Mesothelial/monocytic incidental cardiac excrescence (MICE) is a benign lesion composed of histiocytes and mesothelial cells, usually found during cardiac surgery. To date, no more than 50 cases are reported in literature, and pathogenesis is still unclear even if different theories have been proposed. Here we report a case of MICE encountered during aortic valve replacement with typical histological features and extensive immunohistochemical investigation. To date, little information is available about the pathogenesis of MICE. We review the current literature focusing on the role of adhesion molecules such as CD31.
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From the archives of MD Anderson Cancer Center. Mesothelial/monocytic incidental cardiac excrescence with a review of the literature.
Ann Diagn Pathol
August 2024
Department of Pathology, University of Texas Medical Branch, Galveston, TX, United States of America; The University of Texas MD Anderson Cancer Center, Houston, TX, United States of America. Electronic address:
Mesothelial/monocytic incidental cardiac excrescence (MICE) is a rare benign lesion composed of monocytes and mesothelial cells that is most often encountered during cardiothoracic surgery. We describe a case in a 71-year-old man with known aortic valve stenosis who presented with gradual onset dyspnea over a few weeks, made worse with minimal exertion. A transesophageal echocardiogram revealed severe aortic stenosis and mild pericardial effusion.
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Division of Cardiac Surgery, IRCCS San Raffaele Scientific Institute, Milan, Italy.
Mesothelial or monocytic incidental cardiac excrescence (MICE) is a rare, benign lesion composed of a mixture of mesothelial and inflammatory cells, histiocytes and fibrin without a vascular network usually accidentally found during cardiac surgery or after cardiac catherization. We report the case of a 45-year-old man admitted for suspected myxoma on the mitral valve. The lesion was removed via a minimally invasive video-assisted approach, without compromising the valve competency.
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Department of Cardiac Surgery, University of Verona, Verona, Italy.
Mesothelial/monocytic incidental cardiac excrescence (MICE) is a rare benign finding made of mesothelial cells, histiocytes, and fibrin, usually found during heart valve surgery. The clinical relevance resides in the potential misdiagnosis as metastatic carcinoma or arterial embolism. The pathogenesis remains uncertain, with artifactual and reactive hypotheses.
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