General Pathology Practice Questions

Q: Obstructive shock is due to which of the following mechanisms?

Mechanical impediment to blood flow. Shock is defined as a state of cellular and tissue hypoxia due to reduced oxygen delivery or increased oxygen consumption [3]. **Obstructive shock** occurs when there is a **mechanical impediment to blood flow** into or out of the heart, despite normal myocardial function and adequate intravascular volume [1]. This obstruction leads to a drastic fall in cardiac output. **Why the other options are incorrect:** * **Cardiac pump failure (Option B):** This describes **Cardiogenic shock**, where the primary defect is the heart's inability to contract effectively (e.g., Myocardial Infarction) [3]. * **Peripheral pooling of blood (Option C):** This is the hallmark of **Distributive shock** (e.g., Sepsis, Anaphylaxis), characterized by massive vasodilation and decreased systemic vascular resistance [1]. * **Hypovolemia (Option D):** This defines **Hypovolemic shock**, caused by a loss of intravascular volume (e.g., Hemorrhage or dehydration). **High-Yield Clinical Pearls for NEET-PG:** 1. **Common Causes:** The "Big Three" causes of obstructive shock are **Tension Pneumothorax**, **Cardiac Tamponade**, and **Massive Pulmonary Embolism** [1], [2]. 2. **Hemodynamics:** Characterized by **decreased Cardiac Output (CO)** and **increased Systemic Vascular Resistance (SVR)** as a compensatory mechanism. 3. **Jugular Venous Pressure (JVP):** Unlike hypovolemic shock, JVP is typically **elevated** in obstructive shock (except in rare cases of SVC syndrome). 4. **Pulsus Paradoxus:** A classic finding in Cardiac Tamponade (an inspiratory drop in SBP >10 mmHg) [2]. 5. **Beck’s Triad:** (Hypotension, Muffled heart sounds, Distended neck veins) is specific for Cardiac Tamponade.

Q: Red infarction is typically seen in which organ?

Small intestine. **Explanation:** Infarction is classified into two types based on the amount of hemorrhage: **Red (Hemorrhagic)** and **White (Anemic)** [2]. **Why Small Intestine is Correct:** Red infarcts occur in tissues with a **dual blood supply**, loose textures, or where blood can collect in the infarcted zone [2]. The small intestine is a classic example because it has extensive collateral circulation (mesenteric arcades) [1]. When an arterial occlusion occurs, blood from collateral vessels seeps into the necrotic area. Additionally, red infarcts are characteristic of **venous occlusions** (e.g., mesenteric venous thrombosis) and **reperfusion injury**, both of which are common in the bowel [2]. **Analysis of Incorrect Options:** * **Kidney (A) & Heart (D):** These are solid organs with **end-arterial circulation**. When an artery is blocked, there is no secondary supply to bleed into the necrotic zone, resulting in a **White (Anemic) Infarct** [2]. * **Brain (B):** While the brain can undergo "hemorrhagic transformation," it typically undergoes **Liquefactive Necrosis**. In the context of primary arterial occlusion, it is generally considered a pale infarct unless reperfused. **High-Yield NEET-PG Pearls:** * **Mnemonic for Red Infarcts (S-L-O-B):** **S**pongiose tissue (Lung), **L**oose tissue (Testis/Ovary), **O**cclusion (Venous), **B**lood (Dual supply/Small Intestine/Liver). * **White Infarcts** occur in solid organs with a single blood supply: **Heart, Spleen, and Kidney** [2]. * **Morphology:** Red infarcts remain red/firm, while white infarcts are wedge-shaped with the apex pointing toward the occlusion [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 785-786. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, p. 140.

Q: Psammoma bodies are typically seen in which of the following conditions?

Follicular carcinoma of the thyroid. **Explanation** Psammoma bodies are round, microscopic calcifications with a concentric "laminated" or "onion-skin" appearance. They represent a process of dystrophic calcification occurring in necrotic tumor cells. **Why the Correct Answer is Right:** Wait—there is a critical correction needed based on standard pathology: **Psammoma bodies are NOT typically seen in Follicular Carcinoma of the Thyroid.** In fact, the absence of Psammoma bodies is a distinguishing feature of Follicular Carcinoma. They are most classically associated with **Papillary Carcinoma of the Thyroid**. *Note: If the question provided identifies Option A as correct, it is likely a "negative" question or a common distractor error in mock banks. In standard medical literature, Psammoma bodies are the hallmark of Papillary, not Follicular, carcinoma.* **Analysis of Options:** * **Papillary Carcinoma of the Thyroid (Option B):** The most common site for Psammoma bodies in the endocrine system. They are found in the cores of the papillae. * **Serous Cystadenocarcinoma of the Ovary (Option C):** Psammoma bodies are a classic finding in serous tumors of the ovary and are used to differentiate them from mucinous tumors. * **Meningioma (Option D):** These are frequently seen in the psammomatous variant of meningiomas. **High-Yield Clinical Pearls (Mnemonic: PSaMMoma):** To remember the conditions associated with Psammoma bodies, use the mnemonic **PSaMMoma**: 1. **P** - **P**apillary carcinoma of thyroid 2. **S** - **S**erous cystadenocarcinoma of ovary 3. **M** - **M**esothelioma 4. **M** - **M**eningioma **NEET-PG Key Fact:** If you see "Orphan Annie eye nuclei" and "Psammoma bodies" in a thyroid case, the diagnosis is always **Papillary Carcinoma**. Follicular carcinoma is characterized by capsular or vascular invasion, not Psammoma bodies.

Q: The Feulgen reaction is used to test for which of the following?

DNA. **Explanation:** The **Feulgen reaction** is a specialized histochemical staining technique used specifically for the identification and quantification of **DNA** (Deoxyribonucleic acid) within cells. **Why DNA is the correct answer:** The reaction relies on the **acid hydrolysis** of DNA using hydrochloric acid (HCl). This process removes purine bases (adenine and guanine) from the deoxyribose sugar, creating free aldehyde groups (forming apurinic acid). These aldehydes then react with **Schiff’s reagent**, resulting in a characteristic **magenta or reddish-purple** color. Because the reaction is stoichiometric (the intensity of the color is proportional to the amount of DNA), it is frequently used in flow cytometry and image analysis to measure ploidy. **Why other options are incorrect:** * **mRNA, tRNA, and rRNA (Options A, B, D):** These are forms of RNA. The Feulgen reaction is **negative for RNA** because the presence of a hydroxyl group (-OH) at the 2' position of the ribose sugar prevents the acid hydrolysis required to expose aldehyde groups. Therefore, the nucleolus (rich in rRNA) and the cytoplasm (rich in mRNA/tRNA) do not stain with Feulgen. **High-Yield Clinical Pearls for NEET-PG:** * **Specific Stain:** Feulgen is considered the most specific histochemical stain for DNA. * **Counterstain:** Fast Green is commonly used as a counterstain to provide contrast against the magenta DNA. * **RNA Stain:** To differentiate between DNA and RNA, the **Methyl Green-Pyronin (MGP) stain** is used (DNA stains green/blue-green, while RNA stains red/pink). * **Hydrolysis Step:** The critical step in the Feulgen reaction is the controlled acid hydrolysis; over-hydrolysis can lead to a false-negative result by destroying the DNA structure.

Q: Under which of the following conditions does the uterus show both hypertrophy and hyperplasia simultaneously?

Pregnancy. **Explanation:** The correct answer is **Pregnancy**. During pregnancy, the uterus undergoes a massive increase in size and weight (from ~70g to ~1100g) to accommodate the growing fetus. This enlargement is driven by two distinct cellular processes: 1. **Hypertrophy:** An increase in the size of individual myometrial cells (fibers). This is the dominant process, especially after the first trimester, driven by mechanical stretch. 2. **Hyperplasia:** An increase in the total number of myometrial cells. This occurs primarily in the early stages of pregnancy under the influence of estrogen. **Why other options are incorrect:** * **Multiparity:** This refers to a woman who has given birth multiple times. While the uterus may remain slightly larger than a nulliparous uterus (permanent structural changes), active hypertrophy and hyperplasia are features of the *gestational state*, not the state of having previously given birth. * **Nulliparity:** This refers to a woman who has never given birth. The uterus remains in its baseline, non-pregnant state. * **Puberty:** While the uterus grows during puberty due to hormonal stimulation (estrogen), the simultaneous, massive, and rapid combination of both hypertrophy and hyperplasia is the hallmark physiological response unique to **pregnancy**. **High-Yield Clinical Pearls for NEET-PG:** * **Hormonal Influence:** Early uterine growth is due to **Estrogen** (hormone-dependent); later growth is due to **Mechanical Stretch** (pressure-dependent). * **Muscle Arrangement:** The myometrium develops an "interlacing figure-of-eight" pattern, which acts as "living ligatures" to prevent postpartum hemorrhage. * **Uterine Blood Flow:** Increases from 50 mL/min in the non-pregnant state to approximately **500–750 mL/min** at term.

Question 1

Obstructive shock is due to which of the following mechanisms?

Accepted Answer

Mechanical impediment to blood flow

Answer

Cardiac pump failure

Answer

Peripheral pooling of blood

Answer

Hypovolemia

Question 2

What is the most reliable investigation for amyloid disease?

Accepted Answer

Rectal biopsy

Answer

Immunoglobulin assay

Answer

Ultrasound

Answer

Urine examination

Question 3

Fat necrosis is classically seen in which organ?

Accepted Answer

Breast

Answer

Heart

Answer

Brain

Answer

Lungs

Question 4

Red infarction is typically seen in which organ?

Accepted Answer

Small intestine

Answer

Kidney

Answer

Brain

Answer

Heart

Question 5

A 4-year-old boy presents with extremely pliable skin, easy bruising, and joint hyperextensibility. Biochemical studies show a deficiency of lysyl hydroxylase. What cellular or tissue component abnormalities would most likely be revealed by ultrastructural examination of a skin biopsy from this patient?

Accepted Answer

Collagen fibers

Answer

Actin-myosin filaments

Answer

Glycocalyx

Answer

Intermediate filaments

Question 6

Liquefactive necrosis on necrotic tissue results in which of the following?

Accepted Answer

Infarct

Answer

Gangrene

Answer

Embolism

Answer

Caseation

Question 7

Aspiration of fluid around the knee joint in a diabetic patient undergoing dialysis would show which of the following?

Accepted Answer

beta-2 microglobulin

Answer

AA amyloid

Answer

AL amyloid

Answer

Lactoferrin

Question 8

Psammoma bodies are typically seen in which of the following conditions?

Accepted Answer

Follicular carcinoma of the thyroid

Answer

Papillary carcinoma of the thyroid

Answer

Serous cystadenocarcinoma of the ovary

Answer

Meningioma

Question 9

The Feulgen reaction is used to test for which of the following?

Accepted Answer

DNA

Answer

mRNA

Answer

tRNA

Answer

rRNA

Question 10

Under which of the following conditions does the uterus show both hypertrophy and hyperplasia simultaneously?

Accepted Answer

Pregnancy

Answer

Multiparity

Answer

Nulliparity

Answer

Puberty

General Pathology — MCQs

General Pathology — MCQs

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