Isolated penis schwannoma: A rare case report
The present case report has been published in the journal Urology Case Reports.

A 39-year-old man presented with a small mass on the veutro of his penis. He did not suffer from urinary tract infection, hematuria, odynuria, and hematospermia. Erection was normal. He discovered it 3 months ago. The doctor suggested he receive the surgery, but he refused. Now, he found that the mass increased gradually and required surgical resection.

He had a history of appendectomy in 22 years ago. He had no history of the neurinoma of the spinal cord. Physical examination revealed solid mass on the veutro aspect of the penis and located on the middle ridge between the corpus cavernosum and corpus spongiosum. The mass was the size of a peanut, border clear and no tenderness. Laboratory test and urine analysis were normal.

The mass was completely surgical resection. No invasion of the corpus cavernosa and corpus spongiosum penis was found in operation. The patient recovered well with no complications.

Histologically, the mass size about 1.2 * 1.1 cm was grey section, encapsulated by fibrous capsule (Fig. 1a), and was composed of bundles of spindle-shaped cells and ovoid cells. The cells did not see obvious atypia, a small number of nuclei increased. Nuclear fission cannot be noted. Immunohistochemical staining indicated S100 was positive, desmin, smooth muscle actin and CD34 were negative. Ki67 was less than 2%.

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