Table 2 Types of cystic lesions in the pancreas based on their lining

Pseudocysts (no lining)

 Conventional pseudocysts

 Paraduodenal wall cyst (cystic dystrophy)

 Infection-related pseudocysts

Cysts with mucinous epithelium

 Intraductal papillary mucinous neoplasms and intraductal oncocytic papillary neoplasms

 Mucinous cystic neoplasms

 ‘Mucinous non-neoplastic cysts’, ‘mucoceles’ and ‘retention cysts’

Serous (clear-cell) cystic tumors

 Serous cystadenoma

 VHL-associated pancreatic cysts

 Serous cystadenocarcinomas

Squamous-lined cysts

 Lymphoepithelial cysts

 Epidermoid cysts within intrapancreatic accessory spleen

 Dermoid cysts

 Squamoid cyst of pancreatic ducts

Cysts lined by acinar cells

 Acinar cell cystadenocarcinomas

 Acinar cell cystadenomas (cystic acinar transformation)

Endothelial-lined cysts

 Lymphangiomas

Degenerative or necrotic changes in solid tumors

 Solid-pseudopapillary tumor

 Cystic change in ordinary ductal adenocarcinoma

 Cystic pancreatic endocrine neoplasia (islet cell tumors)

 Cystic change in other invasive carcinomas

 Cystic mesenchymal neoplasms

Other rare cystic lesions

 Cystic hamartomas

 ‘Enterogenous’ (congenital; duplication) cysts and duodenal diverticula

 Endometriotic cyst

 Secondary tumors

 Congenital or developmental cysts

 Others

 Unclassified cysts