| PBilNETs | Primary Biliary Neuroendocrine Tumors |
| CCA | Cholangiocarcinoma |
| NETs | Neuroendocrine Tumors |
| PRISMA | Preferred Reporting Items for Systematic Reviews and Meta-Analyses |
| MeSH | Medical Subject Headings |
| MANEC | Mixed AdenoNeuroendocrine Carcinoma |
| MiNEN | Mixed Neuroendocrine–Non-Neuroendocrine Neoplasm |
| CT | Computed Tomography |
| MRI | Magnetic Resonance Imaging |
| MRCP | Magnetic Resonance Cholangiopancreatography |
| ERCP | Endoscopic Retrograde Cholangiopancreatography |
| EUS | Endoscopic Ultrasound |
| PET | Positron Emission Tomography |
| CA 19-9 | Carbohydrate Antigen 19-9 |
| US | Ultrasonography |
| BT | Biliary Tree |
| CgA | Chromogranin A |
| SynA | Synaptophysin |