A nuclear membrane, or nuclear envelope, is the lipid bilayer membrane which surrounds the genetic material and nucleolus in eukaryotic cells. The nuclear membrane consists of two lipid bilayersâthe inner nuclear membrane, and the outer nuclear membrane. The space between the membranes is called the perinuclear space, a region contiguous with the lumen (inside) of the endoplasmic reticulum.
An antegrade percutaneous internal/external nephroureteral (PCNU) stent is placed percutaneously, establishing antegrade access to the kidney, ureter, and urinary bladder. A segment of the stent remains outside the patient from the flank, which can be capped or connected to gravity drainage.ephroureteral stents including antegrade, retrograde, or internal (double-J) stents are routinely placed by interventional radiologists. The purpose of this review is to provide a detailed and comprehensive description of indications, contraindications, technique, and various technical challenges of these procedures.
Ureteral Stent Placement. Ureteral stent placement is a procedure to open a blocked or narrow ureter. The ureter is the tube that carries urine from your kidney into your bladder. A stent is a thin hollow plastic tube used to hold your ureter open and allow urine to flow. The stent may stay in for several weeks. Informed consent is a legal document that explains the tests, treatments, or procedures that you may need.