It is a single uniocular cyst lined by a single layer of cuboidal, bile duct epithelium. These cysts vary in size 1-20 cm and more common in females then males.  Patients are usually asympotmatic.

Symptoms can be abdominal pain, infection, rupture, or hemorrhage.

Diagnosis: CT and Ultrasound.

Treatment: Excision and drainage, guided percutaneous drainage is one of the options (chances of recurrence are high).