PAS (+) diastase-resistant granular to crystalline cytoplasm material
MyoD1 : negative
S100 protein : negative
CD 34: negative
Calretinin: Positive (46%) (2)
Rhomboid intracytoplasmic membrane-bound crystals
Granular cell tumour
Granularity of cytoplasm is more coarse
TFE3- positive in 91% (2)
Renal cell carcinoma Xp11.2 associated
Absence of renal mass
Poorly responsive to adjuvant chemotherapy.
Surgical excision is the treatment of choice
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