Paraneoplastic skin disorders: a review.

Paraneoplastic disorders are manifestations of internal malignancies without the direct action of the tumor. Its pathogenesis involves production of substances that interfere with cellular activity of distant tissues. Paraneoplasias may be the first sign of cancer, and clinicians should be familiarized with its manifestations in order to perform an early diagnosis of the underlying neoplasm. The aim of this review was to describe most common paraneoplastic skin diseases.