Johannes Nowak1,2, Karolina Nemes3, Annika Hohm1, Lindsey A Vandergrift4, Martin Hasselblatt5, Pascal D Johann6,7,8, Marcel Kool6,7, Michael C Frühwald3,9, Monika Warmuth-Metz1. 1. Reference Center for Neuroradiology, Institute for Diagnostic and Interventional Neuroradiology, University Hospital of Würzburg, Würzburg, Germany. 2. Institute for Diagnostic and Interventional Radiology, University Hospital of Würzburg, Würzburg, Germany. 3. Swabian Childrens' Cancer Center, Children's Hospital Augsburg and European-Rhabdoid (EU-RHAB) Registry, Augsburg, Germany. 4. Departments of Radiology and Pathology, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts, USA. 5. Institute of Neuropathology, University Hospital Münster, Münster, Germany. 6. Hopp-Children's Cancer Center at the National Center for Tumor Diseases Heidelberg, Heidelberg, Germany. 7. Division of Pediatric Neuro-Oncology, German Cancer Consortium, German Cancer Research Center, Heidelberg, Germany. 8. Department of Pediatric Hematology and Oncology, University Hospital Heidelberg, Heidelberg, Germany. 9. Department of Pediatric Hematology and Oncology, University Children's Hospital Münster, Münster, Germany.
Abstract
Background: Recently, 3 molecular subgroups of atypical teratoid/rhabdoid tumor (ATRT) were identified, but little is known of their clinical and magnetic resonance imaging (MRI) characteristics. Methods: A total of 43 patients with known molecular subgroup status (ATRT-sonic hedgehog [SHH], n = 17; ATRT-tyrosine [TYR], n = 16; ATRT-myelocytomatosis oncogene [MYC], n = 10) were retrieved from the EU-RHAB Registry and analyzed for clinical and MRI features. Results: On MRI review, differences in preferential tumor location were confirmed, with ATRT-TYR being predominantly located infratentorially (P < 0.05). Peritumoral edema was more pronounced in ATRT-MYC compared with ATRT-SHH (P < 0.05) and ATRT-TYR (P < 0.05). Conversely, peripheral tumor cysts were found more frequently in ATRT-SHH (71%) and ATRT-TYR (94%) compared with ATRT-MYC (40%, P < 0.05). Contrast enhancement was absent in 29% of ATRT-SHH (0% of ATRT-TYR; 10% of ATRT-MYC; P < 0.05), and there was a trend toward strong contrast enhancement in ATRT-TYR and ATRT-MYC. We found the characteristic (bandlike) enhancement in 28% of ATRT as well as restricted diffusion in the majority of tumors. A midline/off-midline location in the posterior fossa was also not subgroup specific. Visible meningeal spread (M2) at diagnosis was rare throughout all subgroups. Conclusion: These exploratory findings suggest that MRI features vary across the 3 molecular subgroups of ATRT. Within future prospective trials, MRI may aid diagnosis and treatment stratification.
Background: Recently, 3 molecular subgroups of atypical teratoid/rhabdoid tumor (ATRT) were identified, but little is known of their clinical and magnetic resonance imaging (MRI) characteristics. Methods: A total of 43 patients with known molecular subgroup status (ATRT-sonic hedgehog [SHH], n = 17; ATRT-tyrosine [TYR], n = 16; ATRT-myelocytomatosis oncogene [MYC], n = 10) were retrieved from the EU-RHAB Registry and analyzed for clinical and MRI features. Results: On MRI review, differences in preferential tumor location were confirmed, with ATRT-TYR being predominantly located infratentorially (P < 0.05). Peritumoral edema was more pronounced in ATRT-MYC compared with ATRT-SHH (P < 0.05) and ATRT-TYR (P < 0.05). Conversely, peripheral tumor cysts were found more frequently in ATRT-SHH (71%) and ATRT-TYR (94%) compared with ATRT-MYC (40%, P < 0.05). Contrast enhancement was absent in 29% of ATRT-SHH (0% of ATRT-TYR; 10% of ATRT-MYC; P < 0.05), and there was a trend toward strong contrast enhancement in ATRT-TYR and ATRT-MYC. We found the characteristic (bandlike) enhancement in 28% of ATRT as well as restricted diffusion in the majority of tumors. A midline/off-midline location in the posterior fossa was also not subgroup specific. Visible meningeal spread (M2) at diagnosis was rare throughout all subgroups. Conclusion: These exploratory findings suggest that MRI features vary across the 3 molecular subgroups of ATRT. Within future prospective trials, MRI may aid diagnosis and treatment stratification.
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