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Thymic cysts occur relatively rarely and account for only about 3% of all anterior mediastinal masses.1 Although thymic cysts usually grow very slowly, there have been three reported cases of unilocular thymic cysts that enlarged rapidly as a result of intracystic haemorrhage: two cases occurred in children with aplastic anaemia and one occurred in a 13 year old boy with no other symptoms.2,3 Here, we present a case of a unilocular thymic cyst, which appeared within one year, was associated with chronic inflammation, and had findings different from the cases reported previously.
The patient was a 63 year old man, who had been well with no apparent symptoms of disease. There was no history of trauma. He complained of dull anterior chest pain in April 2001, and a chest x ray film showed an abnormal shadow in the left mediastinum. A chest x ray that had been taken one year before for a routine medical examination had …