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What does PNI stand for?

PNI stands for Perineural Invasion

This definition appears frequently and is found in the following Acronym Finder categories:

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We have 76 other meanings of PNI in our Acronym Attic

Samples in periodicals archive:

There is significant lymph-vascular and perineural invasion (figure 2), which is often associated with positive resection margins.
Common metastatic routes of neoplastic cells are local invasion and lymphatic, hematogenous, and peritoneal dissemination, (10) Perineural invasion is an under-recognized route of metastatic spread, where neoplastic cells spread by local peripheral nerves.
The presence of pathologic signs of early metastatic invasion--vascular emboli, lymphatic invasion, and perineural invasion (VELIPI)--was associated with adverse outcomes during a mean follow-up period of 44.
WASHINGTON -- New evidence suggests that perineural invasion may occur in aggressive nonmelanoma skin cancers more frequently than previously reported and is often overlooked in the examination of margins, speakers said at the Sixth International Conference on Head and Neck Cancer.