Fibrosis, calcification, and even ossification may be seen. Peliosis hepatis is a tumor-like condition affecting liver that must be considered when evaluating vascular lesions. Rarely intraperitoneal hemorrhage and death may occur. Lipomas occur rarely in the liver and are usually incidental findings. The smooth muscle elements usually predominate.
Vessels consist of tortuous arteries and veins.
Despite their resemblance to their namesake in the kidney, they are not associated with tuberous sclerosis. If there is a known cause, such as healing abscess or trauma, the term is not used, although the histological features may be identical. It is probably heterogenous in etiology. Miscellaneous benign tumors include lymphangiomas, leiomyomas, fibromas, and myxomas. All are quite rare, and are recognized by their resemblance to similar tumor types arising in other organs.