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Linda Guakil, Ruben D. Lopez-Oliver, Rafael A. Bueno-Garcia, Rafael Valdez, Abelardo Rodriguez; Mycobacterium Avium Complex Orbital Tumor: Case Report. Invest. Ophthalmol. Vis. Sci. 2011;52(14):721.
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To present a clinical case of a male Mexican patient, 49 years old, tobacco grower, with lung tuberculosis antecedent, and orbital tumor due to Mycobacterium Avium Complex
We performed in this patient a complete Opthalmologic exploration, CT scan, MRI, Histopathologic examination.
CT scan and MRI confirmed intraorbital tumor. The histological examination showed data of granulomatous disease, without caseous necrosis, and negative Ziehl Neelsen staining, which discards Mycobacterium Tuberculosis.It was managed with rifampicin 600 mg once a day, ethambutol 400 mg TID and clarithromycin 500 mg BID. The tumor decreased after 6 weeks treatment.
There is no case reports of orbital involvement due to Micobacterium Avium Complex in the literature. Initialy it was thought that the cause of the tumor was due to Mycobacterium Tuberculosis (wich presents ocular involvement in less than 20% of cases). It is also rare that the patient presented with this diagnosis because he is HIV negative. He showed improvement with management for Mycobacterium Avium Complex whithin 6 weeks of treatment, although the treatment duration is 8 months.
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