An uncommon cause of warm foot

Description

A 66-year-old man presented with swelling and redness of right foot of 1 month duration. He was a known diabetic for 20 years; glycaemic control was suboptimal. There was no history of trauma, fever, ulcer or deformity. He had numbness of both feet and was earlier documented to have mild non-proliferative diabetic retinopathy. On examination, he was not feverish with erythema, swelling (figure 1), local rise of temperature of the right foot and a difference of 2°C between both feet and no tenderness on palpation. There was loss of protective sensations with absent ankle jerks with bounding pulses in both feet. Systemic examination was unremarkable. His blood investigations revealed haemoglobin of 12 g/dL (N 12–15), total white cell count of 9.8x10⁹ /L/cmm (N 4000–11000), erythrocyte sedimentation rate of 48 mm/hour and haemoglobin A1c of 8.1% (n<5.7). Based on history and clinical findings and absent elevation of acute inflammatory markers, a diagnosis of acute...

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