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[Differential diagnosis of children's enlarged necks--cervical thymic cysts]
H Riechelmann1, M Wolfensberger, W Coerdt
1Universitäts-HNO-Klinik Mainz.
Insights
This case report details a rare cervical thymic cyst in an 11-year-old boy. Early recognition and surgical considerations are crucial for this unusual neck mass.
Area of Science:
- Pediatric Surgery
- Head and Neck Pathology
- Developmental Biology
Background:
- Cervical thymic cysts are rare congenital anomalies.
- They can present as neck masses, often mimicking other pathologies.
Observation:
- An 11-year-old boy presented with a large, infrahyoid cystic mass.
- Imaging revealed displacement of major neck vessels and an atypical density.
- Surgical dissection required careful management of the vagus nerve and vascular structures.
Findings:
- Histopathology confirmed a thymic cyst with Hassall's bodies and cholesterol crystals.
- The cyst was distinct from branchial cleft anomalies and had no pharyngeal connection.
- Postoperative recovery was uneventful, with no signs of immune deficiency.
Implications:
- Cervical thymic cysts require differentiation from other neck masses, particularly second branchial cleft cysts.
- Preoperative imaging is vital for surgical planning due to potential vascular and neural involvement.
- Surgical complexity necessitates awareness of anatomical relationships and potential complications.
Abstract:
We present a cervical thymic cyst in an otherwise healthy 11 year old boy. Ultrasonography revealed a smooth, medium echogenic cystic mass of 62 x 28 x 12 mm with weak acoustic enhancement lying between the carotid artery and the internal jugular vein. The mass extended from the hyoid bone to the inferior pole of the thyroid gland. CT scans also revealed the displacement of the carotid artery and the internal jugular vein by an atypically dense cystic mass. At operation the vagus nerve had to be dissected from the posterior wall of the cyst. A solid band of fibrous tissue extended to the inferior pole of the thyroid gland; there was no connection to the pharyngeal wall. On histological examination Hassal's bodies, cholesterol crystals and a mild round-cell infiltration were observed. The postoperative course was normal. There were no immune defects or signs of lymphogranulomatous disease. Cervical thymic cysts may be recognised before operation and differentiated from second arch cysts by their atypically low infrahyoid position, their intimate relation to the vessels of the neck and their extension into the upper mediastinum. Surgery can be difficult due to the intimate relation to the vessels of the neck and the vagus nerve, and to extension into the upper mediastinum.