Persistent cervical thymus with a small cyst in a newborn infant

Area of Science:

• Pediatric Surgery
• Developmental Biology
• Endocrinology

Background:

• The thymus gland is crucial for immune system development.
• Abnormal descent of the thymus can lead to ectopic locations, such as the neck.
• Thymic cysts can form from developmental anomalies or degeneration.

Observation:

• A one-month-old male infant presented with a palpable neck mass.
• Surgical exploration revealed the mass to be a cervical thymus with an associated cyst.
• The cervical thymus appeared to be undergoing degeneration.

Findings:

• The diagnosed condition was a cervical thymus with a thymic cyst.
• This likely resulted from abnormal descent and subsequent degeneration of the thymus.
• Detection of cervical thymus or thymic cyst in infants under one year is exceedingly rare.

Implications:

• Highlights the spectrum of thymic developmental anomalies.
• Underscores the importance of considering ectopic thymus in pediatric neck masses.
• Provides insight into the natural history of degenerated cervical thymus and thymic cysts.