Magnan's sign

Magnan's sign
   Also known as Magnan-Saury's sign and cocaine bugs. The eponym Magnan's sign refers to the French alienist Jacques Joseph-Valentin Magnan (1835-1916), who described the concomitant phenomenon in 1889 in a paper co-authored by a pupil named Saury (hence the second eponym, Magnan-Saury's sign). Both eponyms refer to a crawling, " tactile hallucination of a foreign body under the skin that is associated with the chronic use of cocaine. Save the association with cocaine, Magnan's sign is comparable with "formication.
   Magnan, V., Saury, M. (1889). Trois cas de cocainisme chronique. Comptes Rendus Hebdomadaires des Séances et Mémoires de la Société de Biologie, 41, 60-63.

Dictionary of Hallucinations. . 2010.

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  • Magnan's sign — is a clinical sign in which people with cocaine addiction experience paraesthesia which feels like a constantly moving foreign body, such as fine sand or powder, under the skin.[1] The sign is named after Valentin Magnan. External links Magnan s… …   Wikipedia

  • Magnan movement sign — Mag·nan movement, sign (mah nyahґ) [Valentin Jacques Joseph Magnan, French psychiatrist, 1835–1916] see under movement and see formication …   Medical dictionary

  • Magnan-Saury's sign —    see Magnan s sign …   Dictionary of Hallucinations

  • Sign — Any abnormality that indicates a disease process, such as a change in appearance, sensation, or function, that is observed by a physician when evaluating a patient. * * * 1. Any abnormality indicative of disease, discoverable on examination of… …   Medical dictionary

  • Magnan — Valentin J.J., Paris psychiatrist, 1835–1916. See M. trombone movement, M. sign …   Medical dictionary

  • Valentin Magnan — (1835 1916) was a French psychiatrist who was a native of Perpignan. He studied medicine in Lyon and Paris, where he was a student of Jules Baillarger (1809 1890) and Jean Pierre Falret (1794 1870). From 1867 until the end of his career he was… …   Wikipedia

  • Magnan sign — formication …   Medical dictionary

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  • cocaine bugs —    Also known as Magnan s sign and Magnan Saury s sign. All three terms refer to a * tactile hallucination consisting of a crawling foreign body beneath or upon the skin that is associated with the chronic use of cocaine. Except for their… …   Dictionary of Hallucinations

  • formicative hallucination —    Also referred to as formication, dermatozoic hallucination, and insect hallucination. The terms formication and formicative hallucination are indebted to the Latin noun formica, which means ant. All of the above four terms are used more or… …   Dictionary of Hallucinations

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