Histological criteria assessed for the Weiss score
High mitotic rate
Atypical mitoses
High nuclear grade
Low percentage of clear cells
Necrosis
Diffuse architecture of tumor
Capsular invasion
Sinusoidal invasion
Venous invasion
Postoperative Care
Steroid Replacement. Intravenous steroids (100 mg hydrocortisone IV qds) are maintained until diet is restarted and then converted to oral steroids (hydrocortisone, 20–20–10 mg/day, aiming to decrease by 5 mg/day every 3–5 days).