Mesothelial/monocytic incidental cardiac excrescence (MICE) is a very uncommon lesion. Diagnosis is incidental and may simulate thrombotic lesions. One of the hypotheses with regard to the etiology of this lesion is a previous cardiac procedure especially mitral valve repair or commissurotomy. Herein, we describe a MICE incidentally found in a patient who underwent mitral valve replacement, as a thrombotic lesion on the left atrial auricle. Histopathologic examination suggested MICE lesions and immunohistochemical stains confirmed it.
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From the archives of MD Anderson Cancer Center. Mesothelial/monocytic incidental cardiac excrescence with a review of the literature.
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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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Department of Pathology and Laboratory Medicine, Loyola University Medical Center, Maywood, USA.
Nodular histiocytic/mesothelial hyperplasia (NHMH) is a rare histologic entity, characterized by localized benign reactive proliferation of histiocytes and mesothelial cells. The presence of this rare entity poses a challenge in differential diagnosis, both in radiological findings and pathological interpretations under certain circumstances, and consequently has been misdiagnosed as malignancy. Here, we report a case of mesenteric NHMH in a patient with colonic mucinous adenocarcinoma.
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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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