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Fig. 3A —MRI features of arrested pneumatization in 30-year-old woman
imaged for follow-up of oligodendroglioma (not shown) and seizures. Axial T1
image (TR/TE, 550/14; number of excitations [NEX], 1) shows circumscribed
region of increased T1 signal involving left basisphenoid (arrow)
adjacent to sphenoid sinus (S). Findings suggest fat occurring in association
with arrested pneumatization. Note that T1 signal of lesion exceeds T1 signal
in adjacent clivus (asterisk).
