Smoking exerts the strongest direct impact on the wound bed by compromising oxygen delivery and immune function. Nicotine causes vasoconstriction, reducing blood flow to the surgical site, while carbon monoxide from smoke lowers the amount of oxygen carried by red blood cells. The resulting tissue hypoxia hinders essential processes for wound healing—neutrophil killing of bacteria, collagen synthesis, and new blood vessel formation—leading to slower healing and a higher chance of infection. Although obesity, age, and sleep deprivation can influence infection risk, none affect the wound environment as profoundly as smoking does through these oxygenation and immune defects. Stopping smoking before surgery improves oxygen delivery and immune response, reducing postoperative infection risk.

Postoperative ileus happens mainly because the bowel’s propulsion is slowed by the combination of opioid use for pain control and the body’s response to surgical stress. Opioids bind to μ receptors in the enteric nervous system, which decreases acetylcholine release and dampens coordinated peristaltic contractions. This directly slows intestinal transit. At the same time, surgical manipulation of the gut triggers inflammation and increases sympathetic activity, further suppressing smooth muscle contractility and delaying movement of contents through the intestines. Together, these factors are the most common cause of a temporary ileus after surgery. Dehydration or electrolyte disturbances can worsen the situation, but they are not the primary driver in most patients. A mechanical obstruction presents with different signs (such as persistent severe pain, continuous vomiting, and no passage of gas or stool with abdominal x-ray findings suggesting blockage), rather than a generalized slowdown of motility.

The key idea is that an adrenal mass that is large and has lipid-poor features on imaging carries a high risk of malignancy, so it should be removed with oncologic principles rather than watched or biopsied. Lipid-poor adrenal lesions are more suspicious for adrenocortical carcinoma or metastatic disease than lipid-rich adenomas. At 8 cm, the mass size itself raises concern for malignancy, since larger adrenal tumors have a higher probability of cancer. Irregular borders add to the suspicion because they can reflect invasion or aggressive behavior. Percutaneous biopsy is not the right next step here because it often cannot reliably distinguish benign from malignant adrenal tumors and can carry risks such as bleeding or even tumor seeding along the needle tract. In the setting of a suspected malignancy, the management is typically surgical resection, not diagnosis by biopsy. Open adrenalectomy is favored in this scenario to achieve complete oncologic resection with intact margins and to allow thorough evaluation for invasion and regional lymphatics. While laparoscopic removal is appropriate for many benign lesions or smaller tumors without invasion, an 8 cm lesion with irregular borders and high attenuation strongly argues for an open approach to maximize oncologic control.

METs gauge how much energy the body uses during activity and serve as a practical measure of functional capacity in preoperative evaluation. Four METs roughly correspond to brisk walking, climbing a flight of stairs, or light cycling—activities most people can perform without symptoms. In surgical risk assessment, having a functional capacity of at least four METs is considered adequate, because it indicates sufficient physiologic reserve and is associated with a lower perioperative cardiac risk. If a patient can only perform activities under four METs, they may have limited cardiac reserve and could need further testing or optimization before surgery. Activities around six or eight METs show even greater exercise tolerance, but the threshold used to define adequacy is four METs. This is why four METs is the best-cutoff choice.