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Chest
Differential Diagnosis
Lungs and Airspaces
Modality-Specific Imaging Findings: Computed Tomography
CT Halo Sign
CT Halo Sign
Santiago Martínez-Jiménez, MD
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DIFFERENTIAL DIAGNOSIS

    ESSENTIAL INFORMATION

    • Key Differential Diagnosis Issues

      • Helpful Clues for Common Diagnoses

        • Helpful Clues for Less Common Diagnoses

          • Helpful Clues for Rare Diagnoses

            Selected References

            1. Alves Júnior SF et al: CT halo sign in pulmonary metastases from a melanoma. QJM. 112(2):133-4, 2019
            2. Tian HW et al: Multiple pulmonary metastases with halo-sign from malignant mixed müllerian tumors. Oncol Lett. 14(6):6645-9, 2017
            3. Nagayoshi Y et al: An autopsy case of lepidic pulmonary metastasis from cholangiocarcinoma. Intern Med. 55(19):2849-53, 2016
            4. Holwerda RA et al: Thoracic metastases from primary hepatobiliary and pancreatic malignancies: predictable patterns of metastatic spread. J Thorac Imaging. 30(6):W82-91, 2015
            5. Martínez-Jiménez S et al: Imaging features of thoracic metastases from gynecologic neoplasms. Radiographics. 34(6):1742-54, 2014
            6. Rousset P et al: Thoracic endometriosis syndrome: CT and MRI features. Clin Radiol. 69(3):323-30, 2014
            7. Walker CM et al: Imaging pulmonary infection: classic signs and patterns. AJR Am J Roentgenol. 202(3):479-92, 2014
            8. Algın O et al: Signs in chest imaging. Diagn Interv Radiol. 17(1):18-29, 2011
            9. Hochhegger B et al: Psittacosis presenting as a halo sign on high-resolution computed tomography. J Thorac Imaging. 24(2):136-7, 2009
            10. Kaewlai R et al: Multidetector CT of blunt thoracic trauma. Radiographics. 28(6):1555-70, 2008
            11. Godoy MC et al: Imaging features of pulmonary Kaposi sarcoma-associated immune reconstitution syndrome. AJR Am J Roentgenol. 189(4):956-65, 2007
            12. Marshall GB et al: Signs in thoracic imaging. J Thorac Imaging. 21(1):76-90, 2006
            13. Lee YR, et al. CT halo sign: the spectrum of pulmonary diseases. Br J Radiol. 2005 Sep;78(933):862-5.
            14. Pinto PS: The CT Halo Sign. Radiology. 230(1):109-10, 2004
            15. Franquet T et al: Spectrum of pulmonary aspergillosis: histologic, clinical, and radiologic findings. Radiographics. 21(4):825-37, 2001
            16. Seo JB et al: Atypical pulmonary metastases: spectrum of radiologic findings. Radiographics. 21(2):403-17, 2001
            17. Kim Y et al: Halo sign on high resolution CT: findings in spectrum of pulmonary diseases with pathologic correlation. J Comput Assist Tomogr. 23(4):622-6, 1999
            18. Primack SL et al: Pulmonary nodules and the CT halo sign. Radiology. 190(2):513-5, 1994
            Related Anatomy
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            Related Differential Diagnoses
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            References
            Tables

            Tables

            DIFFERENTIAL DIAGNOSIS

              ESSENTIAL INFORMATION

              • Key Differential Diagnosis Issues

                • Helpful Clues for Common Diagnoses

                  • Helpful Clues for Less Common Diagnoses

                    • Helpful Clues for Rare Diagnoses

                      Selected References

                      1. Alves Júnior SF et al: CT halo sign in pulmonary metastases from a melanoma. QJM. 112(2):133-4, 2019
                      2. Tian HW et al: Multiple pulmonary metastases with halo-sign from malignant mixed müllerian tumors. Oncol Lett. 14(6):6645-9, 2017
                      3. Nagayoshi Y et al: An autopsy case of lepidic pulmonary metastasis from cholangiocarcinoma. Intern Med. 55(19):2849-53, 2016
                      4. Holwerda RA et al: Thoracic metastases from primary hepatobiliary and pancreatic malignancies: predictable patterns of metastatic spread. J Thorac Imaging. 30(6):W82-91, 2015
                      5. Martínez-Jiménez S et al: Imaging features of thoracic metastases from gynecologic neoplasms. Radiographics. 34(6):1742-54, 2014
                      6. Rousset P et al: Thoracic endometriosis syndrome: CT and MRI features. Clin Radiol. 69(3):323-30, 2014
                      7. Walker CM et al: Imaging pulmonary infection: classic signs and patterns. AJR Am J Roentgenol. 202(3):479-92, 2014
                      8. Algın O et al: Signs in chest imaging. Diagn Interv Radiol. 17(1):18-29, 2011
                      9. Hochhegger B et al: Psittacosis presenting as a halo sign on high-resolution computed tomography. J Thorac Imaging. 24(2):136-7, 2009
                      10. Kaewlai R et al: Multidetector CT of blunt thoracic trauma. Radiographics. 28(6):1555-70, 2008
                      11. Godoy MC et al: Imaging features of pulmonary Kaposi sarcoma-associated immune reconstitution syndrome. AJR Am J Roentgenol. 189(4):956-65, 2007
                      12. Marshall GB et al: Signs in thoracic imaging. J Thorac Imaging. 21(1):76-90, 2006
                      13. Lee YR, et al. CT halo sign: the spectrum of pulmonary diseases. Br J Radiol. 2005 Sep;78(933):862-5.
                      14. Pinto PS: The CT Halo Sign. Radiology. 230(1):109-10, 2004
                      15. Franquet T et al: Spectrum of pulmonary aspergillosis: histologic, clinical, and radiologic findings. Radiographics. 21(4):825-37, 2001
                      16. Seo JB et al: Atypical pulmonary metastases: spectrum of radiologic findings. Radiographics. 21(2):403-17, 2001
                      17. Kim Y et al: Halo sign on high resolution CT: findings in spectrum of pulmonary diseases with pathologic correlation. J Comput Assist Tomogr. 23(4):622-6, 1999
                      18. Primack SL et al: Pulmonary nodules and the CT halo sign. Radiology. 190(2):513-5, 1994