From: Primary extrahepatic alveolar echinococcosis of the lumbar spine and the psoas muscle
P | Hepatic localization of the parasite |
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PX | Primary tumor cannot be assessed |
P0 | No detectable tumor in the liver |
P1 | Peripheral lesions without proximal vascular and/or biliary involvement |
P2 | Central lesions with proximal vascular and/or biliary involvement of one lobe (a) |
P3 | Central lesions with hilar vascular or biliary involvement of both lobes and/or with involvement of two hepatic veins |
P4 | Any liver lesion with extension along the vessels (b) and the biliary tree |
N | Extra-hepatic involvement of neighboring organs [diaphragm, lung, pleura, pericardium, heart, gastric and duodenal wall, adrenal glands, peritoneum, retroperitoneum, parietal wall (muscles, skin, bone), pancreas, regional lymph nodes, liver ligaments, kidney] |
NX | Not evaluable |
N0 | No regional involvement |
N1 | Regional involvement of contiguous organs or tissues |
M | The absence or presence of distant Metastasis [lung, distant lymph nodes, spleen, CNS, orbita, bone, skin, muscle, kidney, distant peritoneum and retroperitoneum] |
MX | Not completely evaluated |
M0 | No metastasis (c) |
M1 | Metastasis |