Segmental arachnoiditis after posterior fossa operation: differentiation from metastatic tumor deposit.
A 16-year-old boy was noted to have an apparent intradural sacral mass 6 weeks after the excision of a 4th ventricle ependymoma. Although spinal axis radiation was considered, it was decided to make a definitive tissue diagnosis. At sacral laminectomy, only segmental arachnoiditis was found. The implications of this finding are the subject of this case report.
D000293:Adolescent; D001100:Arachnoiditis / Q000175:diagnosis* / Q000209:etiology; D002551:Cerebral Ventricle Neoplasms / Q000556:secondary / Q000601:surgery*; D003388:Cranial Fossa, Posterior; D003937:Diagnosis, Differential; D004806:Ependymoma / Q000556:secondary / Q000601:surgery*; D006801:Humans; D008297:Male; D009192:Myelography; D011183:Postoperative Complications; D013120:Spinal Cord Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging