E. Solitary fibrous tumor
Solitary fibrous tumors are rare mesenchymal tumors that often affect serosal surfaces such as pleura; however, the tumor has also been described in other organs, including the liver.
Most of the tumors are benign (78% to 88%), though some are considered malignant (12% to 22%), showing the presence of increased mitotic activity and necrosis features more closely associated with malignant tumors.
The prognosis for benign solitary fibrous tumors is excellent, though even tumors with bland histological features have the potential to recur (about 8%). The treatment for these tumors is surgical resection.