PNM classification of alveolar echinococcosis (according to WHO-IWGE, 2006).
|PNM||Location and extension of the lesion|
|P||Hepatic localization of the parasite|
|P X||Primary parasite cannot be assessed|
|P 0||No detectable parasite in the liver|
|P 1||Peripheral lesions without proximal vascular and/or biliary involvement|
|P 2||Central lesions with proximal vascular and/or biliary involvement of one lobea|
|P 3||Central lesions with hilar, vascular, or biliary involvement of both lobes and/or with involvement of two hepatic veins|
|P 4||Any liver lesion with extension along the vesselsb and the biliary tree|
|N||Extrahepatic involvement of neighboring organs [diaphragm, lungs, pleura, pericardium, heart, gastric and duodenal wall, adrenal glands, peritoneum, retroperitoneum, parietal wall (muscles, skin, bone), pancreas, regional lymph nodes, liver ligaments, kidneys]|
|N X||Not evaluable|
|N 0||No regional involvement|
|N 1||Regional involvement of contiguous organs or tissues|
|M||The absence or presence of distant Metastasis [lungs, distant lymph nodes, spleen, CNS, orbital, bones, skin, muscle, kidneys, distant peritoneum, and retroperitoneum]|
|M X||Not completely evaluated|
|M 0||No metastasisc|
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