This book, Urinary Systems: Cytology, Histology, Cystoscopy, and Radiology, focuses on urinary cytology, bladder biopsy interpretation, and biopsy diagnosis of renal mass lesions. In addition, a major feature of this atlas-style book, differentiating it from other genitourinary pathology resources, is the incorporation of cystourethroscopic/ureterorendoscopic features of urologic lesions contributed by urologists along with radiologic features of renal mass lesions and ancillary tests for the detection of urothelial carcinoma.