Marjolin's ulcers are malignancies that arise in chronic venous ulcers, scars, burns, long standing wounds or sinuses. Radiography provides important information regarding bone destruction and periosteal reaction, and magnetic resonance (MR) imaging provides excellent soft tissue detail, like tumour extent, depth, margins, any underlying bone cortical or marrow involvement, or involvement of adjacent neuro-vascular structures. We report two cases of Marjolin's ulcer and describe their radiographic and MR appearances.