Frostburg's reverse 3 sign is seen in –
Reversed '3' sign of frost berg  → Carcinoma head of pancreas.
Double duct sign → Periampullary carcinoma.
"Beaded appearance" of biliary ducts → Primary sclerosing cholangitis.
Periampullary carcinoma
Annular pancreatic carcinoma
Carcinoma head of pancreas
All