曲細精管直徑與精蟲取得與否有關

曲細精管seminiferous tubules之直徑與精蟲取得與否有關
直徑<200 um可能無精蟲製造
解剖顯微鏡下找較粗(>250um) &不透明曲細精管施行TESE，較易取得精蟲

http://www.jhrsonline.org/article.asp?issn=0974-1208;year=2013;volume=6;issue=2;spage=111;epage=123;aulast=Ashraf



Figure 2: Identification of enlarged seminiferous tubules during micro-TESE: (a) Uniform distribution of collapsed tubules (white arrows) and the presence of one focus of clearly dilated tubules in the center (black arrows); (b) Dilated STs, highlighted in the center (circle), are surrounded by collapsed ones (white arrows). Photomicrographs were taken with the aid of the operating microscope at ×25 magnification




Figure 3: Measurements of seminiferous tubule diameter. A digital imaging system attached to the inverted microscope was used to capture the images of individual STs: (a) Collapsed ST extracted from a patient with failed sperm retrieval; (b) Noncollapsed ST extracted from a patient with failed SR whose testicular histology showed early maturation arrest; (c and d) Enlarged STs extracted from patients with successful SR