PMC8325468_01
the right ventricular free wall showing ventricular wall thinning (green arrows) with marked fibrofatty replacement of the myocardium at the apex (black arrows), the papillary muscle (blue arrow) is also visible
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PMC8325468_01_PAMJ-38-404-g001.jpg
F1
However, at the distal third of the right ventricular free wall, that is, at the apical region, there was thinning of the wall (0.2 cm) with subtotal fibrofatty replacement of the myocardium (Figure 1).
histological section shows a focal transmural replacement of cardiac myocytes by fibroadipose tissue extending from the epicardium (blue arrows) to the endocardial surface (black arrows), an island of atrophic myocytes is seen floating in the fibroadipose matrix (yellow arrows), H&E X40
PAMJ-38-404-g002.jpg
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F2
Consequently, the myocardium showed at least 80-90% fat in-growth with focal transmural involvement (Figure 2).
Masson trichrome - stained section of the heart highlighting the fibrous tissue (blue strands), X400
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F3
Masson trichrome stain was done to highlight the fibrous tissue (Figure 3). Mild lymphocytic infiltrates were observed in parts (Figure 4).
histological section shows myocyte atrophy with mild lymphocyte infiltrate (blue arrows), H&E X400
PAMJ-38-404-g004.jpg
PMC8325468_01_PAMJ-38-404-g004.jpg
F4
Masson trichrome stain was done to highlight the fibrous tissue (Figure 3). Mild lymphocytic infiltrates were observed in parts (Figure 4).