Sporotrichoid lymphocutaneous infections: etiology, diagnosis and therapy.

Sporotrichoid lymphocutaneous infection is an uncommon syndrome that is often misdiagnosed and improperly treated. Of the several hundred cases seen each year in the United States, the majority are caused by Sporothrix schenckii, Nocardia brasiliensis, Mycobacterium marinum or Leishmania brasiliensis. The "sporotrichoid" disease begins at a site of distal inoculation and leads to the development of nodular lymphangitis. Systemic symptoms are characteristically absent. By recognizing the distinct pattern of nodular lymphangitis and focusing on the diverse but limited etiologies, the physician can obtain the appropriate histologic and microbiologic studies and start targeted antimicrobial therapy. Therapy is generally continued for two to three months after the resolution of cutaneous disease.