T2W MRI sagittal image showing anterior sacral meningocele (8.1 × 8.1 × 8.2 cm) and underlying teratoma (19 mm). The latter was T1W-hyperintense, and T2W-and STIR-hypointense, showing no contrast-enhancing

T2W MRI sagittal image showing anterior sacral meningocele (8.1 × 8.1 × 8.2 cm) and underlying teratoma (19 mm). The latter was T1W-hyperintense, and T2W-and STIR-hypointense, showing no contrast-enhancing

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Background Juvenile idiopathic inflammatory myopathies (JIIMs) are a group of heterogenous, acquired, autoimmune disorders that affect the muscle. While the association between IIMs and malignancy has been widely reported in adults, cancer-associated myositis (CAM) is rare in children, so that routine malignancy screening is not generally performed...

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... Muscle biopsy showed endomysial and perimysial necrosis and infiltration of mononuclear cells (CD4+ and CD8+ Tcells and NK cells) ( Fig. 1) ruling out a mitochondrial myopathy. Evaluation of MAA revealed anti-TIF1-γ and anti-PM/Scl100 antibodies positivity. A Whole-body MRI showed a 19 mm-wide mass underneath the previously documented meningocele (Fig. 2). After surgical removal of both the meningocele and the mass, the latter was histologically characterized as a mature ...