General Pathology Practice Questions

Q: A lesion 3 cm away from the gastroesophageal junction contains columnar epithelium. What is such a lesion called?

Metaplasia. ### Explanation **Correct Answer: A. Metaplasia** **Why Metaplasia is correct:** Metaplasia is defined as a reversible change in which one adult cell type (epithelial or mesenchymal) is replaced by another adult cell type. In this clinical scenario, the normal lining of the lower esophagus is **stratified squamous epithelium**. When exposed to chronic acid reflux (GERD), the esophagus adapts by replacing the squamous cells with **columnar epithelium** (with goblet cells), which is more resistant to acid. This specific transformation at the gastroesophageal junction is known as **Barrett’s Esophagus**. **Why the other options are incorrect:** * **B. Hyperplasia:** This refers to an increase in the *number* of cells in an organ or tissue, usually resulting in increased volume. The cell type remains the same. * **C. Dysplasia:** This refers to disordered growth and maturation of an epithelium. It is characterized by a loss of architectural uniformity and individual cell pleomorphism. While Barrett’s can progress to dysplasia, the initial change from squamous to columnar is metaplasia. * **D. Anaplasia:** This is a hallmark of malignancy. It refers to a total lack of differentiation, where cells lose their structural and functional resemblance to normal adult cells. **High-Yield Clinical Pearls for NEET-PG:** * **Barrett’s Esophagus:** It is the most common example of **Squamous-to-Columnar Metaplasia**. * **Risk of Malignancy:** Barrett’s esophagus is a significant risk factor for **Esophageal Adenocarcinoma** (not squamous cell carcinoma). * **Vitamin A Deficiency:** Can lead to **Squamous Metaplasia** in the respiratory tract (columnar to squamous). * **Connective Tissue Metaplasia:** Formation of bone in soft tissue following trauma is called **Myositis Ossificans**.

Q: What is the cause of nephrocalcinosis in granulomatous diseases?

Increased conversion to 1,25-dihydroxyvitamin D. **Explanation:** In granulomatous diseases such as **Sarcoidosis** and **Tuberculosis**, hypercalcemia and subsequent nephrocalcinosis occur due to the dysregulated metabolism of Vitamin D. 1. **Mechanism (Why B is correct):** Normally, the conversion of 25-hydroxyvitamin D to its active form, **1,25-dihydroxyvitamin D (Calcitriol)**, is strictly regulated by the enzyme **1-alpha-hydroxylase** in the kidneys, under the control of PTH [2]. However, in granulomatous diseases, the **activated macrophages** within the granulomas express 1-alpha-hydroxylase independently of PTH. This leads to the autonomous, excessive production of calcitriol, which increases intestinal calcium absorption and bone resorption, resulting in hypercalcemia, hypercalciuria, and nephrocalcinosis. 2. **Analysis of Incorrect Options:** * **Option A:** While increased calcium absorption occurs, it is the *consequence* of the primary pathology (elevated 1,25-dihydroxyvitamin D), not the root cause. * **Option C:** Dystrophic calcification occurs in necrotic or damaged tissues with normal serum calcium levels. In granulomatous disease, the calcification is **metastatic** (due to high serum calcium). * **Option D:** Mutations in the calcium-sensing receptor (CaSR) are associated with Familial Hypocalciuric Hypercalcemia (FHH), not granulomatous disease [1]. **High-Yield NEET-PG Pearls:** * **Classic Presentation:** A patient with bilateral hilar lymphadenopathy (Sarcoidosis) presenting with kidney stones or polyuria. * **Lab Findings:** High Calcium, High Phosphate, **Low PTH** (suppressed by high Ca), and **High 1,25-(OH)₂D**. * **Treatment:** Glucocorticoids are the mainstay as they inhibit the 1-alpha-hydroxylase enzyme in macrophages.

Q: Inflammasome is formed in which type of cell death?

Pyroptosis. **Explanation:** **Pyroptosis** is a specialized form of programmed cell death characterized by the activation of the **Inflammasome** [2]. The process begins when cytosolic receptors (like NLRP3) recognize PAMPs or DAMPs, leading to the formation of the inflammasome complex [1]. This complex activates **Caspase-1**, which performs two critical functions: it cleaves pro-IL-1̠ into its active inflammatory form and cleaves **Gasdermin D** [2]. The N-terminal fragments of Gasdermin D form pores in the plasma membrane, causing osmotic swelling, membrane rupture, and the release of inflammatory cytokines. **Analysis of Options:** * **Necrosis (A):** This is accidental, uncontrolled cell death resulting from severe injury. While it triggers inflammation due to membrane rupture, it does not involve the programmed assembly of an inflammasome. * **Apoptosis (B):** This is "silent" programmed cell death. It involves Caspases (3, 6, 7, 8, 9) but specifically avoids triggering an inflammasome or inflammation to prevent damage to surrounding tissues. * **Necroptosis (C):** A form of programmed necrosis that is **Caspase-independent** [2]. It relies on the RIPK1-RIPK3-MLKL pathway. While it mimics necrosis morphologically, it does not utilize the inflammasome machinery. **High-Yield Clinical Pearls for NEET-PG:** * **Key Enzyme:** Caspase-1 (Canonical) or Caspase-4/5/11 (Non-canonical) [2]. * **Key Protein:** Gasdermin D (the "pore-former"). * **Distinction:** Unlike apoptosis, pyroptosis is highly **pro-inflammatory**. * **Clinical Link:** Inflammasome overactivation is linked to gout (monosodium urate crystals) and Type 2 Diabetes [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 196. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, p. 71.

Question 1

Which of the following cytoplasmic structures contains fragmented mitochondria?

Accepted Answer

Autophagosomes

Answer

Pinocytotic vacuoles

Answer

Primary lysosomes

Answer

Heterophagosomes

Question 2

A 40-year-old pregnant female in her third trimester presents with bilateral leg swelling. Which type of thrombosis is most likely to develop in this patient?

Accepted Answer

Venous

Answer

Arterial

Answer

Mural

Answer

Saddle

Question 3

A lesion 3 cm away from the gastroesophageal junction contains columnar epithelium. What is such a lesion called?

Accepted Answer

Metaplasia

Answer

Hyperplasia

Answer

Dysplasia

Answer

Anaplasia

Question 4

What is the cause of nephrocalcinosis in granulomatous diseases?

Accepted Answer

Increased conversion to 1,25-dihydroxyvitamin D

Answer

Increased absorption of calcium

Answer

Dystrophic calcification

Answer

Mutation in calcium-sensing receptor

Question 5

A 24-year-old man is found to have an increased total body iron concentration. Biopsy of his liver shows large amounts of granular golden-brown pigment which stains blue with Prussian blue stain. The presence of which one of the following diseases best explains these findings?

Accepted Answer

Hemochromatosis

Answer

Systemic amyloidosis

Answer

Chronic congestive heart failure

Answer

Advanced atrophy

Question 6

What stains are used for amyloid detection?

Accepted Answer

Thioflavin

Answer

Congo red

Answer

Eosin

Answer

Auramine

Question 7

Which of the following is an example of metastatic calcification?

Accepted Answer

Milk alkali syndrome

Answer

Psammoma bodies

Answer

Rheumatic heart disease

Answer

Monckeberg's medial calcific sclerosis

Question 8

Inflammasome is formed in which type of cell death?

Accepted Answer

Pyroptosis

Answer

Necrosis

Answer

Apoptosis

Answer

Necroptosis

Question 9

In which of the following pathological processes are caspases involved?

Accepted Answer

Apoptosis

Answer

Fatty change

Answer

Hydropic degeneration

Answer

Collagen hyalinosis

Question 10

The ability of stem cells to differentiate into a cell of another lineage, expressing molecular characteristics and performing the function of the new cell type, is referred to as what?

Accepted Answer

Transdifferentiation

Answer

Dedifferentiation

Answer

Redifferentiation

Answer

Subdifferentiation

General Pathology — MCQs

General Pathology — MCQs

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