Acute Abdomen Imaging Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Acute Abdomen Imaging. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Acute Abdomen Imaging Indian Medical PG Question 1: Ultrasound is the investigation of choice for
- A. Somatostatinoma
- B. Intraductal Pancreatic calculi
- C. Urethral stricture
- D. Blunt abdominal trauma (Correct Answer)
Acute Abdomen Imaging Explanation: ***Blunt abdominal trauma***
- **Focused Assessment with Sonography for Trauma (FAST) exam** is the initial imaging modality of choice for rapidly detecting **intra-abdominal free fluid** (hemoperitoneum) in hemodynamically unstable patients with blunt abdominal trauma due to its speed, portability, and non-invasiveness.
- It helps guide the need for further imaging or surgical intervention, making it critical in the acute setting.
*Somatostatinoma*
- Diagnosed primarily through biochemical tests (elevated **somatostatin levels**) and imaging like **CT, MRI, or somatostatin receptor scintigraphy (SRS)**, which are superior for localizing these rare neuroendocrine tumors.
- Although ultrasound can sometimes detect pancreatic masses, it is not the **investigation of choice** for definitive diagnosis or staging of somatostatinomas.
*Intraductal Pancreatic calculi*
- Often best visualized with **Endoscopic Retrograde Cholangiopancreatography (ERCP)** or **Magnetic Resonance Cholangiopancreatography (MRCP)**, which provide detailed imaging of the pancreatic and bile ducts.
- While transabdominal ultrasound can sometimes detect dilated ducts or large calculi, **Endoscopic Ultrasound (EUS)** is more sensitive and specific for intraductal pathologies, making routine transabdominal ultrasound not the primary choice.
*Urethral stricture*
- The gold standard for diagnosing urethral strictures is **urethrography** (retrograde urethrogram), which directly visualizes the stricture and its extent.
- While ultrasound can sometimes be used to assess the urethra, it is less effective than urethrography for defining the length and severity of a stricture.
Acute Abdomen Imaging Indian Medical PG Question 2: What is the investigation of choice for blunt abdominal trauma in an unstable patient?
- A. X-ray abdomen
- B. MRI
- C. USG (Correct Answer)
- D. Diagnostic Peritoneal Lavage (DPL)
Acute Abdomen Imaging Explanation: ***USG (FAST Exam)***
- In an **unstable patient** with blunt abdominal trauma, **Focused Assessment with Sonography for Trauma (FAST) exam** is the investigation of choice.
- It is **rapid, non-invasive, and bedside**, allowing immediate detection of **free fluid** (blood) in the peritoneal cavity, pericardium, and pleural spaces without transporting the patient.
- Guides immediate decision for **laparotomy** in hemodynamically unstable patients.
- **Note:** In **stable patients**, **CT abdomen** is the gold standard as it provides detailed anatomical information, but it requires patient transport and time.
*X-ray abdomen*
- Provides limited information in blunt trauma, primarily showing **free air** (bowel perforation) or **bony fractures**.
- **Not sensitive** for detecting intraperitoneal bleeding, which is the primary concern in unstable patients.
*MRI*
- Offers excellent soft tissue detail but is **time-consuming** and requires the patient to be **hemodynamically stable**.
- **Impractical** for unstable trauma patients requiring rapid assessment and intervention.
*Diagnostic Peritoneal Lavage (DPL)*
- An **invasive procedure** that is sensitive for detecting intra-abdominal hemorrhage.
- Has largely been **replaced by FAST exam** in most trauma centers due to FAST being non-invasive, rapid, and repeatable.
- DPL has a **higher false-positive rate** and cannot identify the source of bleeding.
Acute Abdomen Imaging Indian Medical PG Question 3: Most sensitive investigation for abdominal trauma in a hemodynamically stable patient is-
- A. Ultrasonography (FAST)
- B. Diagnostic peritoneal lavage (DPL)
- C. MRI (Magnetic Resonance Imaging)
- D. CT Scan (Computed Tomography) (Correct Answer)
Acute Abdomen Imaging Explanation: ***CT Scan (Computed Tomography)***
- **CT scans** offer superior anatomical detail and can accurately detect organ damage, hemorrhage, and other injuries in **hemodynamically stable** patients with abdominal trauma.
- It is considered the **most sensitive** and specific imaging modality for evaluating blunt and penetrating abdominal trauma when the patient can tolerate the study.
*Ultrasonography (FAST)*
- While effective for detecting **free fluid** (blood) in specific abdominal areas, **Focused Assessment with Sonography for Trauma (FAST)** has lower sensitivity for solid organ injuries or bowel perforations.
- Its primary role is rapid assessment for **hemoperitoneum** to guide immediate management in unstable patients, not detailed injury characterization.
*Diagnostic peritoneal lavage (DPL)*
- **DPL** is an invasive procedure with high sensitivity for detecting **intraperitoneal bleeding**, but it does not identify specific organ injuries or retroperitoneal hemorrhage.
- It is rarely used in hemodynamically stable patients due to its invasiveness and the availability of more detailed imaging techniques.
*MRI (Magnetic Resonance Imaging)*
- **MRI** provides excellent soft tissue contrast but is typically too **time-consuming** and less accessible in urgent trauma settings compared to CT.
- It's generally not the first-line investigation for acute abdominal trauma due to motion artifacts and limited utility in detecting air or bone injuries.
Acute Abdomen Imaging Indian Medical PG Question 4: The "Target sign" ultrasonographically means:
- A. Liver metastasis
- B. Ectopic kidney
- C. Intussusception (Correct Answer)
- D. Ovarian carcinoma
Acute Abdomen Imaging Explanation: ***Intussusception***
- The **"target sign"** (also known as the **"donut sign"** or **"pseudokidney sign"**) on ultrasound is a classic finding for **intussusception**.
- It represents concentric layers of bowel telescoping into an adjacent segment, creating a central hyperechoic core surrounded by hypoechoic rings.
*Liver metastasis*
- Liver metastases often appear as **hypoechoic, hyperechoic, or mixed echogenicity lesions** on ultrasound, and vary widely in appearance.
- While some can have a "target-like" appearance with a hyperechoic rim, it's not the primary or most specific sign for liver metastasis and is less distinct than in intussusception.
*Ectopic kidney*
- An ectopic kidney is an anatomical variant where the kidney is located outside its normal position, most commonly in the **pelvis**.
- On ultrasound, it would appear as a normally formed kidney in an atypical location, without the distinct concentric layers seen in the "target sign."
*Ovarian carcinoma*
- Ovarian carcinomas present with **complex masses** that can be solid, cystic, or mixed, often with septations, papillary projections, and areas of necrosis.
- Their ultrasound appearance is highly variable but does not typically manifest as a "target sign" with concentric rings.
Acute Abdomen Imaging Indian Medical PG Question 5: In a patient with a tender and rigid abdomen, what is the expected finding on X-ray?
- A. Blood under the diaphragm
- B. Air under the diaphragm (Correct Answer)
- C. Hazy lung fields
- D. Prominent vascular markings
Acute Abdomen Imaging Explanation: ***Air under the diaphragm***
- The presence of **free air** (pneumoperitoneum) beneath the diaphragm on an upright abdominal X-ray is a classic sign of **visceral perforation**.
- A **tender and rigid abdomen** (peritoneal signs) indicates irritation of the peritoneum, most commonly due to a ruptured hollow viscus.
*Blood under the diaphragm*
- While blood can accumulate under the diaphragm (e.g., from **trauma** or a ruptured ectopic pregnancy), it typically manifests as a **hemoperitoneum** on imaging.
- Blood is **fluid** and would appear as a fluid collection, not free air, on X-ray.
*Hazy lung fields*
- **Hazy lung fields** suggest conditions like **pulmonary edema**, pneumonia, or acute respiratory distress syndrome (ARDS).
- These findings are primarily associated with pulmonary pathology and are not directly indicative of an acute abdominal emergency like perforation.
*Prominent vascular markings*
- **Prominent vascular markings** often indicate increased blood flow to the lungs or **pulmonary hypertension**.
- This finding is unrelated to acute abdominal pain or peritoneal irritation.
Acute Abdomen Imaging Indian Medical PG Question 6: Identify the condition based on the non-contrast CT scan of a patient given below.
- A. Hepatocellular carcinoma
- B. Hydatid cyst (Correct Answer)
- C. Liver abscess
- D. Focal nodular hyperplasia
Acute Abdomen Imaging Explanation: ***Hydatid cyst***
- The image distinctly shows a **large, well-defined cyst with internal septations**, consistent with the daughter cysts and collapsed membranes within a hydatid cyst (the "**water lily sign**").
- The thick, often calcified wall surrounding the lesion is a characteristic feature often seen in **Echinococcus granulosa** infection.
*Hepatocellular carcinoma*
- **Hepatocellular carcinoma (HCC)** typically appears as a **solid, enhancing mass** (especially on contrast-enhanced CT) and does not usually present with clearly defined internal septations or "water lily" sign on non-contrast imaging.
- While HCC can show necrosis, it does not form the characteristic cystic structure seen here.
*Liver abscess*
- A **liver abscess** would typically appear as a ill-defined, fluid-filled lesion that may have a rim of enhancement on contrast CT, but it generally lacks the **distinct internal septations** or daughter cysts characteristic of a hydatid cyst.
- Abscesses are often associated with signs of infection like fever and elevated inflammatory markers.
*Fibronodular hyperplasia*
- **Focal nodular hyperplasia (FNH)** is a benign liver lesion characterized by a central scar and is typically **isodense or slightly hypodense** to the liver parenchyma on non-contrast CT.
- It does not present as a cystic lesion with internal daughter cysts or calcified walls.
Acute Abdomen Imaging Indian Medical PG Question 7: Gas absent from intestine (gasless abdomen) on x-ray is seen in which condition?
- A. Ulcerative colitis
- B. Intussusception
- C. Acute pancreatitis (Correct Answer)
- D. Necrotizing enterocolitis
Acute Abdomen Imaging Explanation: ***Acute pancreatitis***
- In **severe acute pancreatitis**, a **gasless or relatively gasless abdomen** may be seen due to profound **ileus** with fluid accumulation displacing intestinal gas.
- The marked inflammatory process can lead to complete loss of intestinal motility and fluid sequestration (third-spacing), resulting in minimal visible bowel gas on X-ray.
- **Note**: Classic signs include **sentinel loop sign** (dilated jejunal loop) or **colon cut-off sign**, but in severe cases with massive ascites or fluid collections, a gasless pattern may occur.
*Ulcerative colitis*
- Typically presents with **dilated loops of large bowel** with visible gas and **toxic megacolon** in severe cases.
- Inflammatory changes cause bowel wall thickening, but gas is usually **present and often increased**.
*Intussusception*
- May show a **target sign** or **meniscus sign** on imaging, with bowel loops dilated proximal to the obstruction.
- Gas is typically **present** within the bowel or proximal to the invagination, not absent from the entire abdomen.
*Necrotizing enterocolitis*
- Characterized by **pneumatosis intestinalis** (gas in the bowel wall) and **portal venous gas**, features directly contradicting a gasless abdomen.
- Shows dilated loops with gas and evidence of bowel wall necrosis - **gas is prominently present**.
Acute Abdomen Imaging Indian Medical PG Question 8: Gasless abdomen seen in-
- A. Ulcerative colitis
- B. Acute pancreatitis (Correct Answer)
- C. Intussusception
- D. Necrotising enterocolitis
Acute Abdomen Imaging Explanation: ***Acute pancreatitis***
- A **gasless abdomen** on X-ray can be a finding in severe **acute pancreatitis** due to **ileus** (paralytic ileus secondary to inflammation), and the presence of significant peritoneal fluid or inflammation may obscure gas.
- The inflammatory process can lead to **adynamic ileus** affecting segments of the bowel, limiting gas accumulation.
*Ulcerative colitis*
- Often presents with **toxic megacolon** in severe cases, which would show a **dilated, gas-filled colon**, not a gasless abdomen.
- Inflammation is typically confined to the colon and does not usually lead to a widespread adynamic ileus that would result in a gasless appearance.
*Intussusception*
- While it can manifest as an **abdominal mass** and **bowel obstruction**, gas is typically present proximal to the obstruction.
- The classic X-ray finding is a **target sign** (telescoping bowel) or signs of **bowel obstruction**, which includes dilated loops of bowel with air-fluid levels.
*Necrotising enterocolitis*
- Characterized by **pneumatosis intestinalis** (gas in the bowel wall) and sometimes **portal venous gas**, indicating the presence of gas, not its absence.
- A sign of advanced disease, this condition involves gas within the bowel layers rather than a gasless abdomen.
Acute Abdomen Imaging Indian Medical PG Question 9: What is the investigation of choice for an 8-year-old child presenting with an acute abdomen?
- A. USG (Correct Answer)
- B. CT Scan
- C. X-ray
- D. MRI
Acute Abdomen Imaging Explanation: ***USG***
- An **ultrasound (USG)** is the preferred initial imaging modality in pediatric acute abdomen due to its **lack of ionizing radiation**, ease of use, and ability to visualize common causes like appendicitis and intussusception.
- It is particularly useful for assessing **fluid collections**, inflammation, and obstruction in a non-invasive manner suitable for children.
*CT Scan*
- While it offers detailed anatomical views, **CT scans** involve significant **ionizing radiation**, which is a concern in children due to increased lifetime cancer risk.
- It is typically reserved for cases where **USG is inconclusive** or if there is a high suspicion of conditions not well visualized by ultrasound.
*X-ray*
- **X-rays** provide limited information for soft tissue pathologies and are primarily useful for detecting **bowel obstruction (air-fluid levels)** or **free air** (perforation).
- They lack the resolution to diagnose many common causes of acute abdomen in children, such as appendicitis or intussusception.
*MRI*
- **MRI** provides excellent soft tissue contrast without ionizing radiation but often requires **sedation** in young children due to the long scan times and need for stillness.
- It is less readily available and more expensive than USG, making it a less practical first-line investigation for an acute presentation.
Acute Abdomen Imaging Indian Medical PG Question 10: A patient presents to the emergency department with pain and distension of abdomen and absolute constipation. What is the investigation of choice ?
- A. Plain X-ray abdomen (Erect) (Correct Answer)
- B. Ultrasonography
- C. Barium meal follow-through
- D. Colonoscopy
Acute Abdomen Imaging Explanation: ***Plain X-ray abdomen (Erect)***
- An erect plain X-ray of the abdomen is the initial and often diagnostic investigation for **bowel obstruction**, revealing **dilated bowel loops** and **air-fluid levels**.
- It helps confirm the presence of obstruction and can sometimes indicate its location and severity, though it does not provide information about the cause.
*Ultrasonography*
- While ultrasound can detect **bowel dilation** and **peristalsis**, it is limited in visualizing the entire bowel and cannot reliably differentiate between various causes of obstruction.
- It is more useful for assessing **extraluminal pathology** or **fluid collections** but less effective as a primary diagnostic tool for bowel obstruction.
*Barium meal follow-through*
- This study involves oral **barium administration** and serial X-rays to visualize the small bowel, but it is **contraindicated** in suspected bowel obstruction due to the risk of exacerbating the obstruction or causing **barium impaction**.
- Its primary role is in evaluating chronic or partial obstructions, or malabsorption, not acute presentations with complete obstruction.
*Colonoscopy*
- **Colonoscopy** is an invasive procedure primarily used for diagnosis and treatment of **colonic pathology**, such as polyps, strictures, or bleeding.
- It is **contraindicated** in acute, complete bowel obstruction due to the risk of **perforation** and is not the initial diagnostic choice for acute abdominal pain and absolute constipation.
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