Fig. 5

a−c Histological section of fish pseudobranch of control untreated group showing; a Massive destruction of bony tissue and muscle fiber with intense inflammatory cells infiltration (×100). b Compact fibrous bundles of the cyst wall (×200) c Intense EGCs infiltration mixed with mononuclear cells in the adipose tissue that incorporated in the structure of cyst wall (×200). d–f Histological section of fish pseudobranch of treated group showing, d histologically normal of pseudobranch bony structures and muscle bundles with few EGCs infiltrating the underlying adipose tissue (×100). e Depression of fibrous bundles of cyst wall with minim al reaction od of the adjacent host adipose tissue(×100).f massive dispersions and edema of the cyst wall fibrous structure with degranulation of EGCs (×400)