Histopathological images of the resected specimen. Image (a) demonstrates extensive hemorrhagic soft tissue (low power, H&E). Image (b) shows cyst wall lined by cuboidal epithelium (high power, H&E). Image (c) demonstrates smooth muscle in the cyst wall after immunohistochemical staining with smooth muscle actin (medium power, SMA). Image (d) demonstrates positive nuclear immunostaining with PAX-8 (medium power, PAX-8).