Brazilian Journal of Pulmonology

ISSN (on-line): 1806-3756 | ISSN (printed): 1806-3713

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Thoracic calcifications on magnetic resonance imaging: correlations with computed tomography

Calcificações torácicas na ressonância magnética: correlações com a tomografia computadorizada

Juliana Fischman Zampieri1,a, Gabriel Sartori Pacini1,b, Matheus Zanon1,c, Stephan Philip Leonhardt Altmayer1,2,d, Guilherme Watte1,2,e, Marcelo Barros1,2,f Evandra Durayski2,g, Gustavo de Souza Portes Meirelles3,h, Marcos Duarte Guimarães4,5,i, Edson Marchiori6,j, Arthur Soares Souza Junior7,k, Bruno Hochhegger1,2,l

J Bras Pneumol.2019;45(4):e20180168-e20180168

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Objective: To identify the characteristics of thoracic calcifications on magnetic resonance (MR) imaging, as well as correlations between MR imaging and CT findings. Methods: This was a retrospective study including data on 62 patients undergoing CT scans and MR imaging of the chest at any of seven hospitals in the Brazilian states of Rio Grande do Sul, São Paulo, and Rio de Janeiro between March of 2014 and June of 2016 and presenting with calcifications on CT scans. T1- and T2-weighted MR images (T1- and T2-WIs) were semiquantitatively analyzed, and the lesion-to-muscle signal intensity ratio (LMSIR) was estimated. Differences between neoplastic and non-neoplastic lesions were analyzed. Results: Eighty-four calcified lesions were analyzed. Mean lesion density on CT was 367 ± 435 HU. Median LMSIRs on T1- and T2-WIs were 0.4 (interquartile range [IQR], 0.1-0.7) and 0.2 (IQR, 0.0-0.7), respectively. Most of the lesions were hypointense on T1- and T2-WIs (n = 52 [61.9%] and n = 39 [46.4%], respectively). In addition, 19 (22.6%) were undetectable on T1-WIs (LMSIR = 0) and 36 (42.9%) were undetectable on T2-WIs (LMSIR = 0). Finally, 15.5% were hyperintense on T1-WIs and 9.5% were hyperintense on T2-WIs. Median LMSIR was significantly higher for neoplastic lesions than for non-neoplastic lesions. There was a very weak and statistically insignificant negative correlation between lesion density on CT and the following variables: signal intensity on T1-WIs, LMSIR on T1-WIs, and signal intensity on T2-WIs (r = −0.13, p = 0.24; r = −0.18, p = 0.10; and r = −0.16, p = 0.16, respectively). Lesion density on CT was weakly but significantly correlated with LMSIR on T2-WIs (r = −0.29, p < 0.05). Conclusions: Thoracic calcifications have variable signal intensity on T1- and T2-weighted MR images, sometimes appearing hyperintense. Lesion density on CT appears to correlate negatively with lesion signal intensity on MR images.

 


Keywords: Calcification, physiologic; Thorax/diagnostic imaging; Tomography, X-ray computed; Magnetic resonance imaging.

 


When is the use of contrast media in chest CT indicated?

Quando é indicado o uso de meios de contraste na TC de tórax?

Bruno Hochhegger1,2,3, Robson Rottenfusser4,5, Edson Marchiori6

J Bras Pneumol.2017;43(5):400-400

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