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[Hepatobiliary scintigraphy using 99m Tc-DISIDA and obstructive cholangiopathy in children]
Insights
Technetium 99m-labeled diisopropyl iminodiacetic acid (99m Tc-DISIDA) hepatobiliary scintigraphy shows relative sensitivity and specificity in diagnosing infantile obstructive cholangiopathy, particularly biliary atresia. This diagnostic imaging remains crucial despite some false negatives.
Area of Science:
- Pediatric Gastroenterology
- Nuclear Medicine
- Diagnostic Imaging
Background:
- Infantile obstructive cholangiopathy is a critical condition requiring early diagnosis.
- Accurate differentiation between biliary atresia and neonatal hepatitis is essential for timely intervention.
Purpose of the Study:
- To retrospectively evaluate the diagnostic performance of 99m Tc-DISIDA hepatobiliary scintigraphy in infantile obstructive cholangiopathy.
- To assess the effectiveness of two distinct sets of criteria for identifying biliary atresia.
Main Methods:
- Retrospective analysis of 26 patients with pathologically proven infantile obstructive cholangiopathy.
- Utilized 99m Tc-DISIDA hepatobiliary scintigraphy.
- Evaluated two types of diagnostic criteria: Type 1 (hepatocyte clearance, transit time, intestinal activity) and Type 2 (intestinal radioactivity at 24 hours, birth weight).
Main Results:
- Type 1 criteria yielded high sensitivity (88.2%) and specificity (88.9%) for biliary atresia.
- Type 2 criteria demonstrated identical performance for biliary atresia detection (Sensitivity 88.2%, Specificity 88.9%).
- Lower parameters were observed for neonatal hepatitis using Type 1 criteria.
Conclusions:
- 99m Tc-DISIDA hepatobiliary scintigraphy, using both evaluated criteria sets, is a relatively sensitive and specific tool for detecting biliary atresia in infants.
- Despite potential for false negatives, the study underscores its importance as a diagnostic test for biliary atresia.
Abstract:
Technetium 99m-labeled diisopropyl iminodiacetic acid (99m Tc-DISIDA) hepatobiliary scintigraphy of 26 patients with pathologically proven infantile obstructive cholangiopathy are retrospectively studied according to two types of criteria. Those of type 1 consider 1) hepatocyte clearance 2) hepatobiliary transit time and 3) visualisation of intestinal activity. For biliary atresia, sensitivity of 88.2%, specificity of 88.9%, positive predictive value of 93.8% and negative predictive value of 80.0% were obtained. For neonatal hepatitis, those parameters were 57.1%, 94.7%, 80.0% and 85.7% respectively. Criteria of type 2 identify only biliary atresia. They consider 1) presence or absence of intestinal radioactivity through 24 hours and 2) birth weight. Sensitivity, specificity, positive and negative predictive values were 88.2%, 88.9%, 93.8% and 80.0% respectively. Even if all these values are inferior to many reported in literature, we consider that the two types of criteria are relatively sensitive and specific to detect biliary atresia. Even through there are a few false negatives, biliary scintigraphy does remain one of the most important diagnostic tests in the context of biliary atresia.