Benign neoplasms of smooth muscle of the kidney are a rare neoplasm. A 55 year old female presented with the history of abdominal discomfort. Ultrasonographic findings showed a large hypoechoic area in the right kidney measuring 21 x 28 mm, rest of the scan was within normal limits. Contrast enhanced CT scan of the abdomen showed a large enhancing mass lesion in the pelvis of the right kidney, suggestive of leiomyoma. Introduction Leiomyomas are benign neoplasms of smooth muscles that commonly arise in tissues with a high content of smooth muscles such as uterus. Case A 55 years old female non diabetic non smoker presented in the department of urology with the chief complaints of pain abdomen for the last 2 months. The patient has a negative history of fever and or trauma, her general physical condition was normal with normal blood pressure and pulse, all other basic haematological investigations were done and were within normal limits. Contrast enhanced CT Scan of the abdomen showed a large enhancing mass lesion in the pelvis of the right kidney, suggestive of leiomyoma (Figure I)
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机译：肾脏平滑肌的良性肿瘤是一种罕见的肿瘤。一名55岁的女性有腹部不适的病史。超声检查发现右肾有一个较大的低回声区，大小为21 x 28 mm，其余扫描均在正常范围内。腹部增强CT扫描显示右肾盂骨肿块明显增大，提示平滑肌瘤。简介平滑肌瘤是平滑肌的良性肿瘤，通常出现在子宫等平滑肌含量高的组织中。病例A 55岁女性非糖尿病非吸烟者在泌尿科就诊，最近两个月主要表现为腹部疼痛。该患者有发烧和/或外伤的阴性史，其总体身体状况正常，血压和脉搏正常，所有其他基本血液学检查均已完成且均在正常范围内。对比增强的腹部CT扫描显示右肾盂骨肿块明显增大，提示平滑肌瘤（图I）
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