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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.
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The thymus is a primary lymphoid organ situated in the superior mediastinum. Largest during early life, the thymus gradually decreases in size after puberty and undergoes fibrofatty replacement, accompanied by diminished immunologic function.[1] Clinical relevance persists due to the organ’s proximity to major mediastinal structures and its association with pathological conditions such as myasthenia gravis and DiGeorge syndrome.[2] Familiarity with thymic anatomy and function is essential for recognizing mediastinal masses, interpreting imaging studies, and diagnosing immunologic disorders and paraneoplastic syndromes linked to pathologies affecting this organ. Additionally, knowledge of the thymus supports safe surgical planning in the anterior mediastinum, particularly during thymectomy or cardiac procedures.