Linear EUS of the Stomach Bapaye, Amol; Aher, Advay
Practical Handbook of Endoscopic Ultrasonography
Book Chapter
EUS is effective in evaluation of lesions of the gastric wall and the perigastric area. Although radial EUS or catheter probe is often preferred for assessment of gastric lesions, linear EUS provides ...optimum scanning of this region and also permits FNA at the same time.
EUS is accurate in identification and evaluation of mediastinal mass lesions. Tissue acquisition of these lesions has always been a challenging task. FNA can be performed under EUS guidance under ...real-time vision with precise needle control and accurate needle placement inside the tumor. Doppler further improves safety of the procedure. A majority of mediastinal lesions do not require surgery as primary treatment, and therefore EUS helps to prevent an unnecessary thoracotomy in these patients 1, 2.
The esophagus is a tubular organ and is often scanned using the radial echoendo-scope. Linear EUS is equally effective in scanning the esophagus and mediastinum, and must be used whenever ...interventions are planned.
The linear echoendoscope (EG-530UT) has a curved transducer facing on one side. This provides a 120° sector scanning ultrasound view. The working channel opens just above the transducer and the ...instruments (commonly needle) can be seen on the ultrasound view. This permits EUS guided biopsies and interventions to be performed. The channel is wide (3.8 mm) and allows passage of instruments up to 10 Fr. diameter through the endoscope.
Preoperative tissue diagnosis of mass lesions in the biliary pancreatic region has always been a challenging task. EUS guided fine needle aspiration (FNA) provides an impressive solution to this ...preoperative dilemma. EUS permits real-time imaging from close quarters which allows precise control and accurate needle placement and permits accurate biopsy to be performed.
Linear EUS of the Anorectum Bapaye, Amol; Aher, Advay
Practical Handbook of Endoscopic Ultrasonography
Book Chapter
The utility of endorectal and endoanal ultrasound has evolved in the last few years 1. Both radial and linear EUS are used for evaluation of anorectal diseases. Radial EUS is preferred for ...examination of anal canal whereas linear is preferred for rectal and para rectal examination and to perform interventions.
Fluid collections around the pancreas occur as a sequel to an attack of acute pancreatitis, or less often secondary to ductal obstruction in chronic pancreatitis. Not all fluid collections around the ...pancreas are called pseudocysts (PPC’s). A PPC is a well demarcated collection of fluid rich in pancreatic enzymes and having a well defined wall of fibrous or granulation tissue 1. Formation of a PPC requires at least 4 weeks from the onset of pancreatitis. Before 4 weeks, it is called a pancreatic fluid collection (PFC). PPC’s are usually sterile. In presence of pus, they are called pancreatic abscess. Some amount of solid debris is often found in the floor of a PPC, even without active infection 1.
EUS offers excellent scanning views of the biliary-pancreatic region. Linear EUS can evaluate the biliary-pancreatic area with similar precision as that by radial EUS and in addition, allows FNA or ...other interventional procedures to be performed at the same time 1.
Techniques of EUS-FNA Bapaye, Amol; Aher, Advay
Practical Handbook of Endoscopic Ultrasonography
Book Chapter
EUS-FNA is the commonest intervention performed through the EUS endoscope. Mass lesions or enlarged lymph nodes in the mediastinum, retroperitoneum and pancreas or in the gut wall require tissue ...diagnosis to plan optimum treatment strategies. EUS-FNA was first described by Vilmann et al. in 1992 1.