'Setting sun' sign is a classical feature of?

NORCET 3 - 2022 (Shift-1)

Child Health Nursing (Pediatrics)

Easy

Appeared in: NORCET 3 - 2022 (Shift-1)

Explanation

The 'setting sun' sign is a hallmark of hydrocephalus in infants, directly resulting from increased intracranial pressure.
Excess cerebrospinal fluid (CSF) causes ventricular enlargement, which compresses the midbrain's tectal plate.
This pressure leads to paralysis of upward gaze, causing the eyes to deviate downward and reveal the sclera above the iris, as seen in the image.
It is a significant neurological sign indicating the need for urgent medical evaluation.

Option B: Meningitis is an infection of the meninges. While it can cause increased ICP and a bulging fontanelle, its classic signs are fever, nuchal rigidity (neck stiffness), and photophobia. The setting sun sign is not a characteristic feature.
Option C: Encephalitis is inflammation of the brain tissue itself. It typically presents with altered mental status, seizures, and focal neurological deficits. The setting sun sign is not a primary sign of encephalitis.
Option D: Parkinson's disease is a progressive neurodegenerative disorder affecting adults, characterized by resting tremor, bradykinesia (slow movement), and rigidity. It is entirely unrelated to the pediatric condition and signs shown.

Visual 1: Diagram - An illustration showing the enlarged ventricles in hydrocephalus and how they compress the midbrain tectum, causing the setting sun sign.
Visual 2: Photo - A clinical photograph of an infant with a bulging anterior fontanelle, another key sign of hydrocephalus.
Visual 3: Flowchart - A flowchart depicting the production, flow, and absorption of CSF, highlighting potential points of obstruction that lead to hydrocephalus.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Clinical signs of Hydrocephalus in infants as background academic context rather than a clinical decision trigger.
Recognizing the 'setting sun' sign is a critical nursing skill. It is a red flag for increased intracranial pressure in an infant and constitutes a neurological emergency.
Prompt reporting of this sign can lead to early diagnosis and intervention (e.g., shunt placement), preventing irreversible brain damage and developmental delays.
What if? If the 'setting sun' sign suddenly appears in a child who already has a ventriculoperitoneal (VP) shunt for hydrocephalus, it is a strong indicator of shunt malfunction or blockage. This requires immediate neurosurgical consultation.

How to Approach the Question

First, analyze the image provided. Identify the key clinical finding: the infant's eyes are deviated downwards, with sclera visible above the iris.
Recognize this as the 'setting sun' sign, a specific term mentioned in the question stem.
Recall or deduce that this sign is pathognomonic for increased intracranial pressure in an infant.
Evaluate the options to determine which condition is the most common cause of chronic increased ICP and this specific sign in infancy. Hydrocephalus is the classic cause.
Eliminate other options: Meningitis and encephalitis have different primary presentations (fever, stiffness, seizures), and Parkinson's is an adult disease.

Concept Tested & Keywords

Concept Tested: Clinical signs of Hydrocephalus in infants.
Stem keywords: 'Setting sun' sign, classical feature
Lead-in keywords: is a classical feature of
Clinical cues: The image of an infant with downward eye deviation is a critical cue.

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