MKI67 and neoplasm: Immunohistochemistry revealed TFE3 (+), MyoD1 (-), Ki67 (8%), Desmin (partial +), S100 (-), SMA (interstitial+), CD56 (weak +), and periodic acid–Schiff (PAS)-positive and amylase-resistant rod-shaped crystals in the cytoplasm of the tumour cells (Fig. 2a-e).