Testicular sperm from patients with obstructive and nonobstructive azoospermia: aneuploidy risk and reproductive prognosis using testicular sperm from fertile donors as control samples.

Objective: To establish a baseline incidence of chromosomal abnormalities in testicular sperm of fertile men and to determine the best control sample for comparisons with azoospermic males to estimate their reproductive prognosis.

Design: Prospective study.

Setting: Infertility clinic.

Prognostic value of morphometry in low grade papillary urothelial bladder neoplasms.

Objective: To analyze the prognostic value of morphometry in low grade papillary urothelial bladder neoplasms (LGPUBNs).

Study Design: The primary (most common) and secondary (second most common) histologic grades were considered in accordance with the 1998 World Health Organization/International Society of Urological Pathology and the 1999 World Health Organization classifications. With the primary grade, 54 cases were papillary urothelial neoplasms of low malignant potential (PUNLMPs) and 66 low grade papillary urothelial carcinomas (LGPUCs), whereas the secondary grade consisted of 45 PUNLMPs and 75 LGPUCs.

Cytokeratin expression patterns in low-grade papillary urothelial neoplasms of the urinary bladder.

Background: The differential expression patterns of cytokeratin 20 (CK20) and 34betaE12 antigen in low-grade papillary urothelial tumors of the bladder are discussed.

Methods: A retrospective study of 120 patients with low-grade papillary bladder tumors (45 neoplasms of low malignant potential and 75 low-grade WHO G1 carcinomas) was performed. All tumors were graded in accordance with the 1998 World Health Organization/International Society of Urological Pathology (WHO/ISUP) and 1999 WHO classifications.