[Ring 22 chromosome syndrome induced azoospermia: a case report and literature review].

OBJECTIVE: To investigate the clinical phenotype and genetic characteristics of an azoospermia patient with ring 22 chromosome syndrome. METHODS: We analyzed the clinical data of an azoospermia patient with ring 22 chromosome syndrome and reviewed relevant literature. RESULTS: The patient was a short 29-year-old male, with bilateral testes small in size and soft in texture. Seminal examination indicated azoospermia. Chromosome analysis showed the karyotype of the patient to be 46, XY, r (22) (p11, q25). The level of testosterone was low, and the testicular tissue was brittle and easy to break. Pathological microscopy revealed reduced number of Sertoli cells and germ cells in the seminiferous tubules and thinner layers of cells. All the germ cells were spermatogonia. Neither spermatocytes nor sperm cells were found, which suggested complete spermatogenic failure. Mild interstitial fibrosis was visible in part of the seminiferous tubule walls. CONCLUSION: Patients with ring 22 chromosome syndrome usually represent normal clinical phenotypes. However, this kind of genetic abnormality often induces severe testicular damage and spermatogenic arrest, which may result in azoospermia.