Measurement error in CT assessment of appendix diameter

WITHDRAWN: Endoscopic intervention for acute appendicitis: retrospective study of 101 cases

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Accuracy of Ex Vivo Semiautomatic Segmentation of Urinary Stone Size in Computed Tomography Compared With Manual Size Estimation in Radiographic Correlation

OBJECTIVE

To evaluate the accuracy of semiautomated segmentation of urinary stone size in computed tomography (CT) compared with manual measurement.

MATERIALS AND METHODS

A total of 103 patients (32f, 71m ; mean age 52 years±18 that were diagnosed with urolithiasis and collected stones received standardized ex vivo CT-scans and radiography of the stones. Stone size was segmented semiautomatically using commercial software (syngo.via, Siemens, Germany) and compared with manual caliper measurement on digital radiography.

RESULTS

Mean size was 4.4 mm in CT and 4.6 mm in radiography. Depending on number of stones analyzed per patient, estimation of stone size showed moderate to excellent correlation for both methods. There was no significant difference in overall size measurement.

CONCLUSION

Semiautomatic segmentation of urinary stone size in CT is possible and reduces measurement errors, allowing more precise estimation especially for smaller concrements. Neighboring stones may hamper segmentation of stone size.

Pediatric scrotal ultrasound: review and update

In this pictorial essay the authors review the normal sonographic gray-scale and Doppler appearance of the pediatric scrotum with an emphasis on technique. The authors present an update on ultrasound diagnosis and outcomes in testicular torsion and differentiation from other acute scrotal processes, as well as sonographic imaging of testicular microlithiasis and uncommon or atypical scrotal masses including splenogonadal fusion, polyorchidism, meconium peritonitis and epidermoid cyst. Further, the authors discuss testicular neoplasms in the context of testicular microlithiasis.