General Pathology Practice Questions

Q: Werner syndrome is characterized by which of the following?

Premature ageing. **Explanation:** **Werner Syndrome** is a rare autosomal recessive disorder characterized by **premature ageing** (progeria) [1]. It is caused by a mutation in the **WRN gene**, which encodes a member of the **RecQ helicase** family [1]. This enzyme is essential for DNA repair, replication, and maintaining telomere integrity. In its absence, cells accumulate genomic instability and enter replicative senescence prematurely, leading to the clinical manifestation of "adult progeria" [1]. **Analysis of Options:** * **A & B (MEN-I and MEN-II):** These are autosomal dominant syndromes involving endocrine tumors. While **Wermer Syndrome** (with an 'm') is another name for **MEN-I**, it is distinct from **Werner Syndrome** (with an 'n'). This is a common phonetic trap in exams. * **D (Defective sirtuins):** Sirtuins are NAD+-dependent deacetylases that promote longevity by inhibiting metabolic activity and increasing DNA repair. While decreased sirtuin activity is linked to the general aging process, it is not the primary molecular defect in Werner syndrome. **Clinical Pearls for NEET-PG:** * **Clinical Features:** Patients appear normal until puberty, followed by rapid aging: graying/loss of hair, bilateral cataracts, scleroderma-like skin changes, osteoporosis, and atherosclerosis. * **Malignancy Risk:** There is a significantly increased risk of rare cancers, particularly **soft tissue sarcomas** and osteosarcomas. * **Hutchinson-Gilford Progeria:** Unlike Werner (adult-onset), this is a childhood-onset progeria caused by mutations in the **LMNA gene** (Lamin A). * **Key Distinction:** Remember **Wermer** = MEN-1 (3 Ps: Pituitary, Parathyroid, Pancreas); **Werner** = WRN gene (Premature Ageing). **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. 77-78.

Q: What is the best method for confirming amyloidosis?

Rectal biopsy. **Explanation:** Amyloidosis is a systemic disorder characterized by the extracellular deposition of insoluble fibrillar proteins. To confirm the diagnosis, a tissue biopsy demonstrating **Congo Red staining** with characteristic **apple-green birefringence** under polarized light is the gold standard. **Why Rectal Biopsy is the Correct Answer:** Historically and for exam purposes, **rectal biopsy** is considered a highly reliable method for confirming systemic amyloidosis. It has a high diagnostic yield (approximately 75–85%) because the submucosal vessels of the rectum are frequently involved in the disease process. It is preferred over more invasive organ biopsies (like kidney or liver) due to a lower risk of procedural bleeding, which is a significant concern in amyloid patients due to factor X deficiency and vascular friability. **Analysis of Incorrect Options:** * **Colonoscopy & Sigmoidoscopy:** These are endoscopic procedures used to visualize the bowel. While they are used to perform a biopsy, the procedure itself is not the "method of confirmation"; the histological examination of the tissue is. * **Tongue Biopsy:** Although the tongue is a common site for macroglossia in AL amyloidosis, a biopsy here is painful and carries a higher morbidity compared to other sites. **High-Yield Clinical Pearls for NEET-PG:** * **Abdominal Fat Pad Aspiration:** In modern clinical practice, this is often the **initial** screening test of choice due to its non-invasive nature and high sensitivity (approx. 80%). * **Staining:** Congo Red is the classic stain. Thioflavin T (fluorescence) is more sensitive but less specific. * **Most Common Involved Organ:** The Kidney (often presenting as Nephrotic Syndrome). * **Most Common Cause of Death:** Cardiac involvement (Restrictive Cardiomyopathy/Arrhythmias).

Q: Which tissue is most susceptible to hypoxia?

Neurons. **Explanation:** The susceptibility of a tissue to hypoxia is directly proportional to its metabolic rate and its dependence on continuous aerobic respiration. **Why Neurons are the Correct Answer:** Neurons have the highest metabolic demand in the body and possess virtually no stores of glycogen or oxygen. They rely exclusively on a continuous supply of glucose and oxygen to maintain the Na+/K+ ATPase pump, which preserves membrane potential. Irreversible damage to cortical neurons occurs within just **3–5 minutes** of total oxygen deprivation. This makes the brain the most hypoxia-sensitive organ. **Analysis of Incorrect Options:** * **A & D. Muscle/Myocytes:** Skeletal muscle is highly resistant to hypoxia because it contains significant stores of glycogen and myoglobin (which stores oxygen). It can also switch to anaerobic glycolysis for extended periods. Cardiac myocytes are more sensitive than skeletal muscle but can still survive hypoxia for approximately 20–30 minutes before irreversible necrosis (infarction) occurs. * **C. Hepatocytes:** While metabolically active, hepatocytes have better regenerative capacity and can tolerate hypoxia longer than neurons (typically up to 1–2 hours) due to different enzymatic pathways and glycogen stores. **NEET-PG High-Yield Pearls:** 1. **Hierarchy of Sensitivity:** Neurons > Cardiac Myocytes > Hepatocytes > Skeletal Muscle > Connective Tissue/Skin. 2. **Selective Vulnerability:** Within the brain, the most sensitive areas to hypoxia are the **Pyramidal cells of the Hippocampus (Sommer’s sector)** and the **Purkinje cells of the Cerebellum**. 3. **Critical Threshold:** The brain consumes roughly 20% of the body's total oxygen despite being only 2% of body weight.

Question 1

Werner syndrome is characterized by which of the following?

Accepted Answer

Premature ageing

Answer

Multiple Endocrine Neoplasia type I (MEN-I)

Answer

Multiple Endocrine Neoplasia type II (MEN-II)

Answer

Defective sirtuins

Question 2

Which of the following is NOT a clinical manifestation of Disseminated Intravascular Coagulation?

Accepted Answer

Brain edema

Answer

Microthrombi

Answer

Sheehan postpartum pituitary necrosis

Answer

Waterhouse-Friderichsen syndrome

Question 3

Down's syndrome is associated with which of the following?

Accepted Answer

Congenital heart disease, Acute lymphoblastic leukemia, Early onset Alzheimer's disease

Answer

Acute lymphoblastic leukemia, Early onset Alzheimer's disease, CNS tumors, Infection

Answer

Early onset Alzheimer's disease, CNS tumors, Infection

Answer

Congenital heart disease, CNS tumors, Infection

Question 4

Which organ is most vulnerable to ischemic injury due to shock?

Accepted Answer

Heart

Answer

Lungs

Answer

Adrenals

Answer

Kidney

Question 5

Which of the following statements is NOT true for a white infarct?

Accepted Answer

Seen in loose tissues.

Answer

Wedge-shaped area with the apex pointing towards the arterial obstruction.

Answer

Can be transiently red.

Answer

Caused by arterial obstruction.

Question 6

A 28-year-old female patient presents with patches of burns and swelling of the arm. Histopathological findings reveal swelling of the endoplasmic reticulum, blebs from the cell membrane, loss of microvilli, presence of myeloid bodies, and no changes in the nucleus. Which type of cell injury is seen in this patient?

Accepted Answer

Reversible cell injury

Answer

Irreversible cell injury

Answer

Autolysis

Answer

Pyroptosis

Question 7

Which of the following conditions does NOT show the presence of fibrinoid necrosis?

Accepted Answer

Diabetic Glomerulosclerosis

Answer

Systemic Lupus Erythematosus (SLE)

Answer

Polyarteritis Nodosa (PAN)

Answer

Subacute Bacterial Endocarditis (SABE)

Question 8

Which of the following conditions is due to deposition of cholesterol?

Accepted Answer

Cholesterol

Answer

Glycogen

Answer

Water

Answer

Calcium

Question 9

What is the best method for confirming amyloidosis?

Accepted Answer

Rectal biopsy

Answer

Colonoscopy

Answer

Sigmoidoscopy

Answer

Tongue biopsy

Question 10

Which tissue is most susceptible to hypoxia?

Accepted Answer

Neurons

Answer

Muscle

Answer

Hepatocytes

Answer

Myocytes

General Pathology — MCQs

General Pathology — MCQs

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