Thymic cysts are rarely associated with myasthenia gravis. There is a significant and yet incompletely understood association with Hodgkin s lymphoma either at initial presentation or following treatment during disease recurrence. The cystic nature of the lesion can be demonstrated either on ultrasonography or more conclusively on CT scans. Arcuate or rim calcification which occurs rarely in thymic cysts can be best demonstrated by CT scan. The diagnosis of the cystic neoplasms has to be considered in the presence of solid component within the cyst and systemic symptoms in the patient.
Biopsy is essential to establish definite diagnosis.