CTICasesIndolent Type A Thymoma
Imaging findings
Serial CT chest scans over multiple years show a slowly growing, well-circumscribed, homogeneous anterior mediastinal mass abutting the right atrium. MRI shows intermediate T1 and T2 signal, and pathology post-resection confirmed type A thymoma.
Key takeaways
Type A thymomas (spindle cell thymomas) are benign or low-grade neoplasms characterized by a highly indolent, slow growth pattern. They can persist for years with minimal change, mimicking nerve sheath tumors (schwannomas) or benign cysts, but complete surgical resection is diagnostic and curative.
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