The etiology of IPO may be idiopathic or secondary to a host of well-recognized underlying pathological conditions, including endocrine, autoimmune, neurologic, paraneoplastic, and iinflammatory/infectious diseases. a broad differential diagnosis. The etiology of IPO may be idiopathic or secondary to a … Continue reading The etiology of IPO may be idiopathic or secondary to a host of well-recognized underlying pathological conditions, including endocrine, autoimmune, neurologic, paraneoplastic, and iinflammatory/infectious diseases