# The Reversed Halo Sign: A Rare Presentation of Legionella Pneumonia

**Authors:** Alexandre Dias Mançano, Gláucia Zanetti, Edson Marchiori

PMC · DOI: 10.1590/0037-8682-0565-2025 · Revista da Sociedade Brasileira de Medicina Tropical · 2026-02-16

## Full-text entities

- **Diseases:** fever (MESH:D005334), L. pneumophila pneumonia (MESH:D011014), diarrhea (MESH:D003967), Pleural effusion (MESH:D010996), lymphadenopathy (MESH:D008206), hyponatremia (MESH:D007010), pain (MESH:D010146), cryptogenic organizing pneumonia (MESH:D018549), diseases (MESH:D004194), respiratory infections (MESH:D012141), RHS (MESH:C000721353), infectious (MESH:D003141), myalgia (MESH:D063806), crackles (MESH:D012135), dry cough (MESH:D003371), leukocytosis (MESH:D007964), chills (MESH:D023341)
- **Chemicals:** oxygen (MESH:D010100), Azithromycin (MESH:D017963)
- **Species:** Human immunodeficiency virus 1 (no rank) [taxon 11676], Legionella pneumophila (species) [taxon 446], Homo sapiens (human, species) [taxon 9606], Human immunodeficiency virus (species) [taxon 12721]

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## References

5 references — full list in the complete paper: https://tomesphere.com/paper/PMC12922512/full.md

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Source: https://tomesphere.com/paper/PMC12922512