Myoblastoma of the bladder neck: report of a case.

SUMMARY We have observed a case of myoblastoma in the bladder neck in a 66-year-old man who was referred for urological examination for pyuria and haematuria. Cystoscopy revealed an ulcer of unusual appearance in the bladder neck. The ulcer and surrounding tissue were removed by transurethral resection with McCarthy's apparatus. The histological examination revealed myoblastoma. No signs of metastases were found on X-ray examination of the lumbar spine, pelvis, and lungs. The patient is symptom-free and there are no signs of recurrence. As far as can be seen, this is the first published report of a benign myoblastoma in this region. It is important to have this diagnosis in mind in cases of unusual alterations in the bladder neck, and also for the histological diagnosis so that the case is not interpreted as cancer and incorrectly treated with radiotherapy which has no effect on myoblastomas. Horn and Stout (1943) report a case from the tongue which was treated with radium. They write: “This case provides evidence of the marked radio-resistance of this type of neoplasm, since the tumour survived a sufficient dosage of radium to produce necrosis of the tongue.”