A 42-year-old woman presents to the emergency department with severe right upper quadrant abdominal pain, fever, and nausea. Acute cholecystitis is highly suspected. Arrange the following imaging modalities in the correct step-wise sequence for evaluating this patient, beginning with the most appropriate initial test, followed by the test used when the initial evaluation is indeterminate, and concluding with the modality reserved for assessing severe complications or alternative diagnoses.
- 1Right upper quadrant transabdominal ultrasound
- 2Hepatobiliary iminodiacetic acid (HIDA) scan
- 3Computed tomography (CT) scan of the abdomen with intravenous contrast
Cevap
The correct sequence is to perform a Right upper quadrant transabdominal ultrasound first, followed by a Hepatobiliary iminodiacetic acid (HIDA) scan if the initial imaging is equivocal, and to reserve a Computed tomography (CT) scan of the abdomen with intravenous contrast for assessing potential complications.
The correct ordering strictly follows the standard diagnostic algorithm for acute cholecystitis. Ultrasound is the first-line test due to its safety, availability, and high sensitivity for detecting gallstones. If the ultrasound is non-diagnostic, a HIDA scan is indicated to confirm cystic duct obstruction. Finally, a CT scan is reserved for clinical scenarios where complications like an abscess or perforation are suspected, or to rule out other intra-abdominal emergencies.
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Anahtar Kavram
The step-wise diagnostic imaging algorithm for acute cholecystitis prioritizes ultrasound as the initial test, utilizes cholescintigraphy for indeterminate cases, and reserves CT scanning for suspected complications.