Which congenital anomaly is characterized by incomplete closure of the abdominal wall with protrusion of intestines which is covered with protective membrane?

Appeared in: RRB Nsg Superintendent -29 April 2025 (Shift-1st)

Explanation

Omphalocele is a congenital malformation where abdominal contents herniate through the umbilical ring into the base of the umbilical cord.
The defining characteristic of an omphalocele is that the herniated viscera are covered by a protective sac consisting of the peritoneum on the inside and the amnion on the outside.
This condition results from the failure of the embryonic gut to return to the abdominal cavity during fetal development.
The presence of this covering membrane is the primary feature that distinguishes it from gastroschisis.

Option A: Diaphragmatic hernia is an internal defect where abdominal organs protrude into the thoracic (chest) cavity through an opening in the diaphragm, not externally through the abdominal wall.
Option B: In gastroschisis, the intestines protrude through a full-thickness abdominal wall defect, but they are not covered by a protective sac. The bowel is directly exposed to the amniotic fluid.
Option C: An umbilical hernia is a protrusion at the umbilical ring, but it is covered by skin and subcutaneous tissue, not a thin, translucent membrane like an omphalocele.

Visual 1: Diagram - A side-by-side comparison of an omphalocele and gastroschisis. The diagram should clearly label the umbilical cord, the presence of the sac in omphalocele, and the absence of the sac with exposed bowel in gastroschisis.
Visual 2: Clinical Image - A photograph of a newborn with an omphalocele, highlighting the translucent sac containing abdominal organs at the base of the umbilical cord.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Congenital Abdominal Wall Defects as background academic context rather than a clinical decision trigger.
Immediate nursing care for a newborn with an omphalocele is critical and focuses on protecting the sac from injury, infection, and fluid loss. The sac must be handled gently and kept covered with sterile, moist dressings.
Rupture of the omphalocele sac is a surgical emergency as it exposes the sterile abdominal contents to bacteria, leading to a high risk of peritonitis and sepsis.
Infants with omphalocele have a high incidence (50-70%) of other congenital anomalies, especially cardiac defects and chromosomal abnormalities (e.g., Trisomy 13, 18, Beckwith-Wiedemann syndrome), requiring a thorough systemic evaluation.

How to Approach the Question

First, break down the question to identify the key clinical features: 1) a congenital abdominal wall defect, 2) protrusion of intestines, and 3) the presence of a 'protective membrane'.
The third feature, the 'protective membrane', is the most crucial differentiator.
Evaluate each option against this key feature.
Eliminate 'Diaphragmatic hernia' as it is an internal defect involving the chest cavity.
Compare 'Omphalocele' and 'Gastroschisis'. Recall that omphalocele has a covering sac, while gastroschisis does not. The question specifies a membrane is present.
Eliminate 'Umbilical hernia' because its covering is skin, not a simple membrane.

Concept Tested & Keywords

Concept Tested: Congenital Abdominal Wall Defects
Stem keywords: congenital anomaly, incomplete closure, abdominal wall, protrusion of intestines, protective membrane
Lead-in keywords: Which
Clinical cues: The defining feature is the presence of a 'protective membrane' covering the protruding intestines, which is the key to differentiating between omphalocele and gastroschisis.
Negative lead-in flag: false

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Practise the full RRB Nsg Superintendent -29 April 2025 (Shift-1st)

Attempt every question from this paper in a timed mock, then review the full solution for each one.