Anatomy
1 questionsWhich of the following statements is true regarding an epidural hematoma?
NEET-PG 2015 - Anatomy NEET-PG Practice Questions and MCQs
Question 551: Which of the following statements is true regarding an epidural hematoma?
- A. Inside the brain
- B. Between skull and dura mater (Correct Answer)
- C. Between skull and outermost periosteal layer
- D. Between scalp and outer skull layer
Explanation: ***Between skull and dura mater*** - An **epidural (extradural) hematoma** occurs when bleeding accumulates in the **potential space between the skull and the dura mater** [1]. - More precisely, it forms between the **periosteal layer of dura** (adherent to skull) and the **meningeal layer of dura**, stripping the dura away from the skull. - This typically results from a tear in the **middle meningeal artery** following traumatic head injury, classically from a **temporal bone fracture**. - Classic presentation: **lucid interval** followed by deterioration with **biconvex (lentiform) appearance** on CT scan [1]. *Inside the brain* - Bleeding *inside the brain parenchyma* itself is an **intracerebral hemorrhage**, not an epidural hematoma. - Caused by hypertension, trauma, vascular malformations, or hemorrhagic stroke. - CT shows intraparenchymal blood collection, not extra-axial. *Between skull and outermost periosteal layer* - This is anatomically **not a potential space** since the periosteal layer of dura is **firmly adherent** to the inner table of the skull. - An epidural hematoma actually strips this periosteal layer *away* from the skull, creating the space. - This option is incorrectly phrased and anatomically impossible as stated. *Between scalp and outer skull layer* - Bleeding *between the scalp and outer skull surface* is a **subgaleal hematoma** (crosses suture lines) or **cephalhematoma** in neonates (limited by suture lines). - These are **extracranial** collections, superficial to the skull bones. - Completely different from an **intracranial** epidural hematoma.
Forensic Medicine
3 questionsBest temperature for putrefaction is -
Chicken fat clot is seen in -
What is the most specific sign of antemortem burns?
NEET-PG 2015 - Forensic Medicine NEET-PG Practice Questions and MCQs
Question 551: Best temperature for putrefaction is -
- A. 0-10 °C
- B. 45-100 °C
- C. 100-150 °C
- D. 10-45 °C (Correct Answer)
Explanation: ***10-45 °C*** - This temperature range is optimal for the **bacterial and enzymatic activity** required for putrefaction, as most decomposition bacteria thrive in mesophilic conditions. - Temperatures within this range accelerate the breakdown of complex organic matter into simpler compounds, leading to the characteristic changes of **decomposition**. *0-10 °C* - Temperatures below 10°C significantly **slow down bacterial metabolism** and enzymatic activity, thereby retarding the process of putrefaction. - At temperatures near 0°C, decomposition is almost entirely halted due to **cold preservation** effects. *45-100 °C* - Temperatures above 45°C can begin to **denature enzymes** and kill many of the bacteria responsible for putrefaction, especially as temperatures approach the upper end of this range. - While some thermophilic bacteria exist, the overall rate of decomposition for a cadaver typically **decreases at very high temperatures** due to sterilization effects or protein coagulation. *100-150 °C* - At these very high temperatures, most **bacteria would be destroyed**, and enzymatic activity would be completely inhibited due to extensive protein denaturation. - Such temperatures are more likely to cause **cremation or desiccation** rather than putrefaction.
Question 552: Chicken fat clot is seen in -
- A. Antemortem thrombus
- B. Currant jelly clot
- C. Postmortem clot (Correct Answer)
- D. Antemortem wound
Explanation: ***Postmortem clot*** - **"Chicken fat" clot** is a classical postmortem finding observed during autopsy in the **heart chambers and large blood vessels**. - It appears as a **yellowish, gelatinous layer** (plasma with lipids) overlying a **darker red layer** (settled red blood cells) due to gravitational separation of blood components after cessation of circulation. - This appearance indicates **postmortem blood coagulation** and helps distinguish postmortem clots from antemortem thrombi. - **Key differentiating features**: Postmortem clots are smooth, shiny, unattached to vessel walls, and rubbery in consistency. *Antemortem thrombus* - **Antemortem thrombi** form during life and show attachment to the vessel wall (**lines of Zahn**), dull surface, and friable consistency. - They are **firmly adherent** to the endothelium and show evidence of organization with inflammatory response. - The texture is **uniform** without the characteristic yellow-red separation seen in chicken fat clots. *Currant jelly clot* - **Currant jelly clot** is another type of postmortem clot that appears **dark red and gelatinous** throughout. - It forms when red blood cells remain relatively mixed with plasma, unlike the separated appearance of chicken fat clots. - Both are postmortem findings, but have different gross appearances. *Antemortem wound* - **Antemortem wounds** show vital reactions including hemorrhage, inflammation, and tissue response. - Blood at antemortem injury sites shows **active coagulation** during life, not the passive gravitational separation characteristic of chicken fat clots. - The chicken fat appearance is specific to **intravascular postmortem clots**, not wound sites.
Question 553: What is the most specific sign of antemortem burns?
- A. Cyanosis of the fingernails
- B. Pugilistic attitude
- C. Heat ruptures
- D. Presence of soot in the respiratory passage (Correct Answer)
Explanation: ***Presence of soot in the respiratory passage*** - The presence of **soot** in the **trachea, bronchi, and lungs** is a definitive sign of **inhalation during a fire**, indicating the person was alive and breathing when exposed to the fire. - This finding demonstrates **vital reaction** to the fire and is crucial forensic evidence of **antemortem burns** or smoke inhalation. *Cyanosis of the fingernails* - **Cyanosis** indicates **hypoxia** or **poor oxygenation**, which can occur antemortem during a fire but is not specific to burns. - It can also be seen in other conditions leading to death, and its presence does not solely indicate vital reaction to fire. *Pugilistic attitude* - This refers to the **flexion of the limbs** and clenching of fists due to **heat-induced muscle contraction** and protein denaturation. - While common in fire deaths, it is a **postmortem phenomenon** resulting from heat acting on the body, not a sign of life during the fire. *Heat ruptures* - **Heat ruptures** (or heat fractures) are **skin tears** or bone fractures caused by intense heat, often mimicking traumatic injuries. - These are **postmortem artifacts** resulting from tissue expansion and cracking due to heat, and do not indicate vital reaction.
Pathology
4 questionsCaseating necrosis most commonly occurs in
Liquefactive necrosis is seen in:
Which type of necrosis is most commonly associated with the spread of infection?
What type of necrosis is associated with Myocardial Infarction (MI)?
NEET-PG 2015 - Pathology NEET-PG Practice Questions and MCQs
Question 551: Caseating necrosis most commonly occurs in
- A. Brain
- B. Liver
- C. Kidney
- D. Lung (Correct Answer)
Explanation: ***lung*** - **Caseating necrosis** is classically associated with **tuberculosis**, which primarily affects the lungs [1]. - It is characterized by the presence of **granulomatous inflammation**, often leading to the formation of cavities in pulmonary tissue. *Brain* - While certain infections can lead to necrosis in the brain, they typically do not present as **caseating necrosis**, which is specific to certain conditions like tuberculosis. - The brain may show **liquefactive necrosis** or other types of necrosis, rather than **caseation**. *liver* - The liver usually shows **macrovesicular steatosis** or **apoptosis** in conditions like hepatitis, not caseating necrosis. - **Granulomatous hepatitis** can occur, but it does not typically result in **caseating** type necrosis associated with lung pathology. *kidney* - The kidneys can experience necrosis from various causes, but caseating necrosis is not typical; they are more often involved in **focal segmental glomerulosclerosis** or **acute tubular necrosis**. - Chronic kidney conditions may involve granulomas, but they usually are not characterized by **caseation** similar to that seen in pulmonary tissue. **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, p. 55.
Question 552: Liquefactive necrosis is seen in:
- A. Brain (Correct Answer)
- B. Cardiac tissue
- C. Pulmonary tissue
- D. Splenic tissue
Explanation: ***Brain*** - **Liquefactive necrosis** primarily occurs in the **brain** due to the high fat content and the process of enzymatic degradation of tissue after a cerebral infarction [1]. - This type of necrosis results in the transformation of tissue into a liquid viscous mass, often observed during **abscess formation** or ischemic damage [1]. *Spleen* - Commonly undergoes **caseous necrosis** in conditions like tuberculosis, not liquefactive necrosis. - **Hematopoietic tissue** destruction can occur, but it generally results in a differing necrotic pattern. *Heart* - Typically exhibits **coagulative necrosis** following myocardial infarction due to ischemic damage. - This results in the preservation of tissue architecture, differing from the liquid consistency seen in liquefactive necrosis. *Lungs* - Usually experiences **caseous necrosis** in the context of pulmonary tuberculosis, or **hemorrhagic necrosis** after certain infections, but not liquefactive necrosis. - The predominant necrotic process in the lungs is often related to **inflammatory responses** rather than liquefactive changes. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1268-1269.
Question 553: Which type of necrosis is most commonly associated with the spread of infection?
- A. Fibrinoid necrosis
- B. Fat necrosis
- C. Liquefactive necrosis (Correct Answer)
- D. Coagulative necrosis
Explanation: ***Liquifactive necrosis*** - Caused by the enzymatic digestion of tissue, leading to the formation of liquid pus, typically associated with bacterial infections [1]. - Commonly occurs in the **brain** and in a tissue impacted by **pyogenic bacteria** [1], demonstrating how infection can lead to tissue damage. *Fat necrosis* - Primarily related to inflammation of fat tissue, often seen in pancreatitis or trauma to fat areas. - It is not directly caused by infections but rather by fat cell damage and necrosis, leading to **saponification**. *Fibrinoid necrosis* - Associated with **immune-mediated vascular injury**, seen in conditions like **vasculitis** or **malignant hypertension** [2]. - Characterized by the deposition of **fibrin-like protein** [2], not directly related to infectious processes. *Coagulative necrosis* - Typically occurs in ischemic conditions like myocardial infarction, where tissue architecture is preserved despite cell death. - It is not directly linked to infection spread, as it relates more to loss of blood supply rather than infectious agents. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 193-194. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 103-104.
Question 554: What type of necrosis is associated with Myocardial Infarction (MI)?
- A. Coagulative necrosis (Correct Answer)
- B. Liquefactive necrosis
- C. Caseous necrosis
- D. Fat necrosis
Explanation: ***Coagulative necrosis*** - Myocardial infarction (MI) typically results in **coagulative necrosis**, characterized by the preservation of the outline of the tissue despite cellular death [1]. - It is often associated with **ischemia**, where blood supply is obstructed, leading to cell death while maintaining tissue architecture for a time [1]. *Fat necrosis* - Fat necrosis is typically associated with **trauma** or **inflammation** in fat tissue, often seen in conditions like pancreatitis. - It is characterized by the presence of **necrotic adipocytes** and does not involve the myocardium directly or predominantly. *Caseous necrosis* - Caseous necrosis is often associated with **tuberculosis** infections, where tissue becomes crumbly and cheese-like. - It is not relevant to myocardial infarction, which does not present with the classical **granulomatous inflammation** of caseous necrosis. *Liquefactive necrosis* - Liquefactive necrosis typically occurs in conditions such as **brain infarcts** or bacterial infections leading to **pus formation**, not in MI. - It involves the transformation of tissue into a **liquid viscous mass**, which is not characteristic of myocardial tissue affected by infarction. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552.
Pharmacology
1 questionsWhich of the following is not a known side effect of amiodarone?
NEET-PG 2015 - Pharmacology NEET-PG Practice Questions and MCQs
Question 551: Which of the following is not a known side effect of amiodarone?
- A. Peripheral neuropathy
- B. Hyperthyroidism
- C. Hyperglycemia (Correct Answer)
- D. Skin discoloration
Explanation: ***Hyperglycemia*** - **Hyperglycemia** is generally **not recognized** as a direct or common side effect of amiodarone. - Amiodarone's primary action is on cardiac ion channels, and its metabolic effects typically involve thyroid function, not glucose regulation. *Hyperthyroidism* - Amiodarone contains **iodine**, which can induce **thyroid dysfunction**, including both hypo- and hyperthyroidism. - **Amiodarone-induced hyperthyroidism (AIH)** can occur due to increased thyroid hormone synthesis or destructive thyroiditis. *Peripheral neuropathy* - **Neurological side effects**, including **peripheral neuropathy**, are known to occur with chronic amiodarone use. - Symptoms often include **paresthesias**, weakness, and sensory loss in the extremities. *Skin discoloration* - Prolonged use of amiodarone can lead to **bluish-gray skin discoloration**, particularly in sun-exposed areas. - This is due to the **accumulation of amiodarone** and its metabolites in the skin.
Psychiatry
1 questionsWhich hormone is primarily responsible for maintaining the luteal phase of the menstrual cycle?
NEET-PG 2015 - Psychiatry NEET-PG Practice Questions and MCQs
Question 551: Which hormone is primarily responsible for maintaining the luteal phase of the menstrual cycle?
- A. Estrogen
- B. Progesterone (Correct Answer)
- C. Follicle-stimulating hormone (FSH)
- D. Luteinizing hormone (LH)
Explanation: ***Progesterone*** - **Progesterone**, secreted by the **corpus luteum** after ovulation, is crucial for maintaining the luteal phase by preparing the **endometrium** for implantation. - It causes the endometrial lining to thicken and become more vascularized, creating a suitable environment for a fertilized egg. *Estrogen* - While **estrogen** is important throughout the menstrual cycle for endometrial proliferation, its primary role is in the **follicular phase**, not the maintenance of the luteal phase. - Estrogen levels are higher during the follicular phase, promoting the growth of the dominant follicle. *Follicle-stimulating hormone (FSH)* - **FSH** is primarily responsible for stimulating the growth and development of **ovarian follicles** during the follicular phase. - Its levels decrease significantly after ovulation, and it does not play a direct role in maintaining the luteal phase. *Luteinizing hormone (LH)* - **LH** triggers **ovulation** and the formation of the **corpus luteum** from the ruptured follicle. - While essential for initiating the luteal phase, its levels decline afterward, and it's not the primary hormone for *maintaining* the corpus luteum's function.