The CECT shows central dot; which is seen in type 5 choledochal cyst/ Caroli's disease Choledochal cyst.- Characterized by dilatation of bile duct. TODANI modification of ALONSO LEJ classification: -- Type I - dilatation of extra hepatic bile duct (MC)- Type II - diveicular dilatation of extra hepatic bile duct- Type III - dilatation of intraduodenal pa of bile duct (choledochocele)- Type IV (A) - dilatation of both intra and extra hepatic bile duct- Type IV (B) - multiple cyst involving only extra hepatic bile duct - Type V - multiple cyst involving only intra hepatic bile duct (Caroli's disease)