[Sub-peritoneal schwannoma (author's transl)]

The authors report a rare case of sub-peritoneal malignant schwannoma developing 5 years after excision of a schwannoma of the sigmoid. The non-excised tumour compressed the bladder and one ureter. This type of tumour, extremely rare, accounts for less than 2% of tumours. Arising in the cells of the Schwann sheath, and as a general rule developing in the central nervous system, peripheral nerves of the neck, mediastinum, flexor surfaces of the extremities or nerves of the digestive tract, they may be benign tumours do not recur. The example reported here showed that this distinction is in no way absolute.