A number of authors [2, 5–9] stated that a small subset of sarcomatoid variant of urothelial carcinoma of the urinary bladder and renal pelvis may exhibit a prominent myxoid stroma, a finding which may mislead the pathologist into making a diagnosis of inflammatory pseudotumour (inflammatory myofibroblastic tumour) but this is characteristically positive for anaplastic lymphoma kinase stains unlike sarcomatoid variant of urothelial carcinoma which is negative. The gene discussed is ALK; the disease is urothelial carcinoma.