Image-Guided Percutaneous Omental and Mesenteric Biopsy: Assessment of Technical Success Rate and Diagnostic Yield.

PURPOSE: To assess biopsy technique, technical success rate, and diagnostic yield of image-guided percutaneous biopsy of omental and mesenteric lesions.

MATERIALS AND METHODS: This retrospective study included 186 patients (89 men, 97 women; mean [SD] age, 63 [13.8] y) who underwent percutaneous image-guided biopsy of omentum and mesentery between March 2007 and August 2015. Biopsies were performed with computed tomography (CT) (n = 172) or ultrasound (US) (n = 14) guidance using coaxial technique yielding core and fine-needle aspiration (FNA) specimens. Biopsy results were classified as diagnostic (neoplastic or nonneoplastic) or nondiagnostic based on histopathology and cytology. Technical success rate and diagnostic yield of omental and mesenteric lesions were calculated.

RESULTS: There were 186 image-guided percutaneous biopsies of omental (n = 95) and mesenteric (n = 91) lesions performed. Technical success rate was 99.5% for all biopsies, 100% for omental biopsies, and 98.9% for mesenteric biopsies. Overall sensitivity was 95.5%, specificity was 100%, negative predictive value was 78.3%, and positive predictive value was 100%, which was comparable for omental and mesenteric biopsies. Core biopsies had higher diagnostic yields compared with FNA: 98.4% versus 84% overall, 99% versus 88% for omental biopsies, and 97.7% versus 80% for mesenteric biopsies. Spearman rank correlation showed no correlation between lesion size and diagnostic yield (P = .14) and lesion depth and diagnostic yield (P = .29) for both groups. There were 5 complications.

CONCLUSIONS: Image-guided percutaneous omental and mesenteric biopsies have high technical success rates and diagnostic yield regardless of lesion size or depth from the skin for both omental and mesenteric specimens.