A case of primary renal carcinoid tumor
Carcinoid tumors are low-grade malignant tumors that arise from neuroendocrine cells. Published in the journal Urology Case Reports, the authors describe a case of a 37-year-old female with a primary renal carcinoid tumor without any evidence of metastasis.

This 37-years-old female patient had past history of hypertension and obesity but denied any other systemic diseases. According to the patient, she has had hypertension for 5-6 years. Although with regular medical control, her blood pressure was still around 130–140 mmHg. Under the suspicion of secondary hypertension, kidney echo was arranged on 2015/05/26 and showed a 2.5cm right renal tumor.

She had no fever, hematuria, flank pain nor loss of body weight. Urine analysis revealed no positive finding. Abdominal CT showed a nearly 3 cm mild contrast enhancing mass lesion in right renal sinus. CT guided biopsy reported an epithelial neoplasm with neuroendocrine features. After discussion with the patient, right radical nephrectomy was performed on 2015/8/13.

Pathology reported a primary carcinoid tumor about 2.4 × 2.3 × 2.1 cm in size and consisted of trabecular or ribbon-like arrangement of monotonous tumor cells with oval nuclear and salt-and-pepper chromatin.

Immunohistologically, the tumor cells were positive for Synaptophysin and CD56, the level of proliferation marker Ki-67 was <2%. She recovered smoothly and was discharged on 8th post-operation day. There was no evidence of metastasis and the hypertension was under better control during the 10 months follow-up period.

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