Atypical type A thymomas exhibit more aggressive features than conventional type A thymomas. Type AB thymomas rarely have atypical type A components. We report a rare case of type AB thymoma with an atypical type A component. that was identified after pulmonary metastasectomy 11 years after the primary surgery and long-term follow-up after recurrence. https://www.klinikasmaulhusna.com/product-category/sheaths-sleeves/