“…Eosinophilic cystitis is a rare disease with various etiology and symptomatology, which can significantly delay diagnosis. EC in children may present with frequency, dysuria, suprapubic pain, nocturnal enuresis, gross or microscopic hematuria, and urinary retention [1,9,10,[14][15][16][17]. In later stages, massive infiltration of the bladder wall may form a mass imitating bladder tumor [2,12,13,[18][19][20][21].…”