Impotence and Sterility — MCQs
Which test is most sensitive for detecting semen in forensic investigations?
A couple comes for evaluation of infertility. The HSG was normal but semen analysis revealed azoospermia. What is the diagnostic test to differentiate between testicular failure and vas deferens obstruction?
Congenital adrenal hyperplasia is the most common cause of
Which of the following diuretics can lead to erectile dysfunction?
Organic cause for erectile dysfunction is most commonly:
For the following causes of sexual dysfunction, select the most likely clinical feature that can be caused by vascular disease.
Which of the following is a cause of male infertility?
In a case of alleged child sexual abuse, a 12-year-old girl shows healed complete hymenal transection at 7 o'clock position reaching the base, normal anal examination, and negative biological evidence. Medical history reveals road traffic accident 6 months ago with perineal injury. Synthesize the BEST medicolegal opinion.
A forensic expert examines a 28-year-old alleged rape victim 72 hours post-incident. Vulval swab negative for spermatozoa and PSA, but high vaginal swab shows presence of sperm heads without tails. Internal examination shows old hymenal scars. Evaluate the MOST valid medicolegal conclusion.
A 22-year-old woman alleges rape. Examination shows annular hymen with no tears but notch at 3 o'clock position extending to base. PSA positive vaginal swab, no spermatozoa seen. Which interpretation is MOST appropriate?
Impotence and Sterility Indian Medical PG Practice Questions and MCQs
Question 1: Which test is most sensitive for detecting semen in forensic investigations?
- A. Luminol test
- B. Acid phosphatase test (Correct Answer)
- C. Barberio test
- D. Florence test
Explanation: ***Acid phosphatase test*** - This test is highly sensitive for detecting **prostatic acid phosphatase (PAP)**, a key enzyme found in high concentrations in semen. - A positive result, indicated by a **rapid color change**, suggests the presence of seminal fluid, even in small quantities. *Luminol test* - The luminol test is used to detect **bloodstains** at a crime scene, causing them to luminescence, but it is not specific for semen. - While it can react to other substances and potentially give **false positives** for semen, its primary use is for blood detection. *Barberio test* - The Barberio test is a **confirmatory microcrystal test** for spermine, a component of semen. - It involves the formation of specific crystals; however, it is less sensitive for initial screening than the acid phosphatase test and requires the presence of spermine. *Florence test* - The Florence test is a **confirmatory microcrystal test** for choline, another component of semen. - Similar to the Barberio test, it is a corroborative test that requires the formation of specific crystals and is not used for initial, highly sensitive screening.
Question 2: A couple comes for evaluation of infertility. The HSG was normal but semen analysis revealed azoospermia. What is the diagnostic test to differentiate between testicular failure and vas deferens obstruction?
- A. Serum FSH (Correct Answer)
- B. Testicular FNAC
- C. Testosterone levels
- D. Karyotyping
Explanation: ***Serum FSH*** - In **testicular failure**, the pituitary gland tries to compensate for poor sperm production by increasing **follicle-stimulating hormone (FSH)**, leading to **elevated FSH levels**. - In **vas deferens obstruction**, the testes are producing sperm normally, so the pituitary does not need to overstimulate them, resulting in **normal FSH levels**. *Testicular FNAC* - **Fine needle aspiration cytology (FNAC)** of the testis can *confirm* the presence or absence of sperm production but is not the primary diagnostic test to *differentiate* between the two conditions without prior hormonal assessment. - It is an **invasive procedure** typically considered after initial hormone testing and physical examination. *Testosterone levels* - **Testosterone levels** primarily reflect the Leydig cell function and can be normal in both **testicular failure** (especially germ cell-specific failure) and **vas deferens obstruction**. - While low testosterone can indicate Leydig cell dysfunction, it doesn't specifically differentiate between the two causes of azoospermia in all cases. *Karyotyping* - **Karyotyping** is used to detect **chromosomal abnormalities** (e.g., Klinefelter syndrome) that can cause testicular failure. - While important for identifying underlying genetic causes, it does not directly differentiate between existing testicular failure and vas deferens obstruction based on direct physiological function.
Question 3: Congenital adrenal hyperplasia is the most common cause of
- A. True hermaphroditism
- B. Female pseudohermaphroditism (androgenized female 46XX) (Correct Answer)
- C. Male pseudohermaphroditism (underandrogenized male 46XY)
- D. Turner's syndrome
Explanation: ***Female pseudohermaphroditism (androgenized female 46XX)*** - Congenital adrenal hyperplasia (CAH), particularly **21-hydroxylase deficiency**, leads to overproduction of **adrenal androgens**. [3] - In a 46,XX fetus, this excess androgen exposure results in masculinization of external genitalia, while internal female organs (uterus, ovaries) are present, defining **female pseudohermaphroditism**. [3] *True hermaphroditism* - Characterized by the presence of both **ovarian and testicular tissue** in the same individual. [2] - This condition is rare and not directly caused by the hormonal imbalances seen in CAH. *Male pseudohermaphroditism (underandrogenized male 46XY)* - Occurs in individuals with a **46,XY karyotype** who have testes but whose external genitalia are ambiguous or female due to **insufficient androgen production or action**. - Conditions like **androgen insensitivity syndrome** or defects in testosterone synthesis cause this, not CAH. [3] *Turner's syndrome* - A chromosomal disorder with a **45,XO karyotype**, primarily affecting females. [1] - It is characterized by features such as **short stature**, gonadal dysgenesis (streak gonads), and various congenital anomalies, and it is not a form of pseudohermaphroditism related to adrenal function. [1]
Question 4: Which of the following diuretics can lead to erectile dysfunction?
- A. Thiazide diuretics (Correct Answer)
- B. Carbonic anhydrase inhibitor
- C. Loop diuretics
- D. Mannitol
Explanation: ***Thiazide diuretics*** - **Thiazide diuretics** can cause **erectile dysfunction**, possibly due to effects on vascular function and **reduced blood flow** to the penis. - This adverse effect is a known concern and can impact patient adherence to **antihypertensive therapy**. *Carbonic anhydrase inhibitor* - **Carbonic anhydrase inhibitors** like acetazolamide are primarily used for glaucoma, altitude sickness, and metabolic alkalosis, and do not typically cause **erectile dysfunction**. - Their primary side effects relate to **metabolic acidosis** and electrolyte imbalances, not sexual function. *Loop diuretics* - **Loop diuretics** like furosemide are potent diuretics used in conditions like heart failure and edema; **erectile dysfunction** is not a common or significant side effect. - Their main adverse effects include **hypokalemia**, ototoxicity, and hypovolemia. *Mannitol* - **Mannitol** is an osmotic diuretic used to reduce intracranial and intraocular pressure. - It is administered intravenously and its side effects primarily involve **fluid and electrolyte disturbances**, not **erectile dysfunction**.
Question 5: Organic cause for erectile dysfunction is most commonly:
- A. Psychological
- B. Neuronal
- C. Vascular (Correct Answer)
- D. Hormonal
Explanation: ***Vascular*** - **Vascular disease** is the most common organic cause of erectile dysfunction, primarily due to conditions like **atherosclerosis** affecting penile arteries [3]. - Reduced blood flow to the penis, essential for achieving and maintaining an erection, directly results from vascular impairment [2]. *Psychological* - While **psychological factors** are common causes of ED, they are considered non-organic, involving anxiety, stress, or relationship issues [1]. - Psychological ED often presents with normal nocturnal erections, which are absent in organic causes. *Neuronal* - **Neuronal causes** (e.g., spinal cord injury, **multiple sclerosis**, diabetic neuropathy) can lead to ED but are less frequent than vascular causes [2]. - These conditions disrupt nerve signals necessary for penile erection, but typically involve other neurological symptoms. *Hormonal* - **Hormonal imbalances**, such as low testosterone (hypogonadism), contribute to ED but are responsible for a smaller percentage of cases compared to vascular issues [3]. - Patients with hormonal ED may also experience decreased libido, fatigue, and other symptoms related to the specific hormone deficiency.
Question 6: For the following causes of sexual dysfunction, select the most likely clinical feature that can be caused by vascular disease.
- A. failure of erection with absent nocturnal penile tumescence (NPT) (Correct Answer)
- B. absence of orgasm with normal libido and erectile function
- C. ejaculatory dysfunction
- D. decreased libido
Explanation: **_failure of erection with absent nocturnal penile tumescence (NPT)_** - **Vascular disease** often impairs blood flow to the penis, which is essential for achieving and maintaining an erection [1]. - **Absent nocturnal penile tumescence (NPT)** indicates an organic cause of erectile dysfunction, frequently due to vascular insufficiency rather than psychological factors [1], [2]. *ejaculatory dysfunction* - While ejaculatory dysfunction can occur with sexual health issues, it is less directly linked to the **vascular supply** than erectile function [2]. - Conditions like **neurological damage** or medication side effects are more common causes of ejaculatory dysfunction [2]. *absence of orgasm with normal libido and erectile function* - An inability to achieve orgasm with intact libido and erectile function typically suggests a **neurological** or **psychological** etiology. - **Vascular disease** primarily affects the physical ability to achieve an erection, not the sensory or psychological components of orgasm [1]. *decreased libido* - **Decreased libido (sex drive)** is more commonly associated with hormonal imbalances (e.g., low testosterone), psychological stress, depression, or certain medications [1]. - While vascular disease can contribute to overall poor health, it is not a direct or primary cause of **reduced sexual desire** [1].
Question 7: Which of the following is a cause of male infertility?
- A. Idiopathic
- B. Yq11 microdeletion
- C. Varicocele
- D. All of the options (Correct Answer)
Explanation: ***All of the options*** - **Idiopathic**, **varicocele**, and **Yq11 microdeletion** are all recognized causes of male infertility, making this the most comprehensive and correct answer. - Male infertility can stem from a variety of factors, including genetic, structural, hormonal, and unexplained (idiopathic) causes. *Idiopathic* - Refers to cases where no specific cause for infertility can be identified despite thorough investigation, accounting for a significant proportion of male infertility. - This diagnosis is made by **exclusion** after ruling out other known causes. *Varicocele* - A common and treatable cause of male infertility, characterized by **dilated veins in the pampiniform plexus** of the scrotum. - Varicoceles can impair sperm production and function due to **increased scrotal temperature** and oxidative stress. *Yq11 microdeletion* - Refers to deletions in the **azoospermia factor (AZF) region** on the long arm of the Y chromosome, which are genetic causes of severe spermatogenic failure. - These deletions disrupt genes essential for sperm production, leading to conditions ranging from **oligozoospermia** (low sperm count) to **azoospermia** (absence of sperm).
Question 8: In a case of alleged child sexual abuse, a 12-year-old girl shows healed complete hymenal transection at 7 o'clock position reaching the base, normal anal examination, and negative biological evidence. Medical history reveals road traffic accident 6 months ago with perineal injury. Synthesize the BEST medicolegal opinion.
- A. Complete transection confirms penetrative sexual abuse regardless of history
- B. Normal anal examination excludes any form of sexual abuse
- C. RTA-related straddle injury consistent with complete tear, sexual abuse not proven (Correct Answer)
- D. Recent sexual abuse with complete healing, biological evidence degraded
Explanation: ***RTA-related straddle injury consistent with complete tear, sexual abuse not proven*** - A **complete hymenal transection** reaching the base can be caused by accidental **straddle injuries** sustained during a **road traffic accident (RTA)**, creating a diagnostic dilemma. - In the absence of **biological evidence** and considering the documented history of **perineal injury**, the findings are consistent with past trauma and do not definitively prove **sexual abuse**. *Complete transection confirms penetrative sexual abuse regardless of history* - While a **complete tear** to the base is a strong indicator of **penetration**, it is not pathognomonic for abuse when a significant **accidental history** is present. - Medicolegal opinions must integrate the **clinical history** of prior accidents to avoid false accusations when physical findings have alternative causes. *Normal anal examination excludes any form of sexual abuse* - A normal **perianal and anal examination** only suggests a lack of trauma to that specific area; it does not rule out **vaginal penetration** or other forms of abuse. - Many cases of documented **child sexual abuse** present with no physical findings or localized trauma to only one anatomical site. *Recent sexual abuse with complete healing, biological evidence degraded* - **Complete healing** of a full hymenal transection typically takes longer than the "recent" period, and the 6-month-old **RTA history** is a more chronologically plausible cause. - Negative **biological evidence** is common in older injuries, but the presence of a known **extragenital trauma** provides a more likely explanation for the **healed scar** than unspecified recent abuse.
Question 9: A forensic expert examines a 28-year-old alleged rape victim 72 hours post-incident. Vulval swab negative for spermatozoa and PSA, but high vaginal swab shows presence of sperm heads without tails. Internal examination shows old hymenal scars. Evaluate the MOST valid medicolegal conclusion.
- A. Contaminated sample, repeat examination required
- B. Sexual assault occurred approximately 48-72 hours ago, victim not virgin (Correct Answer)
- C. No evidence of recent sexual intercourse, false allegation
- D. Recent consensual intercourse, assault claim invalid
Explanation: ***Sexual assault occurred approximately 48-72 hours ago, victim not virgin*** - Spermatozoa lose their **tails** after 24 hours in the vagina, and **heads** can persist in the **high vaginal swab** for up to 3 to 4 days (72-96 hours). - The presence of **old hymenal scars** indicates the victim is not a virgin, and the absence of **PSA (Prostate Specific Antigen)** is expected as it typically disappears within 24-48 hours. *Contaminated sample, repeat examination required* - The findings are consistent with the **natural degradation timeline** of biological evidence and do not suggest contamination. - Repeating the examination after 72 hours would likely yield even less evidence due to **phagocytosis** and drainage of vaginal contents. *No evidence of recent sexual intercourse, false allegation* - The presence of **sperm heads** in the high vaginal swab constitutes definitive medical evidence of recent **seminal deposition** or intercourse. - A negative **vulval swab** and negative **PSA** only indicate that the event was not immediate (less than 24 hours), not that it didn't happen. *Recent consensual intercourse, assault claim invalid* - Forensic examination can confirm **recent intercourse** through biological evidence but cannot medically distinguish between **consensual** and **non-consensual** acts. - The legal determination of **assault** depends on the lack of consent and other circumstantial evidence, not merely the presence or absence of sperm.
Question 10: A 22-year-old woman alleges rape. Examination shows annular hymen with no tears but notch at 3 o'clock position extending to base. PSA positive vaginal swab, no spermatozoa seen. Which interpretation is MOST appropriate?
- A. Recent intercourse but virginity status indeterminate
- B. Recent sexual intercourse confirmed, virgin before assault
- C. Old healed tear, assault claim contradicted
- D. Congenital notch, recent intercourse confirmed (Correct Answer)
Explanation: ***Congenital notch, recent intercourse confirmed*** - A **notch** at the 3 o'clock or 9 o'clock position in the hymen is typically considered a **congenital variation** resulting from embryological fusion rather than a traumatic tear. - The presence of **Prostate Specific Antigen (PSA)** on the vaginal swab is a highly specific marker for semen, confirming **recent sexual intercourse** even in the absence of spermatozoa. *Recent intercourse but virginity status indeterminate* - While PSA confirms recent intercourse, the description of a notch at 3 o'clock helps distinguish between **congenital** and traumatic findings, allowing for a more specific interpretation than "indeterminate." - Traumatic hymeneal tears in sexual assault usually occur in the **posterior segment** (between 4 and 8 o’clock), which are missing here. *Recent sexual intercourse confirmed, virgin before assault* - The absence of recent tears does not prove she was a **virgin** prior to the assault, as the hymen can be elastic or have a **congenital notch** independent of previous activity. - Medical examination can confirm signs of trauma or semen, but it cannot definitively certify the legal status of **virginity**. *Old healed tear, assault claim contradicted* - **Congenital notches** are frequently misidentified as old healed tears; however, tears typically heal by forming **cicatrix** or scar tissue and are rarely located at the 3 o'clock position. - The presence of PSA confirms recent sexual contact, which supports the physical possibility of the **assault claim** rather than contradicting it.
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