During an assessment, which manifestation should a healthcare provider expect in an infant with pyloric stenosis?
Correct Answer: C
Rationale: Pyloric stenosis in infants typically presents with an olive-shaped mass in the upper abdomen due to hypertrophy of the pyloric muscle. This mass can often be palpated during an assessment and is a key characteristic of this condition. Bile-stained vomitus may be seen in conditions such as intestinal obstruction; a distended abdomen can be a nonspecific sign of various conditions, and painless, swollen joints are not typically associated with pyloric stenosis.