A case of a prenatally recognized hepatic mesenchymal hamartoma is presented and 
the literature reviewed. These tumors are benign and usually present in early 
infancy with symptoms that are related to the mass effect on adjacent organs. 
Radiologic methods used in the past to image this tumor include angiography and 
ultrasound. However, there is no specific radiologic finding, and, therefore, 
the diagnosis is usually made during surgery. Once the tumor is removed, the 
prognosis is generally good. With the increasing use of high resolution 
ultrasound in prenatal diagnosis, this rare tumor should be considered in the 
differential diagnosis of any multicystic mass found in the fetal abdomen. The 
recognition of a mass should then alert the physician to the need for early 
neonatal intervention.