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Background: Plasma cell neoplasms are characterized by the neoplastic proliferation of a single clone of plasma cells. Solitary plasmacytomas most often occur in bone, but they can also be found in soft tissues. Case Description: A 53-year-old male presented with localized sacral pain and urinary incontinence. His radiographic studies showed a solitary sacral plasmacytoma (i.e., involving the bone). He was successfully managed with high-dose dexamethasone and microwave ablation (MWA). Conclusion: Plasmacytomas of bone can be occasionally successfully managed with MWA, adjuvant cytoreduction therapy, and high doses of dexamethasone.

Objectives: Present our experience in the treatment of complex hydrocephalus with the use of ultrasonografic guide. Methods: We achieve diagnosis of complex hydrocephalus in thirty-one patients by TC and RM images techniques. It was included different etiological entities that conditioned this problem like tumors, arachnoid cyst, neuroinfection were the most common observed in our study. These patients were operated by different approaches: microsurgical and endoscopic approach, alone or in combination. In all of cases, we make a transoperative sonographic exploration, which allow real-time navigation to localize lesions, corroborate resection, identify vascular features of lesions, guide endoscopic exploration and guide ventricular devices. We performed postoperative ultrasonography to prove objectives preoperative. Which are corroborated by image techniques TC or RM.Results: Thirty-one patients were operated using sonographic guide, twenty-one patients with hydrocephalus diagnosis (67% of total cases), eleven with multiloculate hydrocephalus (35%), ten with hydrocephalus in which there is ventricular system segment isolate (32%). Seven patients with arachnoid cyst (22.5%), three brain tumors (9.6%) Conclusions: We presented our experience in the treatment of unusual hydrocephalus in which microsurgery and endoscopic combination assisted by transoperative ultrasonography allow the possibility to solve CSF accumulation in complex cases. Transoperative ultrasonography offers value information. It is reproducible, cheap and accessible to most of hospitals, becoming a value tool, mainly in developing countries.