A
Deep peroneal nerve injury
B
Superficial peroneal nerve injury
C
Anterior tibial artery pseudoaneurysm
D
Sural nerve injury
Explanation:The anterolateral portal is established lateral to the peroneus tertius tendon. The intermediate dorsal cutaneous nerve (a branch of the superficial peroneal nerve) crosses very close to this area. It is the most frequently injured structure in ankle arthroscopy. Transillumination is recommended to visualize and avoid it. Reference: Ferkel et al., 'Neurological complications of ankle arthroscopy', Arthroscopy (1996).