Mesothelial/monocytic incidental cardiac excrescence

Area of Science:

• Cardiovascular Pathology
• Surgical Pathology

Background:

• Mesothelial/monocytic incidental cardiac excrescence (MICE) is an exceptionally rare cardiac lesion.
• MICE diagnosis is often incidental and can be misdiagnosed as thrombotic lesions.
• Previous cardiac procedures, particularly mitral valve interventions, are hypothesized as potential causes.

Observation:

• This report details a MICE case discovered incidentally in a patient post-mitral valve replacement.
• The lesion was initially identified as a thrombotic lesion on the left atrial auricle.
• Histopathological examination and immunohistochemical staining were crucial for definitive diagnosis.

Findings:

• Histopathology suggested MICE, which was confirmed by immunohistochemical analysis.
• The findings highlight the importance of differential diagnosis in cardiac lesions post-surgery.
• This case expands the understanding of MICE presentation and etiology.

Implications:

• Accurate identification of MICE is crucial to avoid misdiagnosis and unnecessary interventions.
• The case supports the hypothesis linking MICE to prior cardiac surgical procedures.
• Further research into MICE etiology and clinical significance is warranted.