There are multiple definitions:

1. percutaneous nephrolithotomy(English)

   • procedure of choice for the treatment of large or complex renal calculi. Is usually performed with the patient in prone position through a posterior calyx. The long-term complications include loss of function, perinephric collection, recurrent urinary tract infection, stricturing of the collecting system, urethral stricture, and stone recurrence; also as PCNL
   • CSRF, PCNL, LSD, SSS
   • Nephrology, Surgery
   • https://doi.org…0970-1591.44281

2. posterior nipple line(English)

   • criterion to predict the acceptability of the presentation of the pectoral muscle in the mediolateral oblique view of the breast, using the width and length of the pectoral muscle
   • MLO
   • Mammary gland, Medical imaging
   • https://doi.org…rad.2010.06.026