The foot and the ankle are the usual localisations of diabetic neuroarthropathy. The knee is rarely affected. Diabetic neuropathy and microangiopathy also cause skin fragility causing trophic disorders and ulcers. Diabetic bullosa is rare. We report the case of a 19-year-old female patient with type 1 diabetes complicated by knee neuroarthropathy and diabetic bullosa.

Primary pseudo-tumoral calcinosis is a rare genetic disease due to a disorder of phosphorus metabolism characterized by the formation and deposition of calcium phosphate crystals in the peri-articular regions. The treatment is based on the reduction of hyperphosphatemia by hygienic and nutritional measures, hypophosphatemic drugs and surgery. We report the case of a 19-year-old patient followed since the age of 3 years for a primary pseudo-tumoral calcinosis that was resistant to surgery and that had well progressed with aluminum hydroxide and acetazolamide. Treatment combining aluminum hydroxide and acetazolamide with hygienic and nutritional measures seems to be an interesting therapeutic option for this pathology.