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Understanding a Hard Lump Under the Sternum: Clinical Perspectives for 2026

"Discovering a hard lump located under or near the sternum (the breastbone) often triggers immediate health anxiety. In medical terminology, this area is referred to as the substernal or parasternal region. While the primary search intent behind this query is typically diagnostic—seeking to distinguish between benign structural anomalies and potential malignancies—it is imperative to approach this from a clinical perspective. This article provides an overview of anatomical causes, differential diagnoses, and the standard of care for 2026. Anatomical and Pathological Foundations of Substernal Masses The sternum protects vital structures, includ..."

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