Volume 25, Issue 5 pp. 785-791
Clinical Investigative Study

Pediatric Cerebellar Tumors: Does ADC Analysis of Solid, Contrast-Enhancing Tumor Components Correlate Better with Tumor Grade than ADC Analysis of the Entire Tumor?

Gunes Orman MD

Gunes Orman MD

Section of Pediatric Neuroradiology, Division of Pediatric Radiology, Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD

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Thangamadhan Bosemani MD

Thangamadhan Bosemani MD

Section of Pediatric Neuroradiology, Division of Pediatric Radiology, Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD

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Luke Higgins MD, PhD

Luke Higgins MD, PhD

Section of Pediatric Neuroradiology, Division of Pediatric Radiology, Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD

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Kathryn A. Carson ScM

Kathryn A. Carson ScM

Department of Epidemiology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, MD

Division of General Internal Medicine, Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD

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Thierry A.G.M. Huisman MD

Thierry A.G.M. Huisman MD

Section of Pediatric Neuroradiology, Division of Pediatric Radiology, Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD

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Andrea Poretti MD

Corresponding Author

Andrea Poretti MD

Section of Pediatric Neuroradiology, Division of Pediatric Radiology, Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD

Correspondence: Address correspondence to Andrea Poretti, MD, Section of Pediatric Neuroradiology, Division of Pediatric Radiology, Russell H. Morgan Department of Radiology and Radiological Science, Charlotte R. Bloomberg Children's Center, Sheikh Zayed Tower, Room 4174, 1800 Orleans Street, Baltimore, MD 21287-0842, USA. E-mail: [email protected].Search for more papers by this author
First published: 16 December 2014
Citations: 9

Conflict of Interest: The authors declare that they have no conflict of interest.

ABSTRACT

BACKGROUND

Apparent diffusion coefficient (ADC) values assist differentiating malignancy grades in pediatric cerebellar tumors. Previous studies reported the significance of ADC measurements within the solid, contrast-enhancing tumor component (SCT). These measurements take into account only a part of the tumor. In this study, we compared ADC measurements of the SCT versus entire tumor (ET).

METHODS

ADC values were measured in the SCT and ET. Absolute tumor ADC values and cerebellar and thalamic ratios were compared across tumor grades.

RESULTS

Thirty-two children with 16 low-grade and 16 high-grade tumors were included. The median age at presurgical MRI was 7.66 years (range .08-17.38 years). In the SCT, absolute ADC values, cerebellar ratio, and thalamic ratio were higher in low- versus high-grade tumors (P < .001). In the ET, absolute ADC values, cerebellar ratio, and thalamic ratio were also higher in low- versus high-grade tumors (P < .005). Cut-off absolute ADC values of .9 × 10−3 mm/s2 (sensitivity 94%, specificity 100%) and 1.5 × 10−3 mm/s2 (sensitivity 88%, specificity 75%) were calculated for measurement in the SCT and ET, respectively, to differentiate between tumors grades.

CONCLUSION

A rigorous ADC measurement of the SCT has a higher sensitivity and specificity in predicting tumor grade compared to ADC measurement of the ET.

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