A fetus is diagnosed with a single umbilical artery (SUA). SUA is not associated with which of the following… - NORCET 9 Prelims-2025

NORCET 9 Prelims-2025

Obstetrics & Gynaecology

Hard

Appeared in: NORCET 9 Prelims-2025

Explanation

Esophageal Atresia is the correct choice as it is considered the least directly associated anomaly with a single umbilical artery (SUA) among the given options.
While Esophageal Atresia is linked to SUA, this association is primarily through the VACTERL complex (Vertebral, Anal, Cardiac, Tracheo-Esophageal, Renal, Limb defects), where SUA is a common finding.
The other options—Imperforate Anus, Renal anomalies, and Genitourinary Abnormality—are caudal (lower body) defects that have a stronger, more direct embryological connection to the structures developing alongside the umbilical arteries.
Therefore, in a question asking what is 'not associated,' the most indirect or least frequent association is the intended answer.

Option A: Imperforate Anus (or Anal Atresia) is a well-established association with SUA. It is a key component of the VACTERL association, where SUA is frequently observed.
Option B: Renal anomalies are one of the most common groups of abnormalities found in fetuses with SUA. The umbilical arteries and parts of the urinary system have a close developmental origin.
Option D: This is a broad category that includes renal anomalies. Genitourinary abnormalities are very frequently associated with SUA, making this option incorrect.

Visual 1: Diagram - The VACTERL Association. An infographic showing the different body systems affected in VACTERL (Vertebral, Anal, Cardiac, Tracheo-Esophageal, Renal, Limb) to illustrate how these anomalies are grouped.
Visual 2: Illustration - Umbilical Cord Cross-Section. A side-by-side comparison showing a normal cord with two arteries and one vein (AVA) versus a single umbilical artery (SUA) cord with one artery and one vein.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Congenital anomalies associated with a single umbilical artery (SUA) as background academic context rather than a clinical decision trigger.
The identification of a single umbilical artery on a prenatal ultrasound is a significant finding that should trigger a comprehensive fetal anatomical survey.
Nurses should be aware that an SUA finding necessitates careful examination for associated anomalies, particularly of the heart (echocardiogram) and kidneys.
Patient counseling is crucial. While an isolated SUA can be a normal variant with no adverse outcomes, the risk of associated anomalies requires thorough investigation and clear communication with the parents.

How to Approach the Question

First, identify the key concept in the question stem: 'single umbilical artery (SUA)'.
Next, analyze the lead-in phrase: 'not associated with'. This signals that you need to find the option that does not have a link to SUA.
Recall or look up the common associations with SUA. You will find that SUA is linked to renal, cardiovascular, gastrointestinal, and musculoskeletal anomalies, often as part of syndromes like VACTERL or chromosomal abnormalities.
Evaluate each option: A) Imperforate Anus, B) Renal anomalies, and D) Genitourinary Abnormality are all very strong, classic associations with SUA.
Option C) Esophageal Atresia is also a known association, but primarily as a component of the VACTERL complex.
Recognize that in 'best answer' questions, when all options seem plausible, you must choose the one that is the 'exception' or has the weakest link. The connection to Esophageal Atresia is less direct than the others, which have strong embryological ties to caudal structures.

Concept Tested & Keywords

Concept Tested: Congenital anomalies associated with a single umbilical artery (SUA).
Stem keywords: fetus, single umbilical artery, SUA
Lead-in keywords: not associated with
Clinical cues: Diagnosis of single umbilical artery (SUA)
Negative lead-in flag: The question asks which condition is NOT associated with SUA. In practice, all listed conditions can be associated. The question requires identifying the option with the weakest or most indirect link.

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