This retrospective observational study examines whether abdominal circumference is associated with operative time in patients undergoing retroperitoneal adrenalectomy for pheochromocytoma. Data were collected from medical records of patients treated at a single tertiary referral center. The primary outcome is operative time, measured in minutes. The purpose of this study is to evaluate whether abdominal circumference can serve as a practical predictor of operative difficulty in retroperitoneal adrenalectomy.

Inclusion Criteria:

• Adult patients diagnosed with pheochromocytoma
• Patients who underwent retroperitoneal adrenalectomy
• Availability of complete operative records

Exclusion Criteria:

• Patients younger than 18 years
• Patients who underwent transperitoneal adrenalectomy
• Incomplete clinical or operative data

The study population consists of adult patients diagnosed with pheochromocytoma who underwent retroperitoneal adrenalectomy at a single tertiary referral center. Data were collected retrospectively from electronic medical records.