NEET-PG 2018 — Forensic Medicine

Q: Muscle pain and nephropathy with proximal tubule proteinuria are caused by which metal poisoning?

Cadmium. ***Cadmium*** - **Cadmium poisoning** particularly affects the kidneys, causing **tubular proteinuria** due to damage to the proximal tubules, and can also lead to **muscle pain**. - Chronic exposure is associated with **Itai-itai disease** (meaning "it hurts-it hurts" in Japanese), characterized by **osteomalacia**, skeletal pain, and an increased risk of fractures due to its impact on calcium and phosphate metabolism. - The proximal tubular damage results in excretion of **low molecular weight proteins** (β2-microglobulin). *Mercury* - **Mercury poisoning** primarily affects the nervous system (e.g., **tremors, paresthesias, memory loss**) and the kidneys, but is less commonly associated with significant muscle pain or proximal tubular proteinuria as a primary feature. - Exposure routes include ingestion of contaminated fish (**methylmercury**) or inhalation of mercury vapor. *Lead* - **Lead poisoning** is characterized by **abdominal pain (colic)**, **neuropathy (wrist drop)**, **anemia**, and **nephropathy**, but the kidney damage is typically **interstitial** rather than primarily proximal tubular proteinuria. - It also affects the **central nervous system**, especially in children, leading to developmental delays. *Arsenic* - **Arsenic poisoning** is known for its effects on the skin (**hyperkeratosis, hyperpigmentation, Mees' lines**), nervous system (**peripheral neuropathy**), and gastrointestinal tract (severe vomiting and diarrhea). - While it can cause kidney damage, **proximal tubular proteinuria** is not its hallmark renal manifestation, and muscle pain is not a primary symptom. [Practice more Forensic Medicine PYQs on OnCourse]

Q: What is the characteristic smell of a properly mummified body?

Odourless. ***Odourless*** - A **properly mummified body** is characterized by **complete desiccation (drying) of tissues**, which prevents decomposition and eliminates putrefactive odors. - In **forensic contexts**, mummification typically occurs through **natural processes** in dry, well-ventilated environments, or through **artificial embalming** that removes moisture and inhibits bacterial growth. - The **absence of moisture** makes the body largely **odorless**, as decomposition bacteria cannot survive without water. *Sweet* - A **sweet smell** is associated with **early decomposition stages**, particularly due to the formation of **adipocere** (grave wax) or **ketone production** during fat breakdown. - This smell indicates **active decomposition**, which is **absent in properly mummified remains**. *Offensive* - An **offensive smell** indicates active **putrefaction** with significant microbial activity producing foul-smelling gases (hydrogen sulfide, cadaverine, putrescine). - Mummification **prevents putrefaction** by removing the moisture necessary for bacterial growth. - An offensive odor in supposed mummified remains suggests **incomplete mummification** or **environmental degradation**. *Pungent* - A **pungent smell** arises from **ammonia and volatile amines** produced during protein decomposition by bacteria. - This indicates **active autolysis and putrefaction**, processes that are **arrested in true mummification** due to tissue desiccation. - A properly preserved mummy should **not produce decomposition-related odors**. [Practice more Forensic Medicine PYQs on OnCourse]

2 Previous Year Questions with Answers & Explanations

Questions

Muscle pain and nephropathy with proximal tubule proteinuria are caused by which metal poisoning?

What is the characteristic smell of a properly mummified body?