Histopathology. Scale bar (a-c): 500 μm. a H&E staining showing a glandular architecture and fibrous stroma with a prostate-like configuration. b Epithelial cells are strong nuclear positive for NKX3.1. c PSA staining displays a cytoplasmic positivity in the epithelial cells. d In the FISH analysis, two green signals (X chromosome) are visible with no orange signals (Y chromosome), confirming an XX karyotype.