The wall of the<unk>  can have multiple array of pathology. It may have single layered squamous cell to multiple layers of stratified cells. Sometimes the sample includes thyroid or parathyroid tissue. This is thought to be due to the common embryologic origin of thymus and thyroid and parathyroid cells. The<unk>  itself contains brown colored fluid.
Cervical thymic cyst
Cervical lymphadenopathy
Thoracic endometriosis
Ectopic thymus
Laryngeal cyst
Inguinal lymphadenopathy
Mycobacterial cervical lymphadenitis
ALPSA lesion