Avoiding invasive surgical procedures for a slow-growing asymptomatic huge anterior mediastinal lipoma under watchful waiting.

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A mass shadow in the right lower lung field was detected by chest X‐ray in a 79‐year‐old woman, which was eventually diagnosed as anterior mediastinal lipoma. She remained under watchful waiting without surgery for 9 years without developing symptoms, even though the lipoma had grown to an extremely large size.