[A case of lipomatous tumor arising from the paratesticular lesion].

We encountered a case of lipomatous tumor in the left scrotum, which was clinically and radiologically quite similar to an inguinal hernia. A 75-year-old male patient visited a nearby hospital complaining of a painless left scrotal swelling. Palpation revealed an elastic firm mass 5 cm in diameter in the left scrotum. The tumor marker levels were within the normal range. The patient was referred to our hospital for further evaluation. A preoperative diagnosis of inguinal hernia containing the omentum was made. Although a solid mass was demonstrated in the scrotum, no inguinal hernia was found at the operation. Therefore, a left high inguinal orchiectomy was performed. Microscopically, most of the tumor consisted of mature adipocytes, some of which had different cellular sizes. Scattered lipoblasts and atypical mesenchymal spindle cells were also observed, suggesting potential malignancy. (