[A massive bone metastasis of prostatic origin (author's transl)].

The authors report the case of a 68 year old man with histologically proven cancer of the prostate who progressively developed an ischioperineal tumor interfering with sitting, and in the pelvis x-ray it was ovular measuring 16 X 7.5 cm. This bone tumor, developed at the expense of the right ischeopublic ramus and the ischeal tuberosity, was well limited and circumscribed, with its central portion dense and the periphery giving a septate appearance. The biopsy of the tumor done under a brilliance amplifier showed that it was an osteosclerotic metastasis of an adenocarcinoma. It appears exceptional for a prostatic cancer metastasis to occur in such an expansive and massive form.