General Pathology Practice Questions

Q: Serum amyloid associated protein (SAA) is found in which of the following conditions?

Chronic inflammatory state. **Serum Amyloid Associated (SAA) protein** is an acute-phase reactant synthesized primarily by the liver under the influence of cytokines like IL-1, IL-6, and TNF-alpha. In **Chronic Inflammatory States** (such as Rheumatoid Arthritis [1], Bronchiectasis, or Osteomyelitis), prolonged elevation of SAA leads to its deposition in tissues as **AA Amyloid** (Secondary Amyloidosis). This is the hallmark of reactive systemic amyloidosis. **Analysis of Options:** * **Option A (Alzheimer’s Disease):** While Alzheimer's involves amyloid deposition, the specific protein involved is **Aβ (Amyloid Beta)**, derived from Amyloid Precursor Protein (APP), not SAA. * **Option C (Chronic Renal Failure):** Patients on long-term hemodialysis develop amyloidosis due to the accumulation of **β2-microglobulin** (Aβ2M), as it is not filtered by dialysis membranes. * **Option D (Malignant Hypertension):** This condition is associated with "Fibrinoid necrosis" of arterioles, not amyloid deposition. **NEET-PG High-Yield Pearls:** 1. **AL Amyloid:** Derived from Immunoglobulin Light Chains; associated with Multiple Myeloma (Primary Amyloidosis). 2. **ATTR:** Derived from Transthyretin; seen in Senile Systemic Amyloidosis and Familial Amyloid Polyneuropathies. 3. **Staining:** All amyloids show **Apple-green birefringence** under polarized light when stained with **Congo Red**. 4. **SAA vs. AA:** SAA is the soluble precursor in the blood; AA is the insoluble fibril deposited in tissues.

Q: Reversible loss of polarity with abnormality in size and shape of cells is known as?

Dysplasia. ### Explanation **Correct Answer: B. Dysplasia** **Dysplasia** is defined as disordered cellular development characterized by a **loss of architectural orientation (polarity)** and **cellular polymorphism** (variations in size and shape) [1]. Key features include increased nuclear-to-cytoplasmic (N:C) ratio, hyperchromatic nuclei, and increased mitotic figures. Crucially, dysplasia is considered a **pre-neoplastic** change that is **potentially reversible** if the inciting stimulus is removed, provided it has not progressed to carcinoma in situ [1]. **Analysis of Incorrect Options:** * **A. Metaplasia:** This is a reversible change where one **adult cell type** (epithelial or mesenchymal) is replaced by another adult cell type. While the cell type changes (e.g., columnar to squamous in smokers), the cells themselves maintain mature characteristics and polarity. * **C. Hyperplasia:** This refers to an increase in the **number of cells** in an organ or tissue, usually resulting in increased volume [1]. The cells remain morphologically normal and retain their polarity. * **D. Anaplasia:** This represents a total lack of differentiation and is a hallmark of **malignancy**. Unlike dysplasia, anaplasia is **irreversible** and involves a more profound loss of structural and functional differentiation. **NEET-PG High-Yield Pearls:** * **Reversibility:** Metaplasia, Hyperplasia, and Dysplasia are generally reversible; Anaplasia and Neoplasia are not. * **Carcinoma in situ:** When dysplastic changes involve the full thickness of the epithelium but do not penetrate the basement membrane, it is termed "Carcinoma in situ." * **Pleomorphism:** A key component of dysplasia and anaplasia, referring specifically to the variation in size and shape of cells and nuclei. * **Common Site:** The squamocolumnar junction of the cervix is a classic high-yield site for observing dysplastic changes (detected via Pap smear).

Q: Fibrinoid necrosis may be observed in which of the following conditions?

All the above. **Explanation:** **Fibrinoid necrosis** is a specialized form of cell death characterized by the deposition of immune complexes and plasma proteins (such as fibrin) into the walls of blood vessels [2]. On H&E staining, it appears as a bright pink, "smudgy," and circumferential eosinophilic area. **Why "All the Above" is correct:** The underlying mechanism involves damage to the vessel wall, allowing plasma proteins to leak into the media. This occurs in: 1. **Malignant Hypertension:** Extreme elevation in blood pressure causes acute hemodynamic injury to the arterioles, leading to fibrinoid necrosis (arteriolosclerosis) [2]. 2. **Polyarteritis Nodosa (PAN):** This is a systemic necrotizing vasculitis [1]. Immune complex deposition in the small-to-medium-sized arteries triggers an inflammatory response that destroys the vessel wall, resulting in a classic fibrinoid appearance [1]. 3. **Aschoff Bodies:** Found in the myocardium during **Acute Rheumatic Fever**, these pathognomonic foci of inflammation contain a central area of fibrinoid necrosis surrounded by Anitschkow cells (caterpillar cells). **High-Yield Clinical Pearls for NEET-PG:** * **Appearance:** It is the only type of necrosis that is typically **microscopic** and cannot be identified on gross examination. * **Immune-Mediated:** It is frequently associated with Type III Hypersensitivity reactions (e.g., SLE, Rheumatoid Arthritis). * **Key Site:** It is primarily seen in blood vessels, except for Aschoff bodies (heart) and Rheumatoid nodules (skin/subcutaneous tissue). * **Staining:** It stains intensely with **PAS stain** and **Martius Scarlet Blue (MSB)** due to the presence of fibrin. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 517-518. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 277-278.

Q: Which of the following statements is not true regarding necroptosis?

Caspase 8 is involved, but caspase 9 is not involved.. **Explanation:** Necroptosis is a form of programmed cell death that is morphologically similar to necrosis (cell swelling and membrane rupture) but mechanistically similar to apoptosis (genetically programmed) [1]. **Why Option C is the correct (False) statement:** The hallmark of necroptosis is that it is **caspase-independent**. While the process is often triggered by the ligation of the TNF receptor (TNFR1) [1], it specifically occurs when **Caspase-8 is inhibited or inactivated**. Under normal conditions, Caspase-8 cleaves pro-necroptotic kinases; when Caspase-8 is absent, the **RIPK1-RIPK3 complex** (necrosome) forms, leading to MLKL phosphorylation and membrane rupture [1]. Therefore, neither Caspase-8 nor Caspase-9 is involved in the execution of necroptosis. **Analysis of other options:** * **Option A:** Unlike apoptosis, necroptosis involves the leakage of cellular contents (DAMPs) due to membrane rupture, which triggers an **inflammatory response** [1]. * **Option B:** The final step of necroptosis involves the **MLKL protein** forming pores in the plasma membrane, leading to direct cell membrane damage and lysis. * **Option C:** It occurs in **pathological** states (e.g., ischemia-reperfusion injury, viral infections like CMV, pancreatitis) and **physiological** states (e.g., formation of the mammalian bone growth plate). **High-Yield NEET-PG Pearls:** * **Key Molecule:** MLKL (Mixed Lineage Kinase Domain-like protein) is the "executioner" of necroptosis. * **The Necrosome:** Composed of RIPK1 and RIPK3 kinases [1]. * **Inhibitor:** Necrostatin-1 is a specific inhibitor of RIPK1 used in research. * **Distinction:** It is often called "caspase-independent programmed necrosis" [1]. **References:** [1] 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, pp. 69-71.

Question 1

What is the most pathognomonic sign of irreversible cell injury?

Accepted Answer

Amorphous densities in mitochondria

Answer

Swelling of the cell membrane

Answer

Ribosomes detached from endoplasmic reticulum

Answer

Clumping of nuclear chromatin

Question 2

Which of the following is true of fat embolism?

Accepted Answer

Thrombocytopenia

Answer

Macroglobulinemia

Answer

Prothrombin time increased

Answer

Fat globules in urine

Question 3

Serum amyloid associated protein (SAA) is found in which of the following conditions?

Accepted Answer

Chronic inflammatory state

Answer

Alzheimer's disease

Answer

Chronic renal failure

Answer

Malignant hypertension

Question 4

A 60-year-old male patient complains of discoloration of the right leg. The patient has a history of diabetes mellitus and a traumatic injury to the right leg. Physical examination reveals blackish discoloration of the right leg with pus and a foul smell. Which of the following most appropriately describes the condition of this patient?

Accepted Answer

Wet gangrene

Answer

Dry gangrene

Answer

Psoriasis

Answer

Pemphigus

Question 5

Development of the female breast at puberty is an example of:

Accepted Answer

Hypertrophy and hyperplasia

Answer

Hypertrophy

Answer

Hyperplasia

Answer

Atrophy

Question 6

Reversible loss of polarity with abnormality in size and shape of cells is known as?

Accepted Answer

Dysplasia

Answer

Metaplasia

Answer

Hyperplasia

Answer

Anaplasia

Question 7

Apoptosis is regulated by which gene?

Accepted Answer

p53

Answer

BRAC

Answer

N-myc

Answer

RB

Question 8

Why do fetal cells continue to divide while terminally differentiated adult cells do not?

Accepted Answer

Adult cells have many cyclin inhibitors that prevent entry into the S phase.

Answer

Phosphatase is absent in fetal cells.

Answer

Proteinase is absent in the fetus.

Answer

CD kinases are absent in fetal cells.

Question 9

Fibrinoid necrosis may be observed in which of the following conditions?

Accepted Answer

All the above

Answer

Malignant Hypertension

Answer

Polyarteritis nodosa

Answer

Aschoff bodies

Question 10

Which of the following statements is not true regarding necroptosis?

Accepted Answer

Caspase 8 is involved, but caspase 9 is not involved.

Answer

Some amount of inflammation is present.

Answer

Cell membrane damage is observed.

Answer

It can be both physiological and pathological.

General Pathology — MCQs

General Pathology — MCQs

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