Examkin

Soru

Zorluk: KolayInterpreting Imaging Results

A 65-year-old woman with a history of prior abdominal surgeries is admitted for suspected mechanical small bowel obstruction. If the condition remains unresolved and progresses to bowel ischemia and eventual perforation, arrange the following imaging findings in their typical chronological order of appearance on abdominal imaging.

  1. 1Dilated loops of small bowel with prominent valvulae conniventes
  2. 2Multiple prominent air-fluid levels on upright positioning
  3. 3Pneumatosis intestinalis (gas within the bowel wall)
  4. 4Free intraperitoneal air under the diaphragm

Cevap

The correct chronological progression is: Dilated loops of small bowel, followed by multiple air-fluid levels, then pneumatosis intestinalis, and finally free intraperitoneal air.
The pathophysiology of a worsening bowel obstruction dictates the imaging sequence. It begins with simple proximal dilation, progresses to stasis with air-fluid layering, worsens to wall ischemia (pneumatosis intestinalis), and culminates in transmural rupture yielding free intraperitoneal air.

Adım Adım Çözüm

1
Identify the earliest sign of mechanical obstruction.
Dilated loops of small bowel.
The immediate physical consequence of a blockage is upstream accumulation of gas and fluid, causing simple dilation.
2
Determine the effect of prolonged stasis within the dilated loops.
Multiple prominent air-fluid levels.
Over time, gravity separates the backed-up liquid and gas in the paralyzed, obstructed bowel segments.
3
Identify the initial radiographic sign of vascular compromise (strangulation).
Pneumatosis intestinalis.
Massive distension eventually cuts off venous and arterial flow, causing ischemic injury to the mucosa and allowing gas to enter the bowel wall.
4
Identify the terminal sign of irreversible bowel necrosis.
Free intraperitoneal air.
Once ischemia progresses to full-thickness transmural necrosis, the bowel wall ruptures, releasing air into the peritoneal cavity.

Anahtar Kavram

Radiographic progression of mechanical small bowel obstruction from simple obstruction to strangulation and perforation.
Tahmini Süre:45s
Bu soruyu puanla

Konular

Interpreting Imaging Results

Bu konudan daha fazla soru