Meningeal infiltration
Figure 1: Meningeal infiltration. The dura mater continues as the perineurium. In general the tumor cells do not spread beyond this boundary centrifugally. (A) tumour spread in the subarachnoid space. (B) Lumps and nodules consist of tumour cells and have their own vascularisation. RM: spinal cord; DRG: dorsal root ganglion


Keywords: dorsal root ganglion,  dura mater,  meningeal infiltration,  perineurium,  scheme,  spinal cord,  subarachnoid space

Nerve infiltration
Figure 2a-b: (a) Nerve infiltration. A. Nerve compression and invasion. B. Intranerval metastasis. C. Tumour spread within the nerve. D. Intravascular lymphoma. EpineurialV: epineurial vessel; EndoV: endoneurial vessel. (b) Spread of tumours along nerves. R & A: Retrograde and anterograde spread (red arrows). Spread via anastomosis a between different nerve territories


Keywords: intranerval metastasis,  intravascular lymphoma,  Invasion,  nerve compression,  nerve infiltration,  scheme,  tumour,  tumour spread