von Hippel-Lindau disease-associated solid microcystic serous adenomas masquerading as pancreatic neuroendocrine neoplasms
ABSTRACT BACKGROUND: Patients with von Hippel-Lindau disease (VHL) commonly develop pancreatic cysts and neuroendocrine neoplasms (PNENs or PNETs). Solid microcystic serous adenoma (SMSA), a rare neoplasm described in VHL patients, can be mistaken for PNEN on imaging. METHODS: Clinical, pathologic, and radiologic data were reviewed on VHL patients who underwent surgery for a preoperative diagnosis of PNEN since 1994 at 1 institution. Blinded to the pathologic diagnoses, radiologists reassessed available imaging. RESULTS: For 55 patients, 79 pancreatectomies were performed for presumed PNENs. Ten (18%) patients underwent 12 (15%) resections for neoplasms diagnosed as SMSA on final pathology. The average size of a SMSA leading to operation was 3.6 ± 0.4 cm. Four out of 11 SMSAs were still mistaken for PNENs when imaging was reassessed. The mean FDG-positron emission tomography (PET) standardized uptake value was greater for 17 PNENs (12.1 ± 1.2) compared with 6 SMSAs (4.2 ± 0.5; P = .002). The mean doubling time of SMSAs and PNENs was similar. Seven (15%) patients with pathologically proven PNENs had malignant disease. CONCLUSION: SMSAs can mimic PNENs on nonfunctional imaging; FDG-PET may help to differentiate them. A high index of suspicion is needed to minimize operations performed for SMSA and to counsel VHL patients of their risks of undergoing operation for a lesion with no known malignant potential.
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ABSTRACT: Background. von Hippel–Lindau (VHL) disease is an autosomal dominant disorder characterized by the development of multiple tumors in the central nervous system and visceral organs. In this study, we describe clinical features of pancreatic involvement in VHL disease, of which there have been few reported studies to date. Methods. We reviewed medical records of 63 VHL patients, diagnosed at Asan Medical Center between January 1995 and December 2013. Demographic, genetic, and radiologic features, and the clinical course of VHL patients with pancreatic involvement were retrospectively analyzed. Results. Among the 63 VHL patients, 55 (87.4%) had VHL-associated pancreatic lesions (male: female, 31:24; median age at onset, 33 years; range, 12–67 years). These presented as single simple cysts (n = 5, 9.1%), multiple simple cysts (n = 14, 25.5%), serous cystadenoma (n = 29, 52.7%), or neuroendocrine tumors (NETs) (n = 17, 30.9%). Genetic tests were performed on 35 of the 55 patients (63.6%) and VHL gene mutations were observed in 28 of them (80%). Of the 55 patients, 11 received surgical treatment, 2 received endoscopic ultrasonography-guided ethanol ablation therapy as local treatment for NET, and 42 patients were followed regularly without intervention (20%, 3.6%, and 76.4%, respectively). Conclusion. Pancreatic involvement in VHL disease is common, with a prevalence of 87.4%. Serial screening imaging studies for the early detection of VHL-associated NET are necessary in individuals at risk of VHL disease. A large-scale epidemiological study of VHL disease is needed to examine the natural course of the disease and the prognosis for pancreatic involvement.Scandinavian Journal of Gastroenterology 01/2015; 50(3). DOI:10.3109/00365521.2014.992364 · 2.33 Impact Factor