I cannot create a summary of this article because the search results provided do not include the content of the article "Case 6-2026: A 91-Year-Old Man with Shortness of Breath, Weight Loss, and Eosinophilia" from the New England Journal of Medicine. The search results only contain links to other articles and documents that are not related to this case. In order to create an accurate and factual summary as per your requirements, I would need access to the full text of this particular article.