Medusa head appearance on MRI is seen in
Veins are small at periphery and gradually enlarge as they approach a central draining vein - caput medusa or medua head.
serpentine apperance of the curvilinear peripheral draining veins seen in venous malformation (venous angioma).
AV malformation
Venous angioma
Cavernous hemangioma
Vein of galen malformation