Fibrous pseudotumor of paratesticular region is rare, but one of the most common neoplasm of that region. It has also been called as nodular fibrous proliferation, pseudofibromatous periorchitis, benign fibrous paratesticular tumor, and fibrous mesothelioma(pseudofibroma). We herein report a case of fibrous pseudotumor with characteristic histological findings. The patient is a 59 year-old male who had incidentally found scrotal mass and undergone radical orchiectomy. There was two separate nodules at tunica vaginalis and proximal spermatic cord which had bulging whitish-gray cut surface with focal myxoid change. Histologically, the mass was composed of dense collagenous tissue with scattered lymphoid follicles and numerous chronic inflammatory cells. There was a proliferation of spindle or stellate shaped cells, some of which featured enlarged hyperchromatic nuclei with prominent nucleoli, and abundant basophilic cytoplasm. These cells stained positive for vimentin and actin immunohistochemically, suggesting that this lesion might derive from proliferation of myofibroblasts.
Male ; Humans