Invasive thymoma: cytomorphological features on fine needle aspiration cytology.

Although thymomas are the commonest neoplasms of the anterior mediastinum, distinction between benign and malignant thymomas is controversial on Fine needle aspiration biopsy. We present cytomorphological features of a case of invasive thymoma on computed tomographic guided fine needle aspiration cytology and its basis is discussed in light of current concepts of thymic tumours.