Anorectal Malformations — MCQs
Which of the following is NOT a feature of hypospadias?
X-ray can detect congenital anorectal malformation at –
Which one of the following life-threatening congenital anomalies in the newborn presents with polyhydramnios, aspiration pneumonia, excessive salivation and difficulty in passing a nasogastric tube?
What structure is primarily responsible for forming the anorectal angle?
Moschcowitz repair is done for:
A child is being assessed for possible intussusception; which of the following would be LEAST likely to provide valuable information?
What is the treatment of choice for anal carcinoma?
The risk of recurrence of congenital heart disease for subsequent pregnancies in families with one affected child is:
A newborn male infant presents with the findings shown in the image. The clinical diagnosis is?
A newborn presenting with intestinal obstruction showed multiple air fluid levels on abdominal X-ray. Which of the following is NOT a likely diagnosis?
Anorectal Malformations Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is NOT a feature of hypospadias?
- A. Chordee
- B. Hooded prepuce
- C. Cryptorchidism (Correct Answer)
- D. Ventral urethral meatus
Explanation: ***Cryptorchidism*** - While **cryptorchidism** (undescended testes) can sometimes co-occur with hypospadias (in up to 10% of cases, especially severe proximal types), it is **NOT a defining feature or characteristic of hypospadias itself**. - Hypospadias is primarily a malformation of the urethra and penis, whereas cryptorchidism is a distinct abnormality of testicular descent. - They are separate congenital anomalies that may share common developmental pathways but are not causally related. *Chordee* - **Chordee** is a common associated feature of hypospadias, present in approximately 15-20% of cases. - It is characterized by ventral curvature of the penis, particularly noticeable during erection, due to fibrous tissue tethering the ventral aspect. - Often requires surgical correction along with hypospadias repair. *Hooded prepuce* - A **hooded prepuce** (dorsal hood) is a **classic and consistent feature** of hypospadias, present in the majority of cases. - The foreskin does not fully encircle the glans but instead forms a hood on the dorsal aspect, with ventral deficiency. - This occurs due to incomplete fusion of the urethral folds and arrested development of the ventral foreskin. *Ventral urethral meatus* - A **ventral urethral meatus** (urethral opening on the underside of the penis rather than at the tip) is the **defining feature** of hypospadias. - The location can vary from glandular (on the glans) to coronal, penile shaft, penoscrotal, or perineal positions. - This is the primary anatomical abnormality that characterizes the condition.
Question 2: X-ray can detect congenital anorectal malformation at –
- A. 24–48 hours
- B. 48–72 hours (Correct Answer)
- C. Immediately after birth
- D. After 72 hours
Explanation: ***48–72 hours*** - This timeframe is preferred for X-ray detection of **congenital anorectal malformation** because it allows for adequate **gas accumulation** in the bowel. - The gas acts as a natural contrast agent, making the distal end of the rectum visible on the X-ray and helping determine the **level of the anomaly**. *24–48 hours* - While gas may begin to accumulate by this time, it might not be sufficient to clearly delineate the **level of the rectal pouch** in all cases. - A delay is often beneficial to ensure optimal imaging conditions for **accurate surgical planning**. *Immediately after birth* - Performing an X-ray immediately after birth is often too early as there hasn't been sufficient **time for gas to fill the bowel** distal to the obstruction. - This can lead to **inaccurate assessment** of the malformation's type and level. *After 72 hours* - While sufficient gas is present, delaying beyond 72 hours may unnecessarily delay **surgical intervention**. - Additionally, if gas distension becomes excessive, it could potentially complicate the **interpretation of the exact anatomy**.
Question 3: Which one of the following life-threatening congenital anomalies in the newborn presents with polyhydramnios, aspiration pneumonia, excessive salivation and difficulty in passing a nasogastric tube?
- A. Choanal atresia
- B. Gastroschisis
- C. Diaphragmatic hernia
- D. Tracheo-esophageal fistula (Correct Answer)
Explanation: ***Tracheo-esophageal fistula*** - This condition presents with **polyhydramnios** due to the fetus being unable to swallow amniotic fluid, **excessive salivation** from accumulated secretions in the blind-ending esophageal pouch, and difficulty passing a **nasogastric tube** because of the esophageal obstruction. - **Aspiration pneumonia** is a common complication as saliva and gastric contents can be aspirated into the lungs through the fistula. *Choanal atresia* - Characterized by **blocked nasal passages**, leading to **cyclical cyanosis** relieved by crying, but not typically associated with polyhydramnios or excessive salivation in this manner. - While it can cause respiratory distress, it does not involve esophageal obstruction or directly cause aspiration pneumonia from swallowed fluids. *Gastroschisis* - This is an **abdominal wall defect** where intestines protrude outside the body, unrelated to swallowing difficulties, polyhydramnios caused by inability to swallow, or excessive salivation. - It does not involve difficulty in passing a nasogastric tube or directly cause aspiration pneumonia. *Diaphragmatic hernia* - Involves **abdominal contents herniating into the chest cavity**, leading to **pulmonary hypoplasia** and respiratory distress. - It does not explain polyhydramnios due to impaired swallowing, excessive salivation, or the characteristic inability to pass a nasogastric tube.
Question 4: What structure is primarily responsible for forming the anorectal angle?
- A. Circular smooth muscle layer
- B. Longitudinal smooth muscle layer
- C. Puborectalis muscle (Correct Answer)
- D. Internal anal sphincter muscle
Explanation: ***Puborectalis muscle*** - The **puborectalis muscle** is a U-shaped sling of skeletal muscle that originates from the pubis and loops around the posterior aspect of the anorectal junction, pulling the rectum anteriorly [1]. - This anterior traction creates the characteristic **anorectal angle**, which is crucial for maintaining fecal continence at rest [1], [2]. *Circular smooth muscle layer* - The **circular smooth muscle layer** is part of the involuntary muscular wall of the rectum and anal canal. - While it contributes to internal anal sphincter function, its primary role is not in forming the acute anorectal angle [2]. *Longitudinal smooth muscle layer* - The **longitudinal smooth muscle layer** runs along the entire gastrointestinal tract, including the rectum, and contributes to the overall structure and peristalsis. - It does not directly form the anorectal angle; that function is specific to the puborectalis muscle. *Internal anal sphincter muscle* - The **internal anal sphincter** is an involuntary smooth muscle thickening of the circular muscle layer, primarily responsible for resting anal tone [2]. - It plays a vital role in continence but does not contribute to the creation of the anorectal angle [2].
Question 5: Moschcowitz repair is done for:
- A. Vault prolapse
- B. Adenomyosis
- C. Enterocele (Correct Answer)
- D. Chronic inversion of uterus
Explanation: ***Enterocele*** - The **Moschcowitz repair** is a historical procedure designed to repair an **enterocele** by obliterating the cul-de-sac. - It involves placing a series of high **purse-string sutures** in the posterior cul-de-sac peritoneum to elevate it and prevent bowel herniation. *Vault prolapse* - Vault prolapse involves the **prolapse of the vaginal apex** after hysterectomy. - While it can coexist with an enterocele, the Moschcowitz repair specifically targets the **enterocele defect**, not the overall vault support. *Adenomyosis* - **Adenomyosis** is a condition where endometrial tissue grows into the muscular wall of the uterus. - It is managed medically or surgically via **hysterectomy**, and is unrelated to surgical repairs for pelvic organ prolapse. *Chronic inversion of uterus* - **Chronic uterine inversion** is a rare condition where the uterus turns inside out, typically following childbirth. - Management involves **manual or surgical repositioning of the uterus** and is unrelated to the Moschcowitz repair for enterocele.
Question 6: A child is being assessed for possible intussusception; which of the following would be LEAST likely to provide valuable information?
- A. Pain pattern
- B. Family history (Correct Answer)
- C. Abdominal palpation
- D. Stool inspection
Explanation: ***Family history*** - Intussusception is typically an **acute pediatric condition** with no strong genetic predisposition. - While certain genetic syndromes can increase risk, general family history of other conditions is **not directly relevant** to confirming or ruling out intussusception. *Pain pattern* - The classic **intermittent, colicky abdominal pain** that recurs every 15-20 minutes is a hallmark symptom of intussusception. - This pattern provides crucial diagnostic information about the **bowel telescoping and transient obstruction**. *Abdominal palpation* - Palpation can reveal a **sausage-shaped abdominal mass**, especially in the right upper quadrant, which is a classic physical finding. - Tenderness, distension, and signs of peritonitis can also be detected, indicating **bowel obstruction or perforation**. *Stool inspection* - The presence of "**currant jelly stool**" (blood and mucus) is a highly characteristic sign of intussusception, resulting from venous congestion and sloughing of the intestinal mucosa. - This finding provides clear evidence of **intestinal ischemia and bleeding**.
Question 7: What is the treatment of choice for anal carcinoma?
- A. Chemotherapy alone
- B. APR combined with radiotherapy
- C. Chemoradiation (Correct Answer)
- D. All of the options
Explanation: ***Chemoradiation*** - This combined modality is the **standard of care** for most anal carcinomas, achieving high cure rates while preserving sphincter function. - The combination of **chemotherapy** (e.g., 5-fluorouracil and mitomycin C) and **external beam radiation** works synergistically to destroy cancer cells. *Chemotherapy alone* - **Chemotherapy alone** is generally insufficient as a primary treatment for anal carcinoma. - It is often used in combination with radiation or for **metastatic disease**, but not as a monotherapy for curative intent in localized disease. *APR combined with radiotherapy* - **Abdominoperineal resection (APR)** combined with radiotherapy is typically reserved for **recurrent** or **persistent anal carcinoma** after failed chemoradiation, or for very advanced tumors. - APR is a highly morbid surgery leading to a **permanent colostomy**, and primary chemoradiation aims to avoid this outcome. *All of the options* - As **chemoradiation** is the preferred first-line treatment and other options are either inadequate or reserved for specific situations, stating "all of the options" is incorrect. - The treatment strategy for anal carcinoma involves a nuanced approach, prioritizing **organ preservation** with effective cancer control.
Question 8: The risk of recurrence of congenital heart disease for subsequent pregnancies in families with one affected child is:
- A. 10-12%
- B. 1%
- C. 2-6% (Correct Answer)
- D. 0.80%
Explanation: ***2-6%*** - The recurrence risk for **congenital heart disease (CHD)** in subsequent pregnancies after one affected child is generally cited as **2-6%**, reflecting an increased familial predisposition. - This risk is higher than the general population risk but still relatively low, primarily due to the complex, multifactorial etiology of most CHDs. *10-12%* - A **10-12% recurrence risk** is generally too high for most common congenital heart defects, which are typically multifactorial. - Such a high risk might be seen in specific **syndromic forms** of CHD (e.g., genetic aneuploidies or single gene defects), but not for isolated CHD in general. *1%* - A **1% recurrence risk** is comparable to the general population incidence of congenital heart disease (approximately 0.8-1%). - This value does not adequately reflect the established **increased risk for siblings** of an affected child, which is known to be higher than the background population risk. *0.80%* - **0.80%** represents the approximate **general population incidence** of congenital heart disease in live births without a prior affected sibling. - This figure does not account for the **increased familial risk** that exists once one child in a family is already affected.
Question 9: A newborn male infant presents with the findings shown in the image. The clinical diagnosis is?
- A. Hypospadias
- B. Micro-penis
- C. Mauriac syndrome
- D. Epispadias (Correct Answer)
Explanation: ***Epispadias*** - The image depicts a severe form of **epispadias**, characterized by the exposed **bladder mucosa (exstrophy)** and a penile shaft that is short, dorsally curved, and has the urethral opening on the dorsal surface. - This congenital anomaly results from a failure of the abdominal wall and bladder to close properly during fetal development, often presenting with a **widened pubic symphysis**. *Hypospadias* - **Hypospadias** is a condition where the **urethral opening** is located on the **ventral** (underside) surface of the penis, not the dorsal surface as seen in the image. - While it can involve chordee (penile curvature), it typically does not present with bladder exstrophy. *Micro-penis* - **Micropenis** refers to a penis that is **abnormally small** in length, but otherwise structurally normal. - It describes the size of the penis, not an anomalous opening or exposed internal organs, and is not consistent with the image. *Mauriac syndrome* - **Mauriac syndrome** is a rare complication of poorly controlled **Type 1 diabetes** in children, characterized by growth retardation, delayed puberty, hepatomegaly, and Cushingoid features. - It is an **endocrine disorder** and has no direct relevance to the anatomical abnormality shown in the image.
Question 10: A newborn presenting with intestinal obstruction showed multiple air fluid levels on abdominal X-ray. Which of the following is NOT a likely diagnosis?
- A. Pyloric obstruction (Correct Answer)
- B. Duodenal atresia
- C. Ileal atresia
- D. Ladd's bands
Explanation: **Explanation:** The presence of **multiple air-fluid levels** on an abdominal X-ray indicates a **low intestinal obstruction** (distal to the duodenum). **1. Why Pyloric Obstruction is the Correct Answer:** In **Pyloric obstruction** (such as Infantile Hypertrophic Pyloric Stenosis), the blockage is at the gastric outlet. Since the obstruction is proximal to the small intestine, air cannot pass into the bowel loops. The X-ray typically shows a **single large gastric air bubble** with little to no gas distally. Therefore, multiple air-fluid levels are never seen in this condition. **2. Analysis of Incorrect Options:** * **Duodenal Atresia:** While classically associated with the "double bubble" sign, if there is a partial obstruction or distal transition, it can present with fluid levels. However, it is more proximal than ileal atresia. * **Ileal Atresia:** This is a classic cause of **low intestinal obstruction**. The multiple dilated loops of small bowel proximal to the atresia fill with air and fluid, creating the characteristic "stepladder" appearance of multiple air-fluid levels. * **Ladd’s Bands:** These are fibrous stalks associated with **Malrotation**. They can compress the duodenum or cause midgut volvulus. If the obstruction is significant, it leads to proximal bowel dilatation and multiple air-fluid levels. **Clinical Pearls for NEET-PG:** * **Single Bubble:** Pyloric stenosis. * **Double Bubble:** Duodenal atresia (associated with Down Syndrome). * **Triple Bubble:** Jejunal atresia. * **Multiple Air-Fluid Levels:** Ileal atresia, Meconium ileus, or Hirschsprung’s disease. * **Ground Glass Appearance:** Suggestive of Meconium ileus (Neuhauser’s sign).
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