An unusual testicular tumour with features of both sex cord tumour with annular tubules and large-cell calcifying Sertoli cell tumour is described. The tumour occurred in a 20-year-old man in the left testis as a 1 cm-measuring well circumscribed solitary lesion. Histologically, it showed sertoliform annular tubules with included eosinophilic nodules as well as isolated large cells and cords to sheets of the cells lying in a sclerosing stroma. A few psammomatous microcalcifications were seen. In contrast to similar cases reported before, the patient did not have any signs of Peutz-Jeghers syndrome, feminization or other complex dysplastic syndromes. The case indicates that tumours of this type may occur in phenotypically normal patients like pure large cell calcify- ing Sertoli cell tumours or ovarian sex-cord tumours with annular tubules. It further supports a close histogenetic relationship between these two entities.

        Key words: large-cell calcifying Sertoli cell tumour - Peutz-Jeghers syndrome - Sertoli cell tumour - sex- cord tumour with annular tubules - testis