This issue of Physical Medicine and Rehabilitation Clinics of North America is devoted to "Difficult to Treat Pain Syndromes," and is edited by Adam L. Schreiber, DO of the Jefferson Medical College of Thomas Jefferson University. Articles in this issue will include: Carpal Tunnel Syndrome Diagnosis; Non-surgical Treatment of Carpal Tunnel Syndrome; Parsonage Turner Syndrome Diagnosis and Treatment; Trochanteric Pain Syndrome Diagnosis and Treatment; Complex Regional Pain Syndrome Diagnosis and Treatment; Discogenic Spine Pain Syndrome Diagnosis and Treatment; Failed Back Surgery Syndrome...