RESUMEN
BACKGROUND: Amenorrhea may occur in patients with lupus treated with cyclophosphamide. This is commonly attributed to primary ovarian failure leading to infertility -- a possible complication of cyclophosphamide. Urogenital tuberculosis (TB) can be a rare cause of amenorrhea and infertility in lupus patients.OBJECTIVE: To present a case of endometrial TB causing amenorrhea and abnormal uterine bleeding in a patient with lupus nephritis treated with cyclophosphamide.CASE: A 32-year-old Filipino female, who was diagnosed with lupus nephritis, was managed with high dose steroid and intravenous (IV) cyclophosphamide. Lupus nephritis improved with treatment, but she subsequently developed amenorrhea and vaginal spotting for two months. Symptoms were initially attributed to premature ovarian failure due to cyclophosphamide.Gynecologic examination showed thickened endometrium with normal ovaries and uterus on ultrasound. Dilatation and curettage was performed. Histopathology of endometrial curetting revealed chronic granulomatous endometritis with Langhans giant cells. Endometrial TB was diagnosed, and anti-Koch's therapy was started. The patient showed a favourable response, with resumption of normal menstruation after only the first month of treatment.CONCLUSION: This paper emphasizes the importance of considering a wide range of differential diagnosis for gynecologic symptoms in patients with lupus. Tuberculosis should be considered in areas of high endemicity