Pulmonary tuberculosis associated with the reversed halo sign on high-resolution CT |
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| Authors: | E Marchiori R D Grando C E Sim?es Dos Santos L Maffazzioli Santos Balzan G Zanetti C M Mano R S Gutierrez |
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| Institution: | 1.Fluminense Federal University, Rio de Janeiro, Brazil;2.Hospital Conceição, Porto Alegre, Rio Grande do Sul, Brazil;3.Petropolis Faculty of Medicine, Rio de Janeiro, Brazil |
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| Abstract: | We describe the case of a 32-year-old woman with pulmonary tuberculosis in whom a high-resolution CT scan demonstrated the reversed halo sign. The diagnosis of tuberculosis was made by lung biopsy and the detection of acid-fast bacilli in the sputum smear and culture. Follow-up assessment revealed a significant improvement in the lesions.The reversed halo sign is observed on high-resolution CT (HRCT) as a focal round area of ground-glass attenuation surrounded by a crescent or ring of consolidation 1, 2]. It was first described as being relatively specific for cryptogenic organising pneumonia 1], but was later observed in several other infectious 3–5] and non-infectious 6, 7] diseases.We report a case of a 32-year-old patient with tuberculosis who exhibited the reversed halo sign on chest CT. To our knowledge, this sign has not been previously described in an adult with pulmonary tuberculosis. |
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