Erdheim-Chester disease (ECD) is a rare non-Langerhans cell histiocytosis. Erdheim-Chester disease is considered a potentially severe multisystemic disease with life-threatening manifestations due to the compression of normal structures. Recently, mutation of the proto-oncogene BRAF (BRAFV600E) has been found in 100% of cases. The common sites of involvement are the skeleton, central nervous system, cardiovascular system, lungs, retroperitoneum, and skin.We present the autopsy case of a 48-year-old White woman with an unknown tumor of the heart, where finally autopsy revealed the diagnosis of ECD. The clinical, radiological, and pathological manifestations associated with ECD are highlighted.