N Domínguez-Pinilla1, A Martínez de Aragón2, S Diéguez Tapias2, O Toldos3, J Hinojosa Bernal4, M Rigal Andrés5, L I González-Granado6. 1. Unidad de Hemato-Oncología Pediátrica, Hospital 12 de Octubre, Madrid, España. Electronic address: nere.mdc@gmail.com. 2. Unidad de Radiología Pediátrica, Hospital 12 de Octubre, Madrid, España. 3. Unidad de Anatomía Patológica, Hospital 12 de Octubre, Madrid, España. 4. Unidad de Neurocirugía Pediátrica, Hospital 12 de Octubre, Madrid, España. 5. Unidad de Hemato-Oncología Pediátrica, Hospital 12 de Octubre, Madrid, España. 6. Unidad de Hemato-Oncología Pediátrica, Unidad de Inmunodeficiencias Pediátricas, Hospital 12 de Octubre, Madrid, España.
Abstract
BACKGROUND: The apparent diffusion coefficient (ADC) in MRI seems to be related to cellularity in brain tumours. Its utility as a tool for distinguishing between histological types and tumour stages remains controversial. PROCEDURES: We retrospectively evaluated children diagnosed with CNS tumours between January 2008 and December 2013. Data collected were age, sex, histological diagnosis, and location of the tumour. We evaluated the ADC and ADC ratio and correlated those values with histological diagnoses. RESULTS: The study included 55 patients with a median age of 6 years. Histological diagnoses were pilocytic astrocytoma (40%), anaplastic ependymoma (16.4%), ganglioglioma (10.9%), glioblastoma (7.3%), medulloblastoma (5.5%), and other (20%). Tumours could also be classified as low-grade (64%) or high-grade (36%). Mean ADC was 1.3 for low-grade tumours and 0.9 for high-grade tumours (p=.004). Mean ADC ratios were 1.5 and 1.2 for low and high-grade tumours respectively (p=.025). There were no significant differences in ADC/ADC ratio between different histological types. CONCLUSION: ADC and ADC ratio may be useful in imaging-study based differential diagnosis of low and high-grade tumours, but they are not a substitute for an anatomical pathology study.
BACKGROUND: The apparent diffusion coefficient (ADC) in MRI seems to be related to cellularity in brain tumours. Its utility as a tool for distinguishing between histological types and tumour stages remains controversial. PROCEDURES: We retrospectively evaluated children diagnosed with CNS tumours between January 2008 and December 2013. Data collected were age, sex, histological diagnosis, and location of the tumour. We evaluated the ADC and ADC ratio and correlated those values with histological diagnoses. RESULTS: The study included 55 patients with a median age of 6 years. Histological diagnoses were pilocytic astrocytoma (40%), anaplastic ependymoma (16.4%), ganglioglioma (10.9%), glioblastoma (7.3%), medulloblastoma (5.5%), and other (20%). Tumours could also be classified as low-grade (64%) or high-grade (36%). Mean ADC was 1.3 for low-grade tumours and 0.9 for high-grade tumours (p=.004). Mean ADC ratios were 1.5 and 1.2 for low and high-grade tumours respectively (p=.025). There were no significant differences in ADC/ADC ratio between different histological types. CONCLUSION: ADC and ADC ratio may be useful in imaging-study based differential diagnosis of low and high-grade tumours, but they are not a substitute for an anatomical pathology study.
Authors: Alexander Rau; Elias Kellner; Niels A Foit; Niklas Lützen; Dieter H Heiland; Andreas Schulze-Bonhage; Marco Reisert; Valerij G Kiselev; Marco Prinz; Horst Urbach; Irina Mader Journal: Neuroradiol J Date: 2018-11-21