Obstruction of the appendiceal lumen is the primary cause of appendicitis. Secondary to impacted fecal material or hyperplasia of the submucosal lymphoid follicles, associated with respiratory disease, infectious mononucleosis, and gastroenteritis.
Fecaliths result from the inspissation of fecal material and inorganic salts within the appendiceal lumen, are the most common causes of obstruction, and are present in 11-52% of patients with acute appendicitis.
- Non-compressible, blind ended tube arsing from the base of the cecum
- Outer diameter > 6 mm
- Target appearance
- Periappendiceal fluid
- Adjacent echogenic fat
- Blind ended tube arsing from the base of the cecum with outer diameter > 6 mm
- Periappendiceal fluid and stranding
Usually surgical, but if perforated with abcess, may choose IV antibiotics for 4-6 weeks followed by resection.