Inflammatory bowel disease UK Medical PG Practice Questions and MCQs
Practice UK Medical PG questions for Inflammatory bowel disease. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Inflammatory bowel disease UK Medical PG Question 1: A 38-year-old woman presents with recurrent episodes of severe abdominal pain and psychiatric symptoms. Her urine turns dark during attacks. Family history reveals similar episodes. What is the inheritance pattern?
- A. Autosomal recessive
- B. Autosomal dominant (Correct Answer)
- C. X-linked recessive
- D. X-linked dominant
- E. Mitochondrial
Inflammatory bowel disease Explanation: ***Autosomal dominant***
- The clinical picture of recurrent severe abdominal pain, psychiatric symptoms, and dark urine during attacks is highly suggestive of **Acute Intermittent Porphyria (AIP)**.
- AIP is caused by a deficiency in **hydroxymethylbilane synthase (PBG deaminase)** and is inherited in an **autosomal dominant** fashion, which explains the positive family history.
*Autosomal recessive*
- **Autosomal recessive** disorders typically manifest if two copies of the defective gene are inherited, often presenting in siblings but not consistently across multiple generations (vertical transmission) as implied by the family history.
- Conditions like **Congenital erythropoietic porphyria** are autosomal recessive but primarily cause photosensitivity and hemolytic anemia, not neurovisceral crises.
*X-linked recessive*
- **X-linked recessive** disorders predominantly affect males and are transmitted from carrier mothers to sons, a pattern inconsistent with a female patient with similar episodes in the family.
- Common examples like **Hemophilia** or **Duchenne Muscular Dystrophy** have sex-linked inheritance patterns that do not match the presented symptoms or inheritance.
*X-linked dominant*
- **X-linked dominant** inheritance would show affected fathers passing the trait to all daughters but none of their sons, and affected mothers passing it to half of their children, which is not the typical pattern for AIP.
- **X-linked protoporphyria**, a rare porphyria, follows this pattern but presents primarily with severe photosensitivity and hepatobiliary complications, not the neurovisceral attacks seen here.
*Mitochondrial*
- **Mitochondrial inheritance** is characterized by exclusive **maternal transmission**, meaning all children of an affected mother are affected, but no children of an affected father. This pattern differs from the general family history for AIP.
- Mitochondrial disorders primarily affect high-energy-demand organs, and while they can have neurological components, most porphyrias are nuclear-encoded genetic disorders, making mitochondrial inheritance highly unlikely.
Inflammatory bowel disease UK Medical PG Question 2: A 47-year-old man presents with acute severe abdominal pain and vomiting. He has a family history of similar episodes. Serum amylase is normal but urinary porphobilinogen is elevated. What triggers should be avoided?
- A. Fasting
- B. Alcohol
- C. Barbiturates
- D. Stress
- E. All of the above (Correct Answer)
Inflammatory bowel disease Explanation: ***All of the above***- The patient's presentation with acute severe abdominal pain, vomiting, family history of similar episodes, normal serum amylase, and elevated **urinary porphobilinogen** strongly points to an **Acute Intermittent Porphyria (AIP)** attack.- Attacks are triggered by factors that induce **hepatic ALA synthase (ALAS1)**, including specific drugs (e.g., **barbiturates**), metabolic stress (e.g., **fasting**, **alcohol**), and physiological factors (e.g., **stress**), all of which decrease regulatory heme. *Fasting*- **Fasting** or significant caloric restriction is a major trigger because the resulting carbohydrate deficiency reduces heme synthesis.- This leads to de-repression of **hepatic ALA synthase (ALAS1)**, increasing the production of neurotoxic porphyrin precursors.*Alcohol*- **Alcohol** metabolism induces **cytochrome P450 enzymes**, consuming available hepatic heme.- This consumption reduces the feedback inhibition on **ALAS1**, leading to an increase in porphyrin precursors.*Barbiturates*- **Barbiturates** are well-known inducers of the **hepatic cytochrome P450 system**.- This induction rapidly depletes the hepatic heme pool, lifting the natural feedback inhibition on **ALAS1** and causing accumulation of toxic precursors like **ALA** and **PBG**.*Stress*- Both emotional and physical **stress**, as well as infections, are recognized non-pharmacological precipitants of acute porphyria attacks.- Stress-induced attacks are likely mediated by associated hormonal shifts and metabolic imbalances that disrupt the heme synthesis pathway.
Inflammatory bowel disease UK Medical PG Question 3: A 51-year-old woman presents with progressive dysphagia and weight loss. She has a history of Barrett's esophagus on surveillance. Upper endoscopy shows a stricturing lesion. What is the most appropriate next step?
- A. Barium swallow
- B. Multiple biopsies of the lesion (Correct Answer)
- C. CT chest and abdomen
- D. Endoscopic ultrasound
- E. PET scan
Inflammatory bowel disease Explanation: ***Multiple biopsies of the lesion***- Given the history of **Barrett's esophagus** and progressive symptoms (**dysphagia**, **weight loss**), the stricturing lesion is highly suspicious for **esophageal adenocarcinoma**.- Obtaining **multiple tissue samples** is the definitive and most crucial first step to confirm the diagnosis, determine the histology, and guide all subsequent staging and treatment decisions.*Barium swallow*- While useful for evaluating the extent and geometry of the stricture, it is a **radiological technique** that cannot provide definitive **tissue diagnosis** (histology).- Utilizing a barium swallow as the next step would unnecessarily delay the required pathological confirmation of suspected **malignancy**.*CT chest and abdomen*- This is a crucial modality used for **staging** the disease (checking for distant metastases and large lymph nodes), which is performed *after* the cancer diagnosis is pathologically confirmed.- The information provided by the CT scan is necessary for determining the overall **stage** (M-stage) and defining the appropriate treatment strategy.*Endoscopic ultrasound*- EUS is critical for highly accurate local staging, specifically determining the depth of tumor invasion (**T stage**) and the status of regional lymph nodes (**N stage**).- Like the CT scan, EUS is a **staging tool** and follows the confirmed diagnosis provided by the initial biopsies.*PET scan*- The **PET scan** is useful for assessing metabolically active tumors and is used in staging to look for subtle or distant foci of metastases which may be missed on conventional CT.- This expensive and advanced imaging technique is reserved for **advanced staging** scenarios, typically after the diagnosis is confirmed and initial staging is underway.
Inflammatory bowel disease UK Medical PG Question 4: A 43-year-old woman presents with episodes of flushing, diarrhea, and bronchospasm. CT shows liver metastases and a small bowel mass. 24-hour urine 5-HIAA is markedly elevated. What is the primary tumor location?
- A. Appendix
- B. Small bowel (Correct Answer)
- C. Pancreas
- D. Lung
- E. Ovary
Inflammatory bowel disease Explanation: ***Small bowel*** - The constellation of **flushing**, **diarrhea**, and **bronchospasm** strongly indicates **carcinoid syndrome**, which, in the presence of **liver metastases**, is most commonly caused by **midgut carcinoid tumors**, particularly those arising from the **distal ileum**. - **Liver metastases** are crucial as they allow **serotonin** and other vasoactive substances to bypass hepatic metabolism, leading to systemic symptoms and elevated urinary **5-HIAA**. *Appendix* - While the **appendix** is the most common site for gastrointestinal carcinoid tumors, they are typically small, benign, and rarely metastasize or cause the full-blown **carcinoid syndrome**. - Appendiceal carcinoids are usually found incidentally and only cause symptoms if they obstruct the lumen. *Pancreas* - Pancreatic neuroendocrine tumors (PNETs) are known to secrete various hormones, but they typically cause syndromes related to hormones like **insulin** (insulinoma) or **gastrin** (gastrinoma), rather than classic carcinoid syndrome with prominent flushing and diarrhea. - Although a pancreatic primary could theoretically cause carcinoid syndrome, the clear presence of a **small bowel mass** on CT makes a small bowel primary significantly more likely. *Lung* - **Bronchial carcinoids** can indeed cause carcinoid syndrome, sometimes presenting with more atypical or prolonged flushing. - However, the patient's CT scan explicitly reveals a **small bowel mass** as the likely primary, making a lung primary less probable in this specific scenario. *Ovary* - Primary ovarian carcinoids are rare tumors that can cause carcinoid syndrome because their venous drainage directly enters the systemic circulation, bypassing the liver. - Yet, the identification of a **small bowel mass** on CT strongly points to a gastrointestinal primary tumor rather than an ovarian origin.
Inflammatory bowel disease UK Medical PG Question 5: A 54-year-old man presents with progressive dysphagia to solids over 3 months. He has a 40-year history of heartburn. Upper endoscopy shows a stricturing lesion at the GE junction. What is the most likely diagnosis?
- A. Benign peptic stricture
- B. Esophageal adenocarcinoma (Correct Answer)
- C. Achalasia
- D. Eosinophilic esophagitis
- E. Esophageal web
Inflammatory bowel disease Explanation: ***Esophageal adenocarcinoma***- The combination of a **long-standing history of GERD** (heartburn for 40 years) and the finding of a **stricturing lesion at the GE junction** is highly consistent with esophageal adenocarcinoma arising from **Barrett's esophagus**.- The presentation of **progressive dysphagia primarily to solids** over a short period (3 months) is the classic warning sign for malignancy causing luminal obstruction.*Benign peptic stricture*- While caused by chronic GERD, benign peptic strictures usually develop significantly **more slowly** (over years) and often cause symmetric, smooth narrowing.- Unlike cancer, benign strictures typically present with dysphagia that may improve with **proton pump inhibitor (PPI) therapy**, and they lack the invasive, irregular appearance of a malignant stricture on endoscopy.*Achalasia*- Achalasia is a motility disorder characterized by the failure of the **lower esophageal sphincter (LES) to relax**, typically causing progressive dysphagia to **both solids and liquids** simultaneously.- Endoscopy in achalasia usually shows a dilated esophagus with retained food, often with a "bird-beak" appearance on barium swallow, not a focal stricturing mass at the GE junction.*Eosinophilic esophagitis*- This condition is usually associated with **atopy** and presents with intermittent dysphagia, often leading to **food impaction**, typically in younger patients.- Endoscopic findings include characteristic **esophageal rings (trachea-like appearance)**, linear furrows, or white exudates, and the diagnosis relies on the presence of high numbers of eosinophils on biopsy.*Esophageal web*- Esophageal webs are thin, shelf-like mucosal membranes commonly found in the **proximal or mid esophagus**, often causing only intermittent, non-progressive dysphagia.- They are not associated with long-standing GERD/Barrett's esophagus, nor do they typically present as a thick, stricturing lesion found at the **GE junction**.
Inflammatory bowel disease UK Medical PG Question 6: A 52-year-old man presents with progressive jaundice and weight loss. MRCP shows stricturing of the common bile duct with upstream dilatation. CA 19-9 is markedly elevated. What is the most likely diagnosis?
- A. Choledocholithiasis
- B. Cholangiocarcinoma (Correct Answer)
- C. Pancreatic adenocarcinoma
- D. Primary sclerosing cholangitis
- E. Chronic pancreatitis
Inflammatory bowel disease Explanation: ***Cholangiocarcinoma***- This presentation of progressive **obstructive jaundice**, **weight loss**, and a solitary stricture on MRCP is highly characteristic of **cholangiocarcinoma**.- The markedly elevated **CA 19-9** is a standard tumor marker supporting the diagnosis of this biliary tract malignancy.*Choledocholithiasis*- Typically causes abrupt or **intermittent obstructive symptoms** (jaundice, cholangitis), often preceded by biliary colic.- MRCP would characteristically show **filling defects (stones)** within the duct, not primarily a **dominant intrinsic stricture**.*Pancreatic adenocarcinoma*- While it causes obstructive jaundice and weight loss with high CA 19-9, it usually compresses the **distal CBD** and often shows a **double duct sign** (dilated CBD and pancreatic duct).- The patient’s presentation focuses on a generic common bile duct stricture, which is more specific to biliary wall cancer (cholangiocarcinoma) than pancreatic head mass.*Primary sclerosing cholangitis*- Characterized by **multiple, diffuse, segmental strictures** alternating with normal duct segments, giving a **beaded appearance**.- This condition is an autoimmune process commonly associated with **ulcerative colitis**, not typically presenting as a solitary, malignant-appearing stricture.*Chronic pancreatitis*- Primary symptoms often include chronic severe **epigastric pain** and signs of **exocrine insufficiency** (steatorrhea) preceding jaundice.- Although it can cause benign strictures leading to jaundice, massive elevation of **CA 19-9** pointing to malignancy is rare without concurrent transformation (which would then be adenocarcinoma).
Inflammatory bowel disease UK Medical PG Question 7: A 41-year-old man presents with recurrent episodes of severe flushing and diarrhea. He develops bronchospasm during episodes. 5-HIAA is elevated. What is the primary tumor site likely to be?
- A. Lung
- B. Small bowel (Correct Answer)
- C. Pancreas
- D. Stomach
- E. Colon
Inflammatory bowel disease Explanation: ***Small bowel***- Midgut neuroendocrine tumors (NETs), typically originating in the **ileum**, are the most common source of metastases that produce the classic carcinoid syndrome (recurrent severe flushing, diarrhea, bronchospasm).- These tumors release large amounts of **serotonin**, which, when metastases bypass hepatic metabolism, causes systemic symptoms and elevates the urine excretion product, **5-HIAA**.*Lung*- Bronchial carcinoids can cause the syndrome, but the flushing is usually more **prolonged** and intense, and **carcinoid heart disease** is less common than with midgut tumors.- Primary lung tumors are less common than small bowel tumors to cause the full triad of severe flushing, profuse diarrhea, and bronchospasm.*Pancreas*- Pancreatic NETs, such as **insulinomas** or **gastrinomas**, typically cause syndromes related to their specific hormonal excess (e.g., hypoglycemia, peptic ulcers) rather than the classic serotonin-driven carcinoid syndrome.- While the pancreas can be a primary site, it is not the most likely cause of this specific generalized metastatic symptom constellation.*Stomach*- Gastric carcinoids often secrete **histamine**, leading to an atypical, often localized, flushing pattern, sometimes associated with specific dietary triggers.- This tumor site is less likely to produce the severe, systemic diarrhea and bronchospasm characteristic of a midgut serotonin-secreting tumor.*Colon*- Neuroendocrine tumors of the hindgut (colon and rectum), especially those in the rectum, rarely produce sufficient serotonin to cause the classic syndrome.- When colonic NETs do metastasize, they often present with local symptoms before generalized systemic signs of carcinoid syndrome appear.
Inflammatory bowel disease UK Medical PG Question 8: A 47-year-old woman presents with recurrent episodes of severe right upper quadrant pain after fatty meals. The pain radiates to her right shoulder. What is the most likely diagnosis?
- A. Peptic ulcer disease
- B. Acute pancreatitis
- C. Biliary colic (Correct Answer)
- D. Appendicitis
- E. Gastroenteritis
Inflammatory bowel disease Explanation: ***Biliary colic*** - This pain pattern, defined as recurrent **severe right upper quadrant pain** occurring post-prandially (especially after fatty meals), is the hallmark of symptomatic **cholelithiasis** (gallstones). - Pain radiation to the **right shoulder** or back (due to irritation of the **diaphragm** via the phrenic nerve) is characteristic of biliary pathology. *Peptic ulcer disease* - Pain is typically localized to the epigastrium and described as gnawing or burning, often related to the timing of meals but not specifically triggered episodically by fatty foods. - Radiation to the right shoulder is uncommon, and the primary complaint often includes symptoms like dyspepsia or early satiety. *Acute pancreatitis* - Characterized by severe, constant **epigastric pain** that typically radiates straight through to the back, rather than the right shoulder. - Pancreatitis pain is usually sustained, lasting days, and associated with elevated **lipase** and **amylase**, not short-lived episodes like colic. *Appendicitis* - Classically presents with periumbilical pain migrating to the **right lower quadrant (RLQ)**, sometimes associated with fever and leukocytosis. - **Right upper quadrant (RUQ)** pain radiating to the shoulder is not consistent with the clinical picture of acute appendicitis. *Gastroenteritis* - Presents with generalized abdominal cramping, vomiting, and diarrhea, typically indicative of an infectious process. - It does not cause the severe, localized **RUQ pain** precisely triggered by fatty meal consumption described in this patient.
Inflammatory bowel disease UK Medical PG Question 9: A 39-year-old woman presents with recurrent episodes of severe abdominal pain and nausea. Her urine turns dark during attacks. She has a family history of similar symptoms. What should be avoided?
- A. Carbohydrates
- B. Barbiturates (Correct Answer)
- C. Antibiotics
- D. Analgesia
- E. IV fluids
Inflammatory bowel disease Explanation: ***Barbiturates***
- **Barbiturates** are potent inducers of hepatic **cytochrome P450 enzymes**, which significantly increase the synthesis of neurotoxic porphyrin precursors (like **ALA** and **PBG**).
- This increased porphyrin synthesis precipitates acute neurovisceral attacks in **Acute Intermittent Porphyria (AIP)**, making barbiturates strictly contraindicated.
*Carbohydrates*
- High-dose intravenous **glucose** (a complex carbohydrate) is standard initial management for the acute attack, as it suppresses **hepatic ALA synthase** activity.
- Avoiding carbohydrates or prolonged **fasting** actually reduces the suppression of porphyrin synthesis, thereby potentially precipitating or worsening an attack.
*Antibiotics*
- While specific antibiotics (like **sulfonamides** and **griseofulvin**) must be avoided, the entire class is not contraindicated if an infection is suspected or confirmed.
- Clinicians utilize known **porphyria-safe** antibiotics to treat necessary infections without precipitating an attack.
*Analgesia*
- Severe **abdominal pain** is a cardinal feature of the acute porphyria attack, necessitating aggressive pain management, often requiring **opioids**.
- Avoiding necessary analgesia is unethical and secondary to treatment; non-precipitating analgesics like fentanyl or morphine are generally used.
*IV fluids*
- **IV fluids** are essential supportive measures, necessary for managing severe vomiting, dehydration, and correcting potential **hyponatremia** (often due to SIADH) seen during acute attacks.
- Maintaining hydration and electrolyte balance is vital for patient stabilization during an attack.
Inflammatory bowel disease UK Medical PG Question 10: A 48-year-old man presents with acute severe epigastric pain radiating to his back. CT shows pancreatic necrosis involving >60% of the gland. What is the most appropriate management?
- A. Immediate surgery
- B. Conservative management with IV fluids (Correct Answer)
- C. Endoscopic necrosectomy
- D. Percutaneous drainage
- E. Total pancreatectomy
Inflammatory bowel disease Explanation: ***Conservative management with IV fluids***- This is the cornerstone of initial management for severe acute pancreatitis, even when extensive necrosis (>60%) is present, as most necrosis is **sterile** initially.- Initial care focuses on aggressive **intravenous fluid resuscitation** to maintain vital organ perfusion, manage pain, and provide nutritional support. *Immediate surgery*- Early surgical debridement (within the first few weeks) for acute necrotizing pancreatitis dramatically increases **morbidity and mortality** and is generally contraindicated.- Surgery is reserved for patients with suspected or proven **infected necrosis** who fail to improve after 4 or more weeks of conservative management (the step-up approach). *Endoscopic necrosectomy*- This technique is part of the preferred **step-up approach** for managing **walled-off pancreatic necrosis (WOPN)**, generally weeks after the initial presentation.- It is an interventional management option, not the initial acute step, and is primarily indicated for symptomatic or infected collections. *Percutaneous drainage*- **Percutaneous drainage** is typically the initial intervention used within the minimally invasive (step-up) management of *infected* necrosis or fluid collections.- Like necrosectomy, it is performed later in the disease course, often after the first 3-4 weeks, and is not the appropriate **initial management** upon presentation. *Total pancreatectomy*- Total pancreatectomy is considered only in dire, localized circumstances, such as uncontrollable hemorrhage or failure of all other management strategies (medical and interventional).- This aggressive surgery results in permanent **diabetes mellitus** and exocrine insufficiency, making it an unacceptable choice for initial treatment.
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