A 42-year-old man presents to the emergency department with a 5-day history of worsening r… — USMLE Step 2 CK

A 42-year-old man presents to the emergency department with a 5-day history of worsening right lower quadrant abdominal pain, chills, and anorexia. His temperature is $38.8^\circ\text{C}$ ( $101.8^\circ\text{F}$ ), blood pressure is $112/74\text{ mmHg}$ , and heart rate is $108/\text{min}$ . On physical examination, the abdomen is non-distended. There is a palpable, tender mass in the right lower quadrant with localized guarding, but no diffuse rebound tenderness. Laboratory studies show a leukocyte count of $18,000/\text{mm}^3$ with $85\%$ neutrophils. Arrange the following management steps in the most appropriate chronological sequence for this patient.

1Initiation of intravenous fluid resuscitation and broad-spectrum antibiotics
2Computed tomography (CT) scan of the abdomen and pelvis with contrast
3Percutaneous image-guided drainage of the intra-abdominal collection
4Interval appendectomy as an elective procedure

Cevap

The correct sequence is: Initiation of intravenous fluid resuscitation and broad-spectrum antibiotics, followed by a Computed tomography (CT) scan of the abdomen and pelvis with contrast, then Percutaneous image-guided drainage of the intra-abdominal collection, and finally an Interval appendectomy as an elective procedure.

This patient's presentation (5 days of symptoms, fever, leukocytosis, and a palpable RLQ mass) is highly suggestive of complicated appendicitis with abscess or phlegmon formation. Immediate surgical intervention in this setting is associated with a significantly increased risk of extensive bowel resection and surgical site infections due to severe surrounding inflammation. Therefore, the standard algorithmic approach is to first stabilize the patient medically with intravenous fluids and broad-spectrum antibiotics. Once stabilized, a CT scan of the abdomen and pelvis is essential to define the anatomy and differentiate an abscess from a phlegmon. Because the clinical presentation strongly points to an abscess, percutaneous image-guided drainage is the next logical step to achieve source control safely. Finally, after the patient has recovered and the acute inflammation has subsided (typically 6-8 weeks), an interval appendectomy is performed to prevent recurrent appendicitis and exclude an underlying appendiceal neoplasm.

Adım Adım Çözüm

Recognize the clinical presentation of late-presenting complicated appendicitis.

The palpable mass and duration of symptoms suggest an appendiceal abscess or phlegmon.

Immediate surgical exploration in late-presenting appendicitis with an inflammatory mass has a high risk of bowel injury.

Prioritize initial medical stabilization.

Identify intravenous fluid resuscitation and broad-spectrum antibiotics as the first step.

The patient has signs of a systemic inflammatory response, requiring prompt medical therapy prior to imaging.

Select the appropriate diagnostic imaging.

Identify CT scan of the abdomen and pelvis as the second step.

Imaging is necessary to differentiate between a phlegmon (treated with antibiotics alone) and a discrete abscess (requiring drainage).

Determine the procedural management based on imaging.

Identify percutaneous image-guided drainage as the third step.

CT-guided drainage is the standard of care for a well-defined appendiceal abscess to achieve source control.

Plan long-term definitive management.

Identify interval appendectomy as the final step.

Once inflammation resolves over 6 to 8 weeks, interval appendectomy is recommended to prevent recurrence and rule out underlying neoplasms.

Anahtar Kavram

Management algorithm for complicated appendicitis with a palpable inflammatory mass

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