PMC8354374_01
Cluster nodules of small blister-like lymphatic malformation over the left side of the waist.
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Upon examination, we found that the patient had slight erythema on the left side of the waist, which presented as a smooth and loose blister cluster (Figure 1).
HE staining and methylrosanilinium chloride staining results. (a) A bulk of amorphous, acellular, and faintly eosinophilic material deposit the dermis (H&E, x100). (b) The infiltration of some plasma cells is shown (H&E, x200). (c) Methylrosanilinium chloride staining (x100).
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The dermis appeared as an amorphous aggregation (Figure 2a). A cell-like micro eosinophil was observed, which extended into the deep dermis and was surrounded by plasma cell infiltrates (Figure 2b). The results of methylammonium chloride staining showed purple staining (Figure 2c), consistent with the presentations of amyloid.
Kappa staining and Lambda staining results. (a) Kappa staining is positive. (b) Lambda staining is positive.
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In addition, both Kappa and Lambda stainings showed positive results (Figure 3).