Fig. 2

Imaging results in cases with NFPMA(A-D) and SSM(E-F). Trans-axial and sagittal contrast MRI images (a, b) showed the tumor (white arrows) had obvious enhancement. The pituitary gland was under the tumor intactly (white arrowheads) and the tumor was misdiagnosed as a pituitary macroadenoma on MRI images. Slight uptake of ¹⁸F-FDG (c) and high uptake of ¹³N-ammonia (d) on PET images. Trans-axial and coronal contrast MRI images (e, f) showed a marked enhancement (white arrows) mass mostly in the suprasellar region. The mass grew into the pituitary fossa and the pituitary gland was compressed. The lesion displayed obviously higher uptake of ¹³N-ammonia (h) compared with normal gray matter and low uptake of ¹⁸F-FDG (g)