The calculator in question is the "Liver Decompensation Risk After Hepatectomy in Hepatocellular Carcinoma" calculator. This tool is specifically designed for patients diagnosed with hepatocellular carcinoma (HCC) who are undergoing hepatectomy, a surgical procedure to remove part or all of the liver. 

The clinical utility of this calculator is to predict the risk of postoperative liver decompensation, a serious complication that can occur after hepatectomy. Liver decompensation refers to a significant decline in liver function, which can lead to life-threatening conditions such as hepatic encephalopathy, ascites, or variceal bleeding. 

This calculator helps clinicians to make informed decisions about the appropriateness of hepatectomy in individual patients, by balancing the potential benefits of surgery against the risk of postoperative liver decompensation. 

Exclusion criteria for the use of this calculator may include patients with non-hepatocellular liver cancers, those who are not candidates for surgery due to other medical conditions, or those with pre-existing severe liver dysfunction.

Liver decompensation risk after hepatectomy in hepatocellular carcinoma

# Criteria
 ## Portal hypertension
A. No
B. Yes
## Extension of hepatectomy
C. Minor (removal of < 3 liver segments)
D. Major (removal of >= 3 liver segments)
## Model for End-Stage Liver Disease score
E. <= 9
F. > 9

# Conditions
- A and C and E
- (A and C and F) or (A and D) or (B and C)
- B and D
- true