Sterile Pyuria is characteristically seen in -
Renal Tuberculosis
Chronic Hydronephrosis
Wilm's Tumor
Neuroblastoma
Urinary frequency, dysuria ,nocturia, hematuria and flank or abdominal pain are common presentations. The documentation of culture negative pyuria in acidic urine should raise the suspicion of TB. Ref:Harrison 20 th edition pg no 1244
Kidney