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Benign "setting sun" phenomenon in full-term infants.

Hideto Yoshikawa1

  • 1Department of Pediatrics, Niigata City General Hospital, Shichikuyama, Japan. hideto@hosp.niigata.niigata.jp

Journal of Child Neurology
|July 31, 2003
PubMed
Summary

Benign "setting sun" phenomenon, characterized by downward eye deviation, can occur in healthy infants up to 6-7 months. This finding suggests normal development is possible despite this neurological sign.

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Area of Science:

  • Pediatrics
  • Neonatology
  • Neurology

Background:

  • The "setting sun" phenomenon, or downward gaze deviation, typically signals severe neurological issues in infants.
  • While rare, it can be observed in healthy full-term infants up to 5 months old.

Observation:

  • This report details two typically developing male infants who exhibited transient downward eye deviation during sucking and crying.
  • The "setting sun" sign was not apparent until 6 and 7 months of age in these infants.
  • No other clinical or laboratory abnormalities were detected, and both infants demonstrated normal developmental trajectories.

Findings:

  • The study identified a benign presentation of the "setting sun" phenomenon in two infants, persisting until 6-7 months of age.
  • This contrasts with the typical presentation, which usually resolves by 5 months or indicates underlying pathology.

Implications:

  • The findings suggest that the "setting sun" phenomenon can manifest benignly in normal infants for a longer duration than previously recognized.
  • This expands the understanding of normal neurological development and the differential diagnosis of the "setting sun" sign in pediatrics.

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