Cutaneous Leishmaniasis in a Saudi Arabian Soldier Stationed in the United States.

Background: Leishmaniasis is a common parasitic disease seen in many parts of the world, especially in areas where current U.S. and international forces are deployed. Approximately 350 million people are thought to be at risk of cutaneous leishmaniasis (CL) with an annual incidence of 1.5 million cases. Over 90% of cutaneous infections with Leishmania occur in the Middle East, Brazil, and Peru. Outbreaks of CL may occur in military personnel deployed to endemic areas. Since the incubation period for symptomatic CL ranges from weeks to months, symptoms may not appear until well after returning to the United States. As operations continue to expand globally, the exposure and concern for leishmaniasis persists for military physicians. We describe localized CL in a previously healthy male in an effort to help medical personnel identify leishmaniasis on the basis of cutaneous lesions alone, as well as increase diagnostic suspicion when treating patients in nonendemic areas.

Results: A previously healthy 30-year-old Saudi Arabian male presented to the emergency department with a 1-month history of four well-demarcated nonhealing, painless ulcers on his left ear, hand, and foot. Symptoms began shortly after arriving in the United States. He had been treated with trimethoprim/sulfamethoxazole, oral clindamycin, mupirocin ointment, and vancomycin for suspected infection without improvement of lesions. Upon presentation to dermatology, physical examination revealed a firm erythematous plaque with central ulceration on his left ear. Two shallow indurated ulcers were also found on his left fourth dorsal finger and left dorsal foot. Biopsy of the foot revealed granulomatous inflammation with predominantly lymphoplasmacytic infiltrate and multinucleated giant cells. Parasitized histiocytes were identified on hematoxylin and eosin stain and focally on Giemsa stain. Polymerase chain was consistent with a diagnosis of leishmaniasis and outpatient treatment was initiated with fluconazole 200 mg daily for 6 weeks. At 2-week follow-up, lesions were noted to be stabilized.

Discussion: CL has a wide variety of presentations. The classic lesion appears as a papule that will enlarge, often developing into a nodule or plaque-like lesion with central ulceration. The lesion may be covered with an eschar or by fibrinous material. This presentation can mimic many disease processes resulting in an extensive differential diagnosis that includes bacterial, fungal, and viral infections, cutaneous malignancy, and insect bites. The clinical course, treatment options, response to therapy, and prognosis are all highly variable and dependent on the causative species. Local therapy options, oral systemic agents, and parenteral agents have all shown varying results in the treatment of leishmaniasis. The difficulty with standardizing treatment options for CL stems from the lack of well-controlled studies and the lack of standardized outcome measures. This deficiency in comparative studies of treatment hinders consensual recommendations. However, the choice of the correct therapy often depends on the experience of the clinician, burden of disease, preferences of patients, and cost-effectiveness considerations for the patient and/or the health care system.