Dermatologic Manifestations of Mycobacterium Marinum Infection of the Skin Clinical Presentation
- Author: Joslyn S Kirby, MD; Chief Editor: Dirk M Elston, MD more...
History
Patients at risk include anglers (commercial, recreational), oyster workers, swimmers, aquarium workers, and individuals with aquariums in their homes. Infection has also been reported following natural disasters involving the ocean.[6]
Patients may present with a papule, nodule, or ulcer at the site of trauma and a history of exposure to nonchlorinated water 2-3 weeks earlier. Patients may give a history of a papule or nodule that subsequently ulcerated and/or (1) signs of the infection spreading up the finger or hand or (2) involvement of the local joint or tendons. Over a period of months, localized cutaneous disease can spread to soft tissues.
Localized pain and induration are common. Fever, lymphadenopathy, and systemic infection are rare, with the exception of in immunosuppressed patients.
Physical
An erythematous or bluish 0.5- to 3-cm papule or nodule develops at the inoculation site. Ulceration can occur later, and subsequent lesions may be present along the path of lymphatic drainage of the extremity. This occurs in 25-50% of patients and is termed sporotrichotic spread.
The upper extremity is the inoculation site in 90% of cases.
Lymphadenopathy may be present.
Patients may have deeper involvement, with tenosynovitis, bursitis, septic arthritis, and osteomyelitis of the underlying bone. Dissemination to the bone marrow and abdominal viscera is rare.
If diagnosis is delayed, the infections can mimic rheumatoid arthritis, gout, trauma-related tenosynovitis, foreign body, deep fungal infections, or malignancy.
Causes
The cause is infection with M marinum. Exposure of traumatized skin to affected aqueous environments (fish tanks) is the leading predisposing factor. Individuals who are consistently exposed to the organism are more likely to develop the infection. Hosts who are immunocompromised are also at increased risk.
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