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Bone marrow magnetic resonance imaging: physiologic and pathologic findings that radiologist should know

  • DIAGNOSTIC IMAGING IN ONCOLOGY
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Abstract

Magnetic resonance imaging (MRI) plays a leading role in the non-invasive evaluation of bone marrow (BM). Normal BM pattern depends on the ratio and distribution of yellow and red marrow, which are subject to changes with age, pathologies, and treatments. Neonates show almost entirely red marrow. Over time, yellow marrow conversion takes place with a characteristic sequence leading to a red marrow persistence in proximal metaphyses of long bones. In adults, normal BM is composed of both red (40% water, 40% fat) and yellow marrow (15% water, 80% fat). Due to the higher content of fat, yellow marrow normally appears hyperintense on T1-weighted (T1w) fast spin echo (FSE) sequences and hypo-/iso-intense in short tau inversion recovery (STIR) T2-weighted (T2w); red marrow appears slightly hyperintense in T1w FSE and hyper-/iso-intense in STIR T2w. Pathologic BM has reduced fat and increased water percentages, resulting hypointense in T1w FSE and hyperintense in STIR T2w. In oncologic patients, BM MRI signal largely depends on the treatment (irradiation and/or chemotherapy) and its timing. BM fat and water amount and location in normal red/yellow and pathologic marrow are responsible for different signals in MRI sequences whose knowledge by radiologists may help to differentiate between normal and pathologic findings. Our aim was to discuss and illustrate the MRI of BM physiologic conversion and pathologic reconversion occurring in malignancies and after treatments in cancer patients.

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Acknowledgements

Pictures have been developed with the collaboration of Simone Caposano.

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All authors were involved in patient management and wrote and/or reviewed the report. The electronic poster entitled “C-2445—Bone Marrow: is it normal? Physiologic and pathologic Magnetic Resonance Imaging (MRI) findings” has been presented in the Electronic Poster Online System (EPOS™) of the European Society of Radiology and within the scientific and educational programme at the European Congress of Radiology 2019, held on 27 February–3 March 2019, in Vienna, Austria. The poster is available at epos.myESR.org and can be cited through its unique https://doi.org/10.26044/ecr2019/c-2445.

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Correspondence to Maria Grazia Chiarilli.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Chiarilli, M.G., Delli Pizzi, A., Mastrodicasa, D. et al. Bone marrow magnetic resonance imaging: physiologic and pathologic findings that radiologist should know. Radiol med 126, 264–276 (2021). https://doi.org/10.1007/s11547-020-01239-2

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