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Adult testicular granulosa cell tumour: an extremely rare entity. Adult granulosa cell tumours are extremely rare and usually benign but sometimes can assume an aggressive behaviour. A 31-year-old man presented with a 45 mm testicular mass. Radical orchiectomy was performed. Histological examination showed elongated cells, with hyperchromatic nuclei and Call-Exner bodies. Immunohistochemical analysis revealed positivity to vimentin, inhibin and negative PLAP and AE1/AE3 staining. The patient did not receive any adjuvant therapy and remained asymptomatic during 10 years. There are few cases of adult granulosa cell tumours and there is no consensus regarding malignancy criteria, treatment and follow-up. The description of these entities is crucial to allow a better management of these patients.