 1-2 mm
D. 3-4 mm

Explanation: ### Explanation The **Lower Esophageal Sphincter (LES)** is a specialized segment of circular smooth muscle located at the gastroesophageal junction. Unlike the upper esophageal sphincter, the LES is a **physiological sphincter**, meaning it is not characterized by a distinct anatomical thickening of muscle but is identified by a high-pressure zone (10–30 mmHg) on manometry [1]. **1. Why Option B is Correct:** The LES typically measures **3 to 4 cm** in length [2]. It is situated partly above and partly below the diaphragm. This length is critical for maintaining the "anti-reflux barrier." The intra-abdominal portion of this length (usually ~2 cm) is particularly important because positive intra-abdominal pressure helps keep the sphincter closed, preventing the reflux of gastric contents [2]. **2. Why Other Options are Incorrect:** * **Option A (1-2 cm):** This is too short. While the intra-abdominal segment alone may be this length, the total functional sphincter spans 3-4 cm. * **Options C & D (1-2 mm / 3-4 mm):** These values are far too small for a human sphincter. Dimensions in millimeters usually refer to the thickness of the esophageal wall or the diameter of small vessels, not the longitudinal length of a functional segment. **3. Clinical Pearls for NEET-PG:** * **Z-line:** The squamocolumnar junction where the esophageal mucosa (stratified squamous) meets the gastric mucosa (columnar). It usually lies within the LES. * **Achalasia Cardia:** Characterized by the failure of the LES to relax and loss of peristalsis, often showing a "Bird’s beak" appearance on barium swallow [2]. * **GERD:** Occurs when the LES is incompetent or has transient relaxations [2]. * **Phrenico-esophageal ligament:** Anchors the esophagus to the diaphragm, allowing independent movement during respiration and swallowing [1].

Question 665: In a patient with compensated liver cirrhosis who presented with a history of variceal bleed, what is the treatment of choice?

A. Propranolol
B. Liver transplantation
C. TIPS (Transjugular intrahepatic portosystemic shunt)
D. Endoscopic sclerotherapy (Correct Answer)

Explanation: **Explanation:** The management of esophageal varices in cirrhosis depends on whether the goal is prophylaxis or the treatment of an acute/recurrent bleed. [1] **Why Endoscopic Sclerotherapy is correct:** In a patient who has already presented with a history of variceal bleeding (secondary prophylaxis or acute management), endoscopic intervention is the gold standard. [2] **Endoscopic Sclerotherapy (EST)** involves injecting a sclerosing agent (e.g., ethanolamine oleate) into the vein to induce thrombosis and fibrosis. While Endoscopic Variceal Ligation (EVL) is often preferred today due to fewer complications, EST remains a classic correct answer in many standardized exams for the definitive management of bleeding varices. [2] **Why the other options are incorrect:** * **Propranolol:** This is a non-selective beta-blocker used for **primary prophylaxis** (preventing the first bleed) or as an adjunct in secondary prophylaxis. It is not the "treatment of choice" for a patient who has already bled and requires definitive intervention. * **Liver Transplantation:** This is the definitive treatment for end-stage liver disease (decompensated cirrhosis), but it is not the immediate treatment of choice for managing variceal bleeding in a **compensated** patient. [1] * **TIPS:** This is a salvage procedure used when endoscopic and pharmacological treatments fail. [1] It is not the first-line treatment due to the risk of hepatic encephalopathy. [3] **High-Yield Facts for NEET-PG:** * **Drug of choice for acute variceal bleed:** Terlipressin (Somatostatin/Octreotide are alternatives). * **Primary Prophylaxis:** Propranolol or Nadolol. * **Best procedure for acute bleed:** Endoscopic Variceal Ligation (EVL) is generally superior to Sclerotherapy (EST) in modern practice. [2] * **Most common site of portosystemic anastomosis:** Lower end of the esophagus (Left gastric vein with Azygos vein).

Question 666: A gallstone gets impacted most commonly in which part of the common bile duct?

A. Supra duodenal
B. Retro duodenal
C. Ampulla of Vater (Correct Answer)
D. Common hepatic duct

Explanation: **Explanation:** The **Common Bile Duct (CBD)** is formed by the union of the cystic duct and the common hepatic duct. It is approximately 7.5 cm long and is divided into four parts: supraduodenal, retroduodenal, infraduodenal (paraduodenal), and intraduodenal. The **Ampulla of Vater (Hepatopancreatic ampulla)** is the terminal portion where the CBD joins the main pancreatic duct before opening into the second part of the duodenum [2]. This is the **narrowest part** of the entire biliary passage. According to the laws of physics and anatomy, a migrating gallstone is most likely to become impacted at the point of maximum constriction. Therefore, the Ampulla of Vater is the most common site for gallstone impaction, often leading to obstructive jaundice and potentially gallstone pancreatitis. **Analysis of Incorrect Options:** * **Supra duodenal:** This is the most accessible part of the CBD during surgery (choledochotomy) because it lies in the free edge of the lesser omentum [3], but it is wider than the ampulla. * **Retro duodenal:** This part lies behind the first part of the duodenum. While stones pass through it, it is not the primary site of anatomical narrowing. * **Common hepatic duct:** This is located proximal to the cystic duct junction [1]. Stones here are usually primary (formed in situ) or due to external compression (Mirizzi syndrome), rather than impaction of a migrating gallbladder stone. **Clinical Pearls for NEET-PG:** * **Narrowest points of the biliary tree:** 1. Ampulla of Vater (most common site of impaction), 2. Cystic duct (site of Hartmann’s pouch). * **Calot’s Triangle:** Bound by the cystic duct, common hepatic duct, and the inferior surface of the liver; it contains the cystic artery. * **Investigation of choice:** MRCP is the gold standard for diagnosing CBD stones (choledocholithiasis) [4], while ERCP is used for therapeutic extraction [5].

Question 667: Which artery is most commonly responsible for bleeding in duodenal ulcer hemorrhage?

A. Splenic artery
B. Gastroduodenal artery (Correct Answer)
C. Left gastric artery
D. Superior mesenteric artery

Explanation: **Explanation:** The **Gastroduodenal Artery (GDA)** is the correct answer because of its specific anatomical relationship with the duodenum. Most peptic ulcers causing significant hemorrhage are located on the **posterior wall of the first part of the duodenum (D1)**. The GDA descends vertically behind the first part of the duodenum; therefore, a penetrating posterior duodenal ulcer can erode directly into this large vessel, leading to massive, life-threatening hematemesis or melena [2]. **Analysis of Incorrect Options:** * **Splenic Artery:** This artery runs along the superior border of the pancreas. While it is the most common site for visceral artery aneurysms, it is associated with gastric ulcers on the posterior wall of the stomach (body), not duodenal ulcers. * **Left Gastric Artery:** This is the most common source of bleeding from **gastric ulcers**, specifically those located along the lesser curvature of the stomach [1]. * **Superior Mesenteric Artery (SMA):** The SMA lies inferior to the duodenum (crossing the third part). While it can compress the duodenum (SMA syndrome), it is not typically involved in duodenal ulcer erosion. **Clinical Pearls for NEET-PG:** * **Anterior vs. Posterior:** Anterior duodenal ulcers are more likely to **perforate** (causing pneumoperitoneum), whereas posterior duodenal ulcers are more likely to **bleed** (due to GDA erosion). * **Origin of GDA:** It is a branch of the **Common Hepatic Artery**, which arises from the Celiac Trunk. * **Management:** In refractory cases, the GDA may require surgical ligation or endovascular embolization [2].

Question 668: All of the following are true regarding the blood supply to the kidney, EXCEPT?

A. It is a type of portal circulation. (Correct Answer)
B. Stellate veins drain the superficial cortex.
C. Its segmental arteries are end-arteries.
D. The renal artery divides into five segmental arteries before entering the hilum.

Explanation: The renal circulation is a high-pressure system designed for filtration, but it does not follow the definition of a portal system [1]. **1. Why Option A is the Correct Answer (The Exception)** A **portal circulation** is defined as a system where blood passes through two consecutive capillary beds connected by a vein or artery before returning to the heart (e.g., Hepatic or Hypophyseal portal systems). In the kidney, blood flows from the afferent arteriole → glomerular capillaries → efferent arteriole → peritubular capillaries [1]. While this involves two capillary beds, it is technically a **specialized arterial portal system** (not a standard venous one), and in the context of standard anatomical descriptions for NEET-PG, the kidney is classified as having **terminal (end-artery) circulation**, not a "portal circulation" in the traditional sense. **2. Analysis of Other Options** * **Option B:** Stellate veins are star-shaped venules located in the superficial cortex that drain the outermost part of the renal cortex into the interlobular veins. * **Option C:** Segmental arteries are **anatomical end-arteries**. They do not have significant anastomoses with each other. Obstruction leads to wedge-shaped renal infarction. * **Option D:** The renal artery typically divides into **five segmental arteries** (Superior, Anterosuperior, Anteroinferior, Inferior, and Posterior) at or before the hilum. **3. High-Yield Clinical Pearls** * **Brodel’s Line:** A relatively avascular plane on the lateral border of the kidney between the anterior and posterior segmental artery distributions, used for surgical access (nephrolithotomy). * **Nutcracker Syndrome:** Compression of the left renal vein between the SMA and the Abdominal Aorta. * **Sequence of Branching:** Renal Artery → Segmental → Lobar → Interlobar → Arcuate → Interlobular → Afferent Arteriole [1].

Question 669: The left renal vein crosses the aorta at which level?

A. Posteriorly at the level of the superior mesenteric artery
B. Anteriorly above the level of the superior mesenteric artery
C. Anteriorly below the level of the superior mesenteric artery (Correct Answer)
D. Anteriorly below the inferior mesenteric artery

Explanation: ### Explanation **1. Why Option C is Correct:** The left renal vein (LRV) is significantly longer than the right renal vein because it must cross the midline to reach the Inferior Vena Cava (IVC). Anatomically, the LRV passes **anteriorly** to the abdominal aorta. Crucially, it is situated in the acute angle formed between the **Abdominal Aorta** (posteriorly) and the **Superior Mesenteric Artery (SMA)** (anteriorly). Since the SMA originates from the aorta at the L1 level and descends over the vein, the LRV lies immediately **below** the origin of the SMA. **2. Why Other Options are Incorrect:** * **Option A:** The LRV passes **anterior** to the aorta, not posterior. A "retro-aortic" left renal vein is a known anatomical variation but is not the standard anatomy. * **Option B:** The LRV lies **inferior** (below) to the origin of the SMA. If it were above, it would be compressed by the celiac trunk. * **Option D:** The Inferior Mesenteric Artery (IMA) originates much lower (at the L3 level). The LRV is related to the L1-L2 vertebral level, far above the IMA. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Nutcracker Syndrome:** This occurs when the LRV is compressed between the SMA and the Aorta (the "nutcracker" effect). Clinical features include hematuria, left-sided flank pain, and left-sided varicocele in males (due to backup of pressure into the left gonadal vein). * **Venous Drainage:** Unlike the right side, the **left gonadal vein** and **left suprarenal vein** drain into the left renal vein rather than directly into the IVC [1]. * **Surgical Landmark:** During abdominal aortic aneurysm (AAA) repair, the LRV is a key landmark for identifying the renal arteries [2].

Question 670: A 20-year-old male presents with repeated episodes of hematemesis. There is no history of jaundice or liver decompensation. On examination, significant findings include splenomegaly (8 cm below the costal margin) and the presence of esophageal varices. There is no ascites or peptic ulceration. The liver function tests are normal. What is the most likely diagnosis?

A. Extrahepatic portal venous obstruction
B. Non-cirrhotic portal fibrosis (Correct Answer)
C. Cirrhosis
D. Hepatic venous outflow tract obstruction

Explanation: ### Explanation The clinical presentation describes a young patient with **Portal Hypertension** (splenomegaly and esophageal varices) but with **preserved liver function** (normal LFTs, no jaundice, no ascites). This combination points toward a pre-sinusoidal cause of portal hypertension [1]. **1. Why Non-Cirrhotic Portal Fibrosis (NCPF) is Correct:** NCPF is a common cause of portal hypertension in developing countries. It is characterized by periportal fibrosis and sclerosis of the small branches of the portal vein. * **Key Features:** Massive splenomegaly and recurrent variceal bleeding in a patient who appears otherwise healthy [1]. * **Liver Function:** Since the pathology is pre-sinusoidal, the hepatocytes remain functional, leading to normal LFTs and the absence of stigmata of chronic liver disease (like jaundice or hepatic encephalopathy). **2. Why the Other Options are Incorrect:** * **Extrahepatic Portal Venous Obstruction (EHPVO):** While it also presents with normal LFTs and splenomegaly, it typically occurs in children (often with a history of neonatal umbilical sepsis). In adults, NCPF is a more frequent diagnosis for this presentation unless portal vein thrombosis is specifically mentioned. * **Cirrhosis:** This is ruled out by the **normal LFTs** and the absence of jaundice or ascites. Cirrhosis is a sinusoidal cause of portal hypertension where liver synthetic function is invariably compromised [1]. * **Hepatic Venous Outflow Tract Obstruction (Budd-Chiari Syndrome):** This is a post-sinusoidal obstruction. It typically presents with a classic triad of abdominal pain, hepatomegaly, and **ascites**, which are absent in this case. **3. NEET-PG High-Yield Pearls:** * **NCPF vs. EHPVO:** In EHPVO, the portal vein is replaced by a cluster of collaterals called a **"Portal Cavernoma"** on ultrasound. In NCPF, the main portal vein is usually patent. * **Schistosomiasis:** Globally, this is the most common cause of non-cirrhotic portal hypertension, but in the Indian context, NCPF is the classic exam answer. * **Management:** Patients with NCPF tolerate variceal bleeds much better than cirrhotics because their underlying liver reserve is excellent.

Practice by Chapter

Anterior Abdominal Wall

Practice Questions

Peritoneum and Peritoneal Cavity

Practice Questions

Stomach and Intestines

Practice Questions

Liver, Gallbladder and Biliary Tract

Practice Questions

Pancreas and Spleen

Practice Questions

Kidneys and Suprarenal Glands

Practice Questions

Abdominal Vasculature

Practice Questions

Posterior Abdominal Wall

Practice Questions

Innervation of Abdominal Viscera

Practice Questions

Applied Anatomy and Clinical Correlations

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free

Abdomen — MCQs

Abdomen — MCQs

On this page

Practice by Chapter

Want unlimited practice?