Ectopic Cervical Thymus in Adult: An Incidental Finding

Area of Science:

• Embryology
• Anatomic Pathology
• Surgical Pathology

Background:

• The thymus, a primary lymphoid organ, typically resides in the mediastinum.
• Ectopic locations, including the neck, can occur due to developmental anomalies.
• Ectopic Cervical Thymus (ECT) is exceptionally rare in adults and may present as a mass, cyst, or thymoma.

Purpose of the Study:

• To report a rare case of Ectopic Cervical Thymus (ECT) incidentally found in an adult.
• To discuss the diagnostic implications of ECT, which can mimic other neck pathologies.
• To illustrate the utility of immunohistochemistry in identifying thymic tissue.

Main Methods:

• Case report of incidental ECT discovery during thyroid carcinoma histopathological examination.
• Review of relevant embryological development and anatomical variations of the thymus.
• Application of immunohistochemistry markers to confirm thymic components.

Main Results:

• An adult patient presented with an incidentally discovered Ectopic Cervical Thymus.
• The ECT mimicked other pathological masses, highlighting potential diagnostic confusion.
• Immunohistochemistry confirmed the presence of thymic tissue and its components.

Conclusions:

• Ectopic Cervical Thymus is a rare differential diagnosis for neck masses in adults.
• Incidental findings require careful histopathological evaluation and immunohistochemical confirmation.
• Understanding thymic embryology and ectopic presentations is crucial for accurate diagnosis.