Figure 11d. Neurilemoma in a 35-year-old man with a palpable soft-tissue mass. (a) Coronal T1-weighted (500/20) MR image shows an elongated, low-signal-intensity mass (arrowheads). (b) On the axial T2-weighted (2,000/90) MR image, the mass has peripheral high signal intensity (white arrow) with low signal intensity centrally (black arrow), representing the target sign. No entering or exiting nerve is seen because the affected nerve is a small gastrocnemius intramuscular branch. (c, d) Photograph of the sectioned gross specimen (c) and photomicrograph (original magnification, x75; hematoxylin-eosin stain) (d) show corresponding more cellular Antoni A regions centrally (black *) and more myxoid Antoni B areas peripherally (white *) as well as a capsule (arrow in d).