Diffusion-weighted imaging (DWI) of adenomyosis and fibroids of the uterus

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This study found statistically significant differences in apparent diffusion coefficient (ADC) values between uterine fibroids and adenomyosis, suggesting ADC measurements can differentiate these pathologies.

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This retrospective study compared diffusion-weighted MRI apparent diffusion coefficient (ADC) values between uterine fibroids and adenomyosis in 50 patients who underwent pelvic MR imaging, using b factors of 50, 400, and 800 s/mm on a 1.5 T scanner. ADC regions of interest were measured in fibroid tissue, adenomyosis areas, normal myometrium, skeletal muscle, and urine, and histogram analysis in subsets (20 cases each) assessed tissue heterogeneity. Adenomyosis and fibroids showed statistically significant ADC differences versus normal myometrium and versus each other (adenomyosis mean 0.86 ± 0.30 vs fibroids 0.64 ± 0.29 × 10−3 mm2/s), and histogram analysis indicated less heterogeneity in adenomyosis than in fibroids, with the main caveat being that ADC differentiation was studied retrospectively without explicit histopathologic confirmation details in the abstract. This paper is centrally about endometriosis and/or adenomyosis — specifically adenomyosis imaging differentiation from fibroids using quantitative DWI/ADC measurements.

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Abstract

PurposeAlthough magnetic resonance imaging is often able to distinguish between adenomyosis and fibroids, occasionally the imaging features of focal adenomyosis and fibroids overlap. Diffusion-weighted imaging (DWI) may provide useful information in differentiating pathologies. Therefore, the purpose of our study was to evaluate differences, if any, in the apparent diffusion coefficient (ADC) values of fibroids and adenomyosis.Material and methodsPatients (n = 50) with uterine fibroids and adenomyosis (n = 43), who underwent pelvic MR imaging including DWI, were included in this IRB approved HIPPA compliant retrospective study. DWI was performed with b factors of 50, 400, and 800 s/mm using a 1.5 T scanner. ADC ROI measurements were placed over a fibroid, an area of adenomyosis, unaffected normal myometrium, skeletal muscle, and urine. Histogram analysis of ADC maps in 20 cases each of adenomyosis and fibroids was evaluated to assess the degree of tissue heterogeneity.ResultsThe ADC values of adenomyosis and fibroids were compared using Student's t test. The mean and the standard deviation of the ADC values of the control group were as follows: fibroid 0.64 ± 0.29, adenomyosis 0.86 ± 0.30, myometrium 1.39 ± 0.36, and urine 3.01 ± 0.2 × 10(-3) mm(2)/s. There was a statistically significant difference among the ADC values of normal myometrium and fibroids (p < 0.0001), normal myometrium and adenomyosis (p < 0.0001), and fibroids and adenomyosis (p < 0.001). Histogram analysis demonstrates less heterogeneity of adenomyosis as compared to fibroids.ConclusionThe present study shows that ADC measurements have the potential to quantitatively differentiate between fibroids and adenomyosis.
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Abstract

Purpose Although magnetic resonance imaging is often able to distinguish between adenomyosis and fibroids, occasionally the imaging features of focal adenomyosis and fibroids overlap. Diffusion-weighted imaging (DWI) may provide useful information in differentiating pathologies. Therefore, the purpose of our study was to evaluate differences, if any, in the apparent diffusion coefficient (ADC) values of fibroids and adenomyosis.

Material and methods

Patients (n = 50) with uterine fibroids and adenomyosis (n = 43), who underwent pelvic MR imaging including DWI, were included in this IRB approved HIPPA compliant retrospective study. DWI was performed with b factors of 50, 400, and 800 s/mm using a 1.5 T scanner. ADC ROI measurements were placed over a fibroid, an area of adenomyosis, unaffected normal myometrium, skeletal muscle, and urine. Histogram analysis of ADC maps in 20 cases each of adenomyosis and fibroids was evaluated to assess the degree of tissue heterogeneity.

Results

The ADC values of adenomyosis and fibroids were compared using Student’s t test. The mean and the standard deviation of the ADC values of the control group were as follows: fibroid 0.64 ± 0.29, adenomyosis 0.86 ± 0.30, myometrium 1.39 ± 0.36, and urine 3.01 ± 0.2 × 10−3 mm2/s. There was a statistically significant difference among the ADC values of normal myometrium and fibroids (p < 0.0001), normal myometrium and adenomyosis (p < 0.0001), and fibroids and adenomyosis (p < 0.001). Histogram analysis demonstrates less heterogeneity of adenomyosis as compared to fibroids.

Conclusion

The present study shows that ADC measurements have the potential to quantitatively differentiate between fibroids and adenomyosis. Similar content being viewed by others

References

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Radiology 158:385–391 Disclosure The authors have nothing to disclose Author information Authors and Affiliations Corresponding author Rights and permissions About this article Cite this article Jha, R.C., Zanello, P.A., Ascher, S.M. et al. Diffusion-weighted imaging (DWI) of adenomyosis and fibroids of the uterus. Abdom Imaging 39, 562–569 (2014). https://doi.org/10.1007/s00261-014-0095-z Published: Issue date: DOI: https://doi.org/10.1007/s00261-014-0095-z

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Condition tags

adenomyosis

MeSH descriptors

Adenomyosis Diffusion Magnetic Resonance Imaging Leiomyoma Myometrium Uterine Neoplasms Uterus Adenomyosis Adult Diagnosis, Differential Diffusion Magnetic Resonance Imaging Female Humans Leiomyoma Myometrium Phantoms, Imaging Reproducibility of Results Retrospective Studies Uterine Neoplasms Uterus

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