A Very Rare Case Report of Neuroendocrine Tumor of the Inguinal Node

Background & Aim: Endocrine tumors are amongst the neoplasms with low prevalence that are found most often in the gastrointestinal tract, breast, and infrequently in the lymph nodes of the inguinal region. Case report: In this report a 42-years woman who referred to a doctor with a chief complaint about the presence of a mass in the right thigh. The mass was removed by surgery and after being sampled and tested, referred to an oncologist. Pathological examinations indicated a metastasis of carcinoma with unknown origin. According to results of immunohistochemical staining, Neuroendocrine Grade 1 tumor was detected with Ki 67 index = 1%. Except for ultrasound that was indicating the presence of a non-cancerous cyst in the left breast, the rest of the blood tests and imaging did not mention a particular problem. Since this tumor was reported without the involvement of other organs and initially in the lymph node of the inguinal region and after the removal of the mass, patient status was reported to be stable, no specific treatment was performed and only follow up was done for the patient. Conclusion: Regarding the low prevalence of neuroendocrine tumors and the clinical similarity to other cases, accurate clinical examinations, in particular, specific staining, can be useful for precise diagnosis of neuroendocrine tumors.