Fig. 1

Serous borderline tumour of the testis: Ultrasound examination shows an unilocular cyst with intracystic papillae (a). Histologically, the tumour shows papillary structures encased by a fibrous wall with cystic areas filled with clear fluid (b; x20). The tumour cells present with mild cytologic atypia and eosinophilic cytoplasm, the nuclei show a predominantly dense chromatin with prominent nucleoli (c; x40 and d; x100; e, x200; f, x200; g, x400; h, x600)