Fig. 9
From: Neoplastic pathology at the crossroads between neck imaging and cardiothoracic imaging
Schwannoma. a Sagital T2WI MR image demonstrates a well-circumscribed heterogeneous, predominantly hyperintense lesion arising from a right upper thoracic neural foramen. The lesion has multiple internal low-intensity ring-like structures (arrow), called the fascicular sign (representing fascicular bundles within the nerve). b Axial T1WI MR post contrast image of the thoracic spine in a companion case demonstrates heterogeneous enhancement of the lesion arising from the left T2 neuroforamina (arrow)