In a patient with lower left quadrant pain and fever, which diagnosis is the most likely?

• A. Appendicitis
• B. Diverticulitis
• C. Ovarian cyst rupture
• D. Pancreatitis

Answer: (B)

The presentation of lower left quadrant pain and fever is highly suggestive of diverticulitis. This condition arises when diverticula, small pouches that can form in the walls of the colon due to increased pressure, become inflamed or infected. The most common site for diverticulitis to occur is in the sigmoid colon, which is located in the lower left quadrant of the abdomen.

Symptoms such as localized abdominal pain, fever, and changes in bowel habits accompany diverticulitis. The inflammation can also lead to complications including perforation, abscess formation, or obstruction, especially if not identified and treated promptly.

While appendicitis could present with left lower quadrant pain in specific cases (like in situs inversus or in some anatomical variants), it typically presents in the right lower quadrant. Ovarian cyst rupture usually causes acute pelvic pain, potentially with referred pain to various abdominal regions, but fever is not a common accompaniment unless there's secondary infection. Pancreatitis typically implies epigastric or mid-abdominal pain that can radiate to the back, and also usually involves elevated serum lipase or amylase levels.

Thus, the symptoms and clinical picture fit most closely with diverticulitis, making it the most likely diagnosis in this scenario.