Parasitic colloid cyst: A diagnostic dilemma.

Area of Science:

• Pathology
• Endocrinology
• Surgical Oncology

Background:

• Neck swellings present diverse pathologies, often causing diagnostic challenges.
• Thyroid-related conditions typically manifest as midline neck masses.

Observation:

• A 32-year-old male presented with a slow-growing right neck nodule.
• The nodule was surgically resected and pathologically examined.
• Imaging revealed a cystic lesion separate from the main thyroid gland.

Findings:

• Histopathological analysis confirmed a simple colloid cyst within a parasitic thyroid nodule.
• Simple colloid cysts result from impaired thyroglobulin accumulation in inactive thyroid follicles.
• The parasitic thyroid nodule's ectopic location was a unique feature.

Implications:

• This case expands the understanding of ectopic thyroid tissue pathologies.
• It underscores the importance of considering rare presentations in neck mass diagnosis.
• Accurate pathological diagnosis is crucial for appropriate patient management.