Janeway lesions are rare, non-tender, small erythematous or haemorrhagic macular, papular or nodular lesions on the palms or soles only a few millimeters in diameter that are associated with infective endocarditis and often indistinguishable from Osler's nodes.
|Symptoms||Painless red flat papules on palms and soles.|
|Duration||Days to weeks|
|Differential diagnosis||Osler's nodes|
Janeway lesions are painless, frequently haemorrhagic lesions seen most commonly on the palms and soles, particularly on the base of the thumb and little finger, and seen in infective endocarditis.
Osler's nodes and Janeway lesions are similar and point to the same diagnostic conclusion. The only noted difference between the two is that Osler's nodes present with tenderness, while Janeway lesions do not.
Pathologically, the lesion is described to be a microabscess of the dermis with marked necrosis and inflammatory infiltrate not involving the epidermis.
They are caused by septic emboli which deposit bacteria, forming microabscesses. Organisms may be cultured from the lesions.
Janeway lesions present as red, painless macules and papules on the palms and soles.
They are not common and are frequently indistinguishable from Osler's nodes. Rarely, they have been reported in cases of Systemic lupus erythematosis (SLE), Gonococcemia (disseminated gonorrhoea), haemolytic anaemia and typhoid fever.
They may last days to weeks before completely resolving.
Janeway lesions are named after Edward Janeway (1841–1911), a prominent American physician, pathologist and contemporary of Sir William Osler, who initially described "peculiar skin lesions" in some people with endocarditis, in a paper published in 1899. The term was first used by internist and pathologist Emanuel Libman, who reported the lesions in his paper of 1906 and explained his reasoning for using the term "Janeway lesions" in a footnote in 1923. Osler never mentioned Janeway lesions. The inclusion into Osler's 1925 textbook came six years after Osler died.
- "Osler nodes and Janeway lesions | DermNet NZ". www.dermnetnz.org. Retrieved 2 October 2019.
- Farrior, J.B.; Silverman M.E. (1976). "A consideration of the differences between a Janeway's lesion and an Osler's node in infectious endocarditis". Chest. 70 (2): 239–243. doi:10.1378/chest.70.2.239. PMID 947688.
- Mandell, Douglas, Bennett's Principles and Practice of Infectious Diseases, 7th ed., Churchill Livingstone (2009).
- Patterson, James W. (2016). "8. The Vasculopathic Reaction Pattern". Weedon's Skin Pathology (4th ed.). Churchill Livingston. pp. 239–240. ISBN 9780702051838.
- Jordan Prutkin, W. Bruce Fye (2006). "Edward G. Janeway, Clinician and Pathologist" (PDF). Clinical Cardiology. 29 (8): 376–377. doi:10.1002/clc.4960290815. PMC 6654287.CS1 maint: uses authors parameter (link)