Lymphangiomas are benign tumours, almost exclusively found in children. Primary work-up includes imaging. We report a case of lymphangioma in the leg in an adult patient, initially masked as a myxoma. Our patient underwent ultrasound, computerised tomography, and magnetic resonance imaging, which were suggestive of myxoma. Treatment for lymphangioma varies from sclerotherapy to definitive surgical management. In our case, surgical management was selected under consideration of myxoma; however, histopathology confirmed lymphangioma. Lymphangiomas in adult patients can be masked by other conditions and should be considered as a differential in lower leg swellings.