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Regional bone change in intramuscular haemangioma mimicking primary bone tumour

Intramuscular haemangiomas are benign soft‐tissue tumours, commonly located in the extremities. We present a right‐leg intramuscular haemangioma with florid periosteal reaction in adjacent tibia, mimicking a primary bone tumour. Plain radiograph and magnetic resonance imaging features are illustrated with the surgical and histopathological findings. Radiologists need to be familiar with reactive bone changes secondary to deep‐seated intramuscular haemangiomas to avoid potential misdiagnosis.