Mesenchymal hamartoma of the liver.

Mesenchymal hamartoma of the liver is the second most common benign liver tumor of childhood. Ultrasonography demonstrates a cystic lesion that may be very large. Computed tomographic scan will further establish the location and its relationship to vascular anatomy. Most will be amenable to gross total resection with clear margins. To illustrate the radiological and gross operative features, we present a 9-month-old male infant with a mesenchymal hamartoma with classic features.