ArticleAbdominal radiology (New York)2026
Hypervascular solid-appearing serous cystadenoma as a mimic of nonfunctioning pancreatic neuroendocrine tumour: a systematic review.
Article in Abdominal radiology (New York), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundSolid pancreatic serous cystadenoma (SCA) may present as a hypervascular mass and mimic nonfunctioning pancreatic neuroendocrine tumour (NF-pNET), potentially leading to pancreatic resection for benign disease. We synthesized the available evidence on this diagnostic pitfall.
methodsA PRISMA 2020-aligned systematic review searched MEDLINE, Embase, and Web of Science (1 January 2000-1 December 2025). We included comparative cohorts of pathology-proven SCA versus NF-pNET reporting CT/MRI discriminative features and case reports/series of pathology-proven SCA preoperatively interpreted as NF-pNET. Comparative cohorts and case reports/series were synthesized separately; no meta-analysis was performed.
resultsThirty-five publications were included: four retrospective single-center comparative cohorts (50 SCA and 89 NF-pNET patients) and 31 case reports/series (39 SCA patients). In comparative cohorts, unenhanced CT attenuation was consistently lower in SCA than in NF-pNET (18.5-29.6 vs. 38.8-48.4 HU), with study-specific ROC-derived cutoffs in the low 30-HU range; attenuation ratios performed similarly. Diffusion-weighted MRI showed higher ADC values in SCA, with reported study-specific cutoffs of > 1.36 × 10
conclusionsNF-pNET-mimicking SCA is an uncommon but clinically consequential benign mimic. In the available retrospective comparative cohorts of resected, pathology-proven lesions, lower unenhanced CT attenuation (and attenuation ratios) and higher DWI-ADC values consistently favored SCA over NF-pNET, whereas arterial hyperenhancement and positive somatostatin receptor imaging uptake were not specific. These findings may support cautious multiparametric assessment in selected hypervascular solid-appearing pancreatic lesions, but should not be applied as definitive diagnostic thresholds without external validation.
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