A rare case of true tibioperoneal trunk aneurysm resulting in foot drop

A 75-year-old man presented with a six-week history of his right foot “making a slapping sound” whilst he walked and consequently having to adopt a “high-stepping gait”. Examination revealed a pulsatile swelling in his right popliteal fossa and signs of a peroneal nerve palsy. Computed tomography angiography (CTA) revealed a 2.5 cm tibioperoneal trunk aneurysm. True aneurysms of the tibioperoneal trunk are rare, and compression of surrounding nerves is an indication for surgical correction. This case highlights the importance of thorough vascular clinical assessment and prompt surgical intervention.