Figure 5From: Paraneoplastic necrotizing myopathy associated with adenocarcinoma of the lung – a rare entity with atypical onset: a case report Vastus lateralis muscle biopsy. Necrotic fibers (*) with macrophage invasion show strong major histocompatibility complex (MHC)-I expression. Global MHC-I upregulation is very mild, with neoexpression on a limited subset of intact fibers (°). MHC-I: immunoperoxidase staining, ×200.Back to article page