Comprehensive Sonographic Evaluation of GI Tract, Scrotum, and Spleen

Vocabulary practice flashcards generated from lecture notes covering gastrointestinal, scrotal, and splenic sonographic anatomy, clinical protocols, measurements, and pathologies.

Intraluminal Bowel Mucosa Layer

The 1st, echogenic layer of the bowel wall that directly contacts intraluminal contents.

Bowel Wall Submucosa Layer

The 2nd, hypoechoic layer of the bowel wall that contains blood vessels and lymph channels.

Normal Bowel Wall Thickness

Measures an average of $3\,mm$ when distended and $5\,mm$ when undistended.

Gastroesophageal Junction Sonographic Appearance

A target-shaped or bull's-eye structure seen sagittal to the left of midline, located anterior to the aorta and posterior to the left lobe of the liver.

Keyboard Sign

The sonographic visualization of valvulae conniventes in the duodenum and jejunum appearing as linear echo densities spaced $3$ to $5\,mm$ apart.

McBurney's Point

The midpoint of a line drawn from the right anterosuperior iliac spine to the umbilicus, which lies over the root of the appendix.

Normal Testicular Dimensions

Adult testicles measure $3$ to $5\,cm$ in length, $2$ to $4\,cm$ in width, and approximately $3\,cm$ in height.

Virtual Convex Imaging

A technical imaging feature used in superficial scrotal sonography that adds $20\%$ more viewing area to the field of view.

Seminiferous Tubules

Tubules located inside the $>250$ to $400$ conical lobules of each testis that converge at the apex of each lobule and anastomose to form the rete testis in the mediastinum.

Mediastinum Testis

A vertical septum formed by the reflection of the tunica albuginea into the posterior testis, appearing sonographically as a bright, hyperechoic line coursing craniocaudad.

Tunica Vaginalis

A two-layered membrane lining the inner scrotal wall (parietal layer) and surrounding the testis and epididymis (visceral layer), defining the fluid-filled space where hydroceles form.

Ampulla of Deferens

The dilated terminal portion of the vas deferens located near the seminal vesicle.

Verumontanum

The exact junction where the ejaculatory ducts join with the urethra.

Testicular Arterial Pathway

Blood flow originating from the testicular artery (arising from the aorta below the renal arteries), branching into the capsular artery, then the centripetal artery, and finally the recurrent rami (centrifugal) arteries.

Testicular Venous Drainage

Drainage via the pampiniform plexus into three sets of anastomotic veins, where the left testicular vein drains into the left renal vein and the right testicular vein drains directly into the inferior vena cava.

Spleen Location and Anatomical Boundaries

An intraperitoneal organ situated in the left hypochondrium between the stomach fundus and diaphragm, with a lower pole extending to the midaxillary line and a bare area at the hilum.

Normal Adult Spleen Measurements

Measures $13\,cm$ in length, $7\,cm$ in width, and $3$ to $4\,cm$ in thickness.

Wandering Spleen

A spleen that has migrated from its normal position in the left upper quadrant to another location in the abdomen or pelvis.

Accessory Spleen

A common congenital anomaly presenting as a homogeneous structure with an echo pattern identical to the spleen, usually found near the hilum or inferior border.

Leukocytosis

An elevated white blood cell count indicating infection or inflammation.

Thrombocytopenia

A decrease in the number of blood platelets, which is associated with hemorrhage.

Gastric Duplication Cysts

Embryologic mistakes lined with alimentary tract epithelium, possessing a well-developed muscular wall, contiguous with the stomach, and most commonly found on the greater curvature.

Trichobezoar

A classification of gastric bezoars composed of ingested hair balls, most frequently found in young women.

Phytobezoar

A classification of gastric bezoars composed of ingested vegetable matter, such as unripe persimmons.

Gastric Leiomyoma

The most common type of benign gastric wall tumor, presenting as a small, asymptomatic intramural mass similar in appearance to a carcinoma.

Gastric Carcinoma Sonographic Features

Malignant stomach tumor demonstrating abnormal gastric wall thickening greater than $4\,mm$ along with a target sign or pseudokidney appearance.

Gastric Lymphoma

A primary GI tumor comprising $3\%$ of stomach tumors, appearing sonographically as a large hypoechoic mass, thickened gastric walls, and a spoke wheel pattern.

Volvulus

A closed-loop obstruction caused by an abnormally short mesentery, demonstrating a U shape in sagittal view, a C shape in transverse view, and a clockwise whirlpool sign on color Doppler.

Acute Appendicitis Sonographic Criteria

Inflammation of the appendix characterized by a maximal outer diameter greater than $6\,mm$, an edematous wall thickness greater than $2\,mm$, and a target-shaped cross-sectional appearance.

Meckel Diverticulum

A non-compressible pouchlike herniation located on the antemesenteric border of the ileum approximately $2\,feet$ from the ileocecal valve, present in $2\%$ of the population.

Crohn's Disease (Regional Enteritis)

A recurrent granulomatous inflammatory disease involving the entire thickness of the bowel wall (terminal ileum and/or colon), characterized by a matted-loop pattern in late stages and absent or sluggish peristalsis.

Pediatric Gastrointestinal Lymphoma

The most common tumor of the gastrointestinal tract occurring in children younger than $10$ years of age.