Mesenchymal hamartoma is a rare and benign tumor.. Representing 5 to 8 % of 
children's hepatic tumors, it is rarely described in adults. Authors report a 
new case of hepatic mesenchymal hamartoma in a 21-year-old woman, diagnosed 
after a sudden onser of clinical and biological cholestasis. Abdominal US and 
CTscan exminations showed a medial liver tumor with cystic formations suggestive 
of a hydatid cyst. The diagnosis of hepatic mesenchymal hamartoma was based onn 
hitology of the resected liver specimen. Radiological findings can suggest the 
diagnosis but only histology can confirm it. Treatment is surgical involving in 
most of the cases; a wide hepatic resection because of the size of the tumor. 
Progosis is excellent when complete exeresis is possible.