445. A Case of Disseminated Microsporidia Manifesting as Skin Lesions in a Patient with Acute Lymphoblastic Leukemia

BACKGROUND: We present a case of a 65-year-old male with a history of acute B-cell lymphoblastic leukemia (ALL) who presented with fevers and skin lesions. The patient achieved remission after induction chemotherapy. Nineteen months after diagnosis, while on maintenance therapy, the patient presented as noted above. He was instructed to hold maintenance therapy and sent to the hospital. METHODS: RESULTS: On examination, the patient was febrile. He had papules present on the forehead, chest, arms, legs, and back. Physical examination was otherwise unremarkable. Labs were notable for a white blood cell count of 3600/uL (absolute neutrophil 3100/uL) and creatine kinase (CK) of 593 U/L. Blood and urine cultures, Histoplasma, Varicella, Toxoplasma, HIV, and an acute hepatitis panel were negative. CT of the chest, abdomen, and pelvis was unremarkable. He was empirically started on micafungin and valacyclovir. However, he continued to have fevers and myalgias. Wound culture was negative for fungus after four weeks of growth. Skin biopsy immunostains were consistent with an unknown protozoan. Specimens were sent to an outside facility and yielded a diagnosis of Anncaliia algerae. Antibiotics were changed to albendazole and voriconazole, with subsequent improvement in all symptoms. CONCLUSION: Microsporidia most commonly infect immunocompromised hosts. Clinical manifestations of microsporidiosis are extremely diverse. Oftentimes, symptoms are not present in those found to be infected with Microsporidia. A disseminated disease has been identified but remains rare. Although Microsporidia have been identified as a cause of infection in immunocompromised patients, there are few reports of infection in those diagnosed with cancer, and only a few cases have been due to Anncaliia algerae. In studies pertaining to ALL patients, roughly one-fifth of patients were identified as being infected with Microsporidia, but most did not have symptoms. This is the first reported case of disseminated Microsporidia in a patient with ALL and the first disseminated infection presenting as a skin manifestation. Of identified cases of disseminated Microsporidial infection, mortality was high. Thus, prompt recognition of Microsporidia as a cause of infection in patients with ALL is of utmost importance. [Image: see text] [Image: see text] [Image: see text] DISCLOSURES: All authors: No reported disclosures.