Gastrointestinal Pathology — MCQs
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Endoscopy performed on a patient with persistent substernal pain despite antacid use demonstrates irregular erythematous patches several centimeters above the gastroesophageal junction. Biopsy of one of these lesions demonstrates epithelial metaplasia. Which of the following cell types was most likely observed in the involved areas?
All are true about Barrett's esophagus, EXCEPT?
A female patient presents with pigmentation of the lips and oral mucosa along with intestinal polyps. Her sister also presents with a similar history. What is the most probable diagnosis?
Linitis plastica is commonly seen in which of the following conditions?
Which of the following carries the least risk of colonic malignancy?
A 53-year-old woman presents with a 5-month history of nausea, vomiting, and mid-epigastric pain. Physical examination reveals no significant findings. An abdominal CT scan shows gastric outlet obstruction. Upper gastrointestinal endoscopy reveals an ulcerated, 2x4 cm bulky mass in the antrum at the pylorus, and a urease test is positive. Which of the following neoplasms is most likely to be identified in a biopsy specimen of this mass?
Linitis plastica is found in all except?
Which of the following is NOT a component of Carney's triad?
Helicobacter pylori has been implicated in all, except:
Which polyp has the maximum malignant potential?
Gastrointestinal Pathology Indian Medical PG Practice Questions and MCQs
Question 351: Endoscopy performed on a patient with persistent substernal pain despite antacid use demonstrates irregular erythematous patches several centimeters above the gastroesophageal junction. Biopsy of one of these lesions demonstrates epithelial metaplasia. Which of the following cell types was most likely observed in the involved areas?
- A. Ciliated columnar epithelium
- B. Cuboidal epithelium
- C. Keratinizing squamous epithelium
- D. Non-ciliated columnar epithelium (Correct Answer)
Explanation: ### Explanation **Concept Overview:** The clinical presentation of persistent substernal pain (heartburn) despite antacid use, combined with endoscopic findings of erythematous patches (often called "salmon-pink tongues") above the gastroesophageal junction, is diagnostic of **Barrett’s Esophagus**. This condition is a complication of chronic Gastroesophageal Reflux Disease (GERD) [1]. **Why the Correct Answer is Right:** In Barrett’s esophagus, the normal **non-keratinized stratified squamous epithelium** of the esophagus undergoes **metaplasia** to adapt to the acidic environment. It transforms into **non-ciliated columnar epithelium** with interspersed **Goblet cells** (intestinal metaplasia) [1]. This columnar epithelium is better equipped to secrete mucus and resist acid injury compared to the original squamous lining [1]. **Analysis of Incorrect Options:** * **A. Ciliated columnar epithelium:** This is characteristic of the respiratory tract (e.g., trachea/bronchi). It is not found in the GI tract metaplasia. * **B. Cuboidal epithelium:** This is typically found in glandular ducts or renal tubules; it is not the characteristic metaplastic change seen in the esophagus. * **C. Keratinizing squamous epithelium:** This is found in the skin (epidermis). While the normal esophagus is squamous, it is *non-keratinizing*. Keratinization would be an abnormal finding but is not the change associated with Barrett’s. **High-Yield NEET-PG Pearls:** * **Definition:** Barrett’s Esophagus is defined by the replacement of squamous mucosa with intestinal-type columnar epithelium [1]. * **Hallmark Histology:** The presence of **Goblet cells** is essential for the diagnosis of intestinal metaplasia in the esophagus [1]. * **Clinical Significance:** It is a **pre-malignant** condition, significantly increasing the risk of **Esophageal Adenocarcinoma** (not Squamous Cell Carcinoma) [1]. * **Endoscopy:** Normal esophageal mucosa is pale/glossy; Barrett’s appears as reddish, velvety "salmon-pink" mucosa extending proximally from the Z-line. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 348-349.
Question 352: All are true about Barrett's esophagus, EXCEPT?
- A. Specialised columnar metaplasia
- B. Major risk factor for adenocarcinoma of the esophagus
- C. Screening endoscopy is required in all patients with GERD symptoms (Correct Answer)
- D. Endoscopic biopsy is the gold standard for confirmation
Explanation: ### Explanation **Barrett’s Esophagus (BE)** is a complication of chronic Gastroesophageal Reflux Disease (GERD) where the normal stratified squamous epithelium of the esophagus is replaced by **specialized columnar epithelium** containing **Goblet cells** [1]. #### Why Option C is the Correct Answer (The "Except" Statement) While GERD is the primary driver of Barrett’s Esophagus, **screening endoscopy is NOT recommended for all patients with GERD symptoms.** Most patients with GERD will never develop BE or adenocarcinoma. Screening is reserved for "high-risk" patients: typically men over 50 with chronic (>5 years) symptoms and additional risk factors like obesity, smoking, or a family history of BE/adenocarcinoma. Barrett esophagus can only be identified through endoscopy and biopsy, which are usually prompted by GERD symptoms [1]. #### Analysis of Other Options * **Option A (Specialized Columnar Metaplasia):** This is the hallmark histological definition. The presence of intestinal-type Goblet cells (which stain blue with Alcian Blue at pH 2.5) is essential for the diagnosis of "specialized" metaplasia [1]. * **Option B (Risk Factor for Adenocarcinoma):** BE is a pre-malignant condition [2]. It follows a progression sequence: Metaplasia → Low-grade Dysplasia → High-grade Dysplasia → Adenocarcinoma. It increases the risk of esophageal adenocarcinoma by 30–40 fold [3]. * **Option D (Endoscopic Biopsy):** Endoscopy identifies "salmon-pink" tongues of mucosa extending above the gastroesophageal junction, but **histopathological confirmation via biopsy** is the gold standard to confirm metaplasia and rule out dysplasia [1]. ### High-Yield Clinical Pearls for NEET-PG * **Location:** Typically involves the distal third of the esophagus. * **Microscopy:** Look for **Goblet cells** (distended with mucus, clear/bluish on H&E) [1]. * **Pratt’s Criteria:** Endoscopic evidence of columnar-lined esophagus + Histological evidence of intestinal metaplasia. * **Management:** Patients with BE require periodic surveillance biopsies to monitor for dysplasia [1]. High-grade dysplasia often requires endoscopic mucosal resection or ablation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 764-765. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 348-349. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 765-766.
Question 353: A female patient presents with pigmentation of the lips and oral mucosa along with intestinal polyps. Her sister also presents with a similar history. What is the most probable diagnosis?
- A. Carcinoid tumor
- B. Melanoma
- C. Villous adenoma
- D. Peutz-Jeghers syndrome (Correct Answer)
Explanation: **Explanation:** The clinical presentation of **mucocutaneous pigmentation** (lips, oral mucosa, hands, and feet) combined with **multiple gastrointestinal polyps** and a positive family history is the classic triad for **Peutz-Jeghers Syndrome (PJS)** [1]. **1. Why Peutz-Jeghers Syndrome is correct:** PJS is an **Autosomal Dominant** disorder caused by a germline mutation in the **STK11 (LKB1)** gene on chromosome 19 [1]. The polyps are characteristically **hamartomatous**, showing a "Christmas tree" branching pattern of smooth muscle (arborization) on histology [1]. While the polyps themselves have low malignant potential, patients have a significantly increased risk of developing various cancers (colorectal, breast, pancreatic, and gynecological) [1]. **2. Why other options are incorrect:** * **Carcinoid tumor:** These are neuroendocrine tumors that present with "Carcinoid Syndrome" (flushing, diarrhea, wheezing) due to serotonin release, not mucocutaneous pigmentation. * **Melanoma:** While it involves pigment-producing cells, it presents as asymmetrical, irregular skin lesions or masses, not as a systemic syndrome with intestinal hamartomas. * **Villous adenoma:** These are neoplastic epithelial polyps (often in the rectum) known for causing secretory diarrhea and hypokalemia [1]. They are not associated with oral pigmentation. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant [1]. * **Gene:** STK11/LKB1 (Tumor suppressor gene) [1]. * **Histology:** "Arborizing" smooth muscle bundles (Diagnostic hallmark) [1]. * **Commonest Site:** Small intestine (Jejunum > Ileum > Duodenum) [1]. * **Most common complication:** Intussusception (due to large polyps acting as lead points). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 813-814.
Question 354: Linitis plastica is commonly seen in which of the following conditions?
- A. Carcinoma of the stomach (Correct Answer)
- B. Sarcoidosis
- C. Lymphoma
- D. Leiomyosarcoma
Explanation: **Explanation:** **Linitis plastica** (also known as "leather bottle stomach") is a morphological pattern most characteristically associated with **diffuse-type gastric adenocarcinoma** [1]. **1. Why Carcinoma of the Stomach is Correct:** In the Lauren classification of gastric cancer, the **diffuse type** is characterized by a lack of cell cohesion and the presence of **Signet ring cells** [1]. These cells infiltrate the gastric wall extensively, triggering a massive **desmoplastic reaction** (fibrosis). This results in a thickened, rigid, and non-distensible stomach wall that resembles a leather pouch [1]. Grossly, the rugal folds are flattened, and the stomach cannot be inflated during endoscopy [1]. **2. Why the Other Options are Incorrect:** * **Sarcoidosis:** While sarcoidosis can involve the stomach (granulomatous gastritis), it typically presents as small nodules or erosions, not the diffuse, rigid thickening seen in linitis plastica. * **Lymphoma:** Gastric lymphoma (mostly MALToma or DLBCL) usually presents as bulky, polypoid masses or deep ulcerations. While it can cause wall thickening, it lacks the intense desmoplasia required to produce the "leather bottle" appearance. * **Leiomyosarcoma:** This is a mesenchymal tumor that typically grows as a large, well-circumscribed intramural mass, often with central necrosis or ulceration, rather than a diffuse infiltrative process. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Look for **Signet ring cells** (nucleus pushed to the periphery by a large mucin vacuole) [1]. * **Genetics:** Often associated with mutations in the **CDH1 gene**, which encodes for **E-cadherin** [1]. * **Spread:** Diffuse gastric cancer is more likely to spread to the ovaries, forming a **Krukenberg tumor**. * **Radiology:** On a Barium swallow, it presents as a narrowed, rigid stomach with a "tubular" appearance. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 779-780.
Question 355: Which of the following carries the least risk of colonic malignancy?
- A. Familial adenomatous polyposis
- B. Gardner's syndrome
- C. Villous adenoma
- D. Peutz-Jeghers syndrome (Correct Answer)
Explanation: The risk of colonic malignancy is primarily determined by whether a polyp is **neoplastic** (adenomatous) or **non-neoplastic** (hamartomatous/inflammatory) [1]. **Why Peutz-Jeghers Syndrome (PJS) is the correct answer:** PJS is characterized by multiple **hamartomatous polyps** throughout the GI tract (most commonly the small intestine) [1]. Hamartomas are non-neoplastic overgrowths of mature native tissue. While PJS significantly increases the lifetime risk of *extra-intestinal* cancers (pancreas, breast, ovary) and has a small risk of colorectal cancer due to secondary changes, the polyps themselves are not inherently premalignant [1]. Compared to the other options, which involve adenomatous pathways, PJS carries the **least risk** of direct colonic malignancy. **Analysis of Incorrect Options:** * **Familial Adenomatous Polyposis (FAP):** An autosomal dominant condition (APC gene mutation) where patients develop thousands of adenomas [3]. The risk of colorectal cancer is **100%** by age 40 if untreated [3]. * **Gardner’s Syndrome:** A variant of FAP (associated with osteomas and soft tissue tumors). Like FAP, it carries a **100% risk** of malignancy. * **Villous Adenoma:** Among sporadic adenomas, the "Villous" architecture carries the **highest malignant potential** (up to 40-50%) compared to tubular or tubulovillous types [2]. **NEET-PG High-Yield Pearls:** * **Size and Histology:** The risk of malignancy in a polyp increases with size (>2 cm), villous architecture, and high-grade dysplasia [2]. * **PJS Triad:** Mucocutaneous hyperpigmentation (lips/buccal mucosa), hamartomatous polyps, and *STK11* (LKB1) gene mutation [1]. * **Turcot Syndrome:** FAP/HNPCC + CNS tumors (Medulloblastoma/Glioblastoma). Remember: **"T"**urcot = **"T"**urban (Head/CNS tumors). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 813-814. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 371-372. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 821-822.
Question 356: A 53-year-old woman presents with a 5-month history of nausea, vomiting, and mid-epigastric pain. Physical examination reveals no significant findings. An abdominal CT scan shows gastric outlet obstruction. Upper gastrointestinal endoscopy reveals an ulcerated, 2x4 cm bulky mass in the antrum at the pylorus, and a urease test is positive. Which of the following neoplasms is most likely to be identified in a biopsy specimen of this mass?
- A. Adenocarcinoma (Correct Answer)
- B. Leiomyosarcoma
- C. Neuroendocrine carcinoma
- D. Non-Hodgkin lymphoma
Explanation: **Explanation:** The clinical presentation describes a classic case of **Gastric Adenocarcinoma**, the most common primary gastric malignancy (accounting for >90% of cases). **Why Adenocarcinoma is correct:** 1. **Location and Morphology:** The antrum is the most common site for gastric adenocarcinoma [1]. An "ulcerated, bulky mass" causing gastric outlet obstruction is a hallmark of the **intestinal type** (Lauren classification) [1]. 2. **Risk Factor:** The **positive urease test** indicates a chronic *Helicobacter pylori* infection. *H. pylori* is a Group 1 carcinogen that leads to chronic atrophic gastritis and intestinal metaplasia, the precursor lesions for the intestinal type of gastric adenocarcinoma [2]. **Why the other options are incorrect:** * **Leiomyosarcoma:** These are rare mesenchymal tumors. While they can ulcerate, they are far less common than epithelial tumors and are not associated with *H. pylori*. * **Neuroendocrine Carcinoma:** These typically present as smaller, multiple nodules (carcinoids) [4] or aggressive small-cell-like masses, but they lack a strong association with *H. pylori*-induced ulceration. * **Non-Hodgkin Lymphoma (MALToma):** While *H. pylori* is a major risk factor for MALT lymphoma [3], these usually present as diffuse thickening of the gastric folds or multiple small ulcers rather than a single, large, obstructive bulky mass in the antrum. **High-Yield Pearls for NEET-PG:** * **Lauren Classification:** Divides gastric cancer into **Intestinal** (bulky, gland-forming, associated with *H. pylori*) and **Diffuse** (Signet ring cells, *linitis plastica*, associated with CDH1 mutation) [1], [2]. * **Virchow’s Node:** Left supraclavicular lymphadenopathy (Troisier sign) is a classic sign of metastatic gastric cancer. * **Sister Mary Joseph Nodule:** Periumbilical metastasis. * **Krukenberg Tumor:** Bilateral ovarian metastasis (usually from the diffuse type). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 779. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 779-780. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 356-357. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 780-781.
Question 357: Linitis plastica is found in all except?
- A. Syphilis
- B. Carcinoma
- C. Sarcoid
- D. Leiomyosarcoma (Correct Answer)
Explanation: **Explanation:** **Linitis plastica** (also known as "leather bottle stomach") is a morphological description of a stomach that has become thickened, rigid, and non-distensible [1]. This occurs due to extensive **diffuse infiltration** of the gastric wall (submucosa and muscularis propria) by malignant cells or chronic inflammatory processes, leading to reactive **desmoplasia** (fibrosis). **Why Leiomyosarcoma is the correct answer:** Leiomyosarcoma is a mesenchymal tumor that typically grows as a **discrete, bulky, intramural mass** or an exophytic (outward-growing) lesion [2]. It does not cause the diffuse, circumferential infiltration or the intense desmoplastic reaction required to produce the "leather bottle" appearance. Therefore, it is not a cause of linitis plastica. **Analysis of other options:** * **Carcinoma:** This is the most common cause. Specifically, **diffuse-type gastric adenocarcinoma** (Lauren classification) featuring **signet ring cells** is the classic cause of linitis plastica [1]. * **Syphilis:** Tertiary syphilis can cause "gastric syphilis," characterized by diffuse gummatous infiltration and subsequent fibrosis of the gastric wall, mimicking the appearance of linitis plastica. * **Sarcoid:** Though rare, sarcoidosis can involve the stomach, leading to diffuse granulomatous infiltration and fibrosis, resulting in a rigid gastric wall. **NEET-PG High-Yield Pearls:** 1. **Classic Association:** Linitis plastica is most strongly associated with **Signet Ring Cell Carcinoma** (loss of E-cadherin/CDH1 mutation) [1]. 2. **Radiology:** On a barium meal, it presents as a narrow, rigid, tubular stomach with a loss of normal mucosal folds. 3. **Other Causes:** Apart from the options listed, **Lycoma** (Gastric Lymphoma) and **Scirrhous Carcinoma** of the breast (metastatic) can also cause a similar appearance. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 779-780. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 354-355.
Question 358: Which of the following is NOT a component of Carney's triad?
- A. Gastrointestinal stromal tumors (GIST)
- B. Pulmonary chondromas
- C. Osteomas (Correct Answer)
- D. Extra-adrenal paraganglioma
Explanation: **Explanation:** **Carney’s Triad** is a rare, non-hereditary syndrome primarily affecting young females. It is characterized by the synchronous or metachronous occurrence of three specific tumors. 1. **Why Option C is correct:** **Osteomas** are not a component of Carney’s triad. Osteomas (particularly of the mandible and skull) are classic features of **Gardner Syndrome**, which is a variant of Familial Adenomatous Polyposis (FAP) associated with intestinal polyps and soft tissue tumors. 2. **Why the other options are incorrect:** * **Option A (GIST):** These are typically multifocal and epithelioid in Carney’s triad. Unlike sporadic GISTs, these are usually **SDH-deficient** (succinate dehydrogenase) and do not harbor KIT or PDGFRA mutations. * **Option B (Pulmonary chondromas):** These are benign cartilaginous tumors of the lung. They are often asymptomatic and discovered incidentally on imaging. * **Option D (Extra-adrenal paraganglioma):** These are catecholamine-secreting tumors arising from the sympathetic chain [1]. **High-Yield Clinical Pearls for NEET-PG:** * **The "Triad" vs. Reality:** Although called a triad, only about 25% of patients present with all three tumors simultaneously. The presence of any **two** is sufficient for diagnosis. * **Carney-Stratakis Syndrome:** Do not confuse Carney’s Triad with Carney-Stratakis Syndrome. The latter is a **hereditary** dyad (GIST and Paraganglioma) caused by germline mutations in SDH subunits (A, B, C, or D) [1]. * **Carney Complex:** This is a distinct autosomal dominant condition (PRKAR1A mutation) characterized by "NAME" or "LAMB" syndrome (Myxomas, spotty skin pigmentation, and endocrine overactivity). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 748-749.
Question 359: Helicobacter pylori has been implicated in all, except:
- A. Gastric ulcer
- B. Gastric carcinoma
- C. Gastric lymphoma
- D. Gastric leiomyoma (Correct Answer)
Explanation: **Explanation:** *Helicobacter pylori* is a gram-negative, microaerophilic, flagellated bacterium that colonizes the gastric mucosa [2, 3]. It is a well-established pathogen in various gastroduodenal diseases due to its ability to induce chronic inflammation and genetic mutations. **Why Gastric Leiomyoma is the correct answer:** A **Gastric Leiomyoma** is a benign mesenchymal tumor arising from the smooth muscle of the stomach wall (tunica muscularis). Its etiology is related to neoplastic transformation of smooth muscle cells and is **not** associated with bacterial infection or chronic inflammation caused by *H. pylori*. **Why the other options are incorrect:** * **Gastric Ulcer:** *H. pylori* is the most common cause of peptic ulcer disease [4, 5]. It disrupts the protective mucosal barrier through urease production and inflammatory cytokines, leading to mucosal erosion. * **Gastric Carcinoma:** *H. pylori* is classified as a Group 1 Carcinogen. Chronic infection leads to a progression from chronic gastritis to intestinal metaplasia, dysplasia, and finally adenocarcinoma (the Correa pathway). * **Gastric Lymphoma:** Specifically, **MALToma** (Mucosa-Associated Lymphoid Tissue lymphoma) is strongly linked to *H. pylori* [1]. The chronic antigenic stimulation by the bacteria leads to B-cell proliferation. Notably, early-stage MALTomas can often be cured by *H. pylori* eradication alone. **High-Yield NEET-PG Pearls:** * **Virulence Factors:** **CagA** (most important for malignancy) and **VacA** (cytotoxin). * **Diagnostic Gold Standard:** Endoscopic biopsy followed by Histopathology (Warthin-Starry or Giemsa stain) [2, 3]. * **Most Sensitive Non-invasive Test:** Urea Breath Test (UBT). * **Site of Colonization:** Primarily the **Antrum** of the stomach [2, 3]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 356-357. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 770-771. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 774-775.
Question 360: Which polyp has the maximum malignant potential?
- A. Sessile (Correct Answer)
- B. Pedunculated
- C. Superficial spreading
- D. Any of the above
Explanation: The malignant potential of a colonic polyp is determined by its size, histological type (villous > tubular), and its **morphology**. **Why Sessile is the correct answer:** Sessile polyps are broad-based and lack a stalk. Because they are attached directly to the colonic wall, any malignant transformation has a much shorter distance to travel to invade the **submucosa** and the underlying lymphatics/vasculature. In contrast, a malignancy in a pedunculated polyp must first traverse the length of the stalk before reaching the bowel wall. Furthermore, sessile morphology is frequently associated with **villous histology** [2] and **Serrated lesions** [1], both of which carry a significantly higher risk of progression to adenocarcinoma compared to tubular adenomas. **Analysis of Incorrect Options:** * **B. Pedunculated:** These polyps have a tubular stalk (pedicle). They are generally easier to resect completely via colonoscopy, and the stalk acts as a "buffer zone" that delays the invasion of the muscularis mucosae into the bowel wall [2]. * **C. Superficial spreading:** While these lesions (often called Lateral Spreading Tumors) are significant, they are technically a subset of sessile lesions [2]. In the context of standard NEET-PG questions, "Sessile" is the broader, classic term used to denote higher risk compared to pedunculated. * **D. Any of the above:** Incorrect, as risk is clearly stratified by morphology. **NEET-PG High-Yield Pearls:** 1. **Size is the most important predictor:** Polyps >2 cm have a 40-50% risk of malignancy [2, 4]. 2. **Histology:** Villous adenomas ("Villainous") have the highest malignant potential among adenomatous polyps [2]. 3. **Non-neoplastic polyps:** Hyperplastic, Hamartomatous (Peutz-Jeghers), and Inflammatory polyps generally have no malignant potential. 4. **The "Adenoma-Carcinoma Sequence":** Involves mutations in *APC* (earliest), *KRAS*, and *TP53* [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 821-822. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 371-373. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 815-817.
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