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[[Image:Prostatic adenocarcinoma with perineural invasion.JPG|thumb|right|300px|Perineural invasion in prostate carcinoma. [[H&E stain]].]] | |||
'''Perineural invasion''', also known as '''perineural tumour''', is the presence of a tumour within the nerve sheath. It is abbreviated as '''PNI'''. | '''Perineural invasion''', also known as '''perineural tumour''', is the presence of a tumour within the nerve sheath. It is abbreviated as '''PNI'''. | ||
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