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© BMJ Publishing Group Limited 2023. No commercial reuse. See rights and permissions. Published by BMJ. DESCRIPTION A male in his 80s was found incidentally to have a large mass in the right ventricle (RV) noted on CT imaging. This mass was further characterised with echocardiography, dedicated cardiac CT (figure 1AB) and cardiovascular magnetic resonance (CMR) imaging (figure 1C–F). The patient had a known diagnosis of Gorlin syndrome (GS) and was under routine dermatology followup. He met clinical diagnostic criteria for GS in the fact that he has had over 100 basal cell carcinomas (BCCs) removed since 1997, facial congenital malformation (otopalatodigital syndrome), prognathism and increased head circumference. The clinical impression, given his underlying diagnosis of GS, following multimodality imaging, was that the mass represented a benign cardiac fibroma. The patient had no symptoms of cardiac failure. The cardiac mass was not clearly visualised on transthoracic echocardiography; however, there were no features of RV dysfunction. Dedicated cardiac CT imaging demonstrated a large, 53×37 mm, wellcircumscribed, partially calcified mass within the RVfree wall which was poorly perfused (noncontrast study, figure 1A, and contrast enhanced, figure 1B). CMR confirmed a welldefined mass (cine, figure 1C) that was isointense on T1weighted imaging (figure 1D) and hypointense on T2weighted imaging (figure 1E). There was minimal enhancement on first pass perfusion imaging but extensive, heterogeneous late gadolinium enhancement (figure 1F). GS, also termed nevoid BCC syndrome, is a rare hereditary condition characterised by early development of BCCs, odontogenic jaw keratocysts and musculoskeletal abnormalities. The prevalence of GS is estimated to be approximately 1 in 30 000 people in the UK. GS is inherited in an autosomal dominant fashion; it is caused by a mutation in the tumour suppression patched 1 (PTCH1) gene leading to increased tumour development. The rate of cardiac fibroma formation in patients with GS is 3%. Current guidance states that screening echocardiography should be performed in young patients diagnosed with GS given the risk of cardiac fibroma formation. Management of cardiac fibromas requires a multidisciplinary specialist approach, in children and younger patients surgical resection or cardiac transplant are considered. Current European Society of Cardiology guidance stipulates that surgical resection must be considered regardless of symptoms given the risk of arrhythmia or possible impedance of ventricular outflow. We demonstrate that, in a rare case of cardiac fibroma detection in an older patient with GS, a conservative approach involving surveillance with dedicated CMR was sufficient as opposed to consideration of surgical intervention. In the 4 years of surveillance Figure 1 Multimodality imaging in the patient with a cardiac fibroma secondary to Gorlin syndrome