Libman-Sacks endocarditis is associated with antiphospholipid antibody syndrome and SLE. Which cardiac valvular pathology pattern distinguishes Libman-Sacks from rheumatic endocarditis and infective endocarditis?

• A Libman-Sacks produces large, destructive vegetations on the ventricular surface of the mitral valve leaflet tips, with abscess formation and valve perforation
• B Libman-Sacks produces large, friable vegetations at the anterior leaflet tip, exclusively on the atrial surface, similar to rheumatic McCallum's patch
• C Libman-Sacks produces only fibrous thickening of valve commissures without surface vegetations, causing pure mitral stenosis
• D Libman-Sacks produces small, flat, irregular sterile vegetations on both surfaces (atrial and ventricular) of the mitral valve leaflets, often along the line of closure and at the posterior leaflet; it causes both stenosis and regurgitation and lacks abscess formation ✓

Explanation

Libman-Sacks endocarditis produces small (1-4 mm), irregular, flat, tan-brown sterile vegetations that characteristically occur on BOTH the atrial and ventricular surfaces of valve leaflets — this bilateral surface involvement distinguishes it from other endocarditis types. It most commonly affects the mitral valve, especially the posterior leaflet and chordae. Rheumatic endocarditis produces verrucous (warty) vegetations along the line of valve closure on the atrial surface only. Infective endocarditis produces large, irregular, destructive vegetations on the atrial surface of AV valves. NBTE (marantic endocarditis) produces small, sterile vegetations along the line of closure on the atrial surface only, and is associated with malignancy and cachexia.

Reference: Robbins & Cotran Pathologic Basis of Disease, 10th ed.

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