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Table 1 CRPS 1 criteria according to the International Association for the Study of Pain [2]

From: Bone metastases mimicking Complex Regional Pain Syndrome I: a case report

1. Type 1 is a syndrome that develops after an initiating event
2. Spontaneous pain or allodynia/hyperalgesia occurs, is not limited to the territory of a single peripheral nerve, and is disproportionate to the inciting event
3. There is or has been evidence of edema, skin blood flow abnormality, or abnormal sudomotor activity in the region of the pain since the inciting event
4. This diagnosis is excluded by the existence of conditions that would otherwise account for the degree of pain and dysfunction
  1. For the diagnosis of CRPS 1, criteria 2–4 must be fulfilled.