Endometriosis is a common disease, which affects 5-10% of women in fertile age 1 . It can affect multiple organs, such as ovaries, lungs, colon, nasal mucosa and brain 2 . Endometriosis of the sciatic nerve is a rare presentation 3 , manifesting as cyclic sciatica, parestesis and paresis with loss of deep tendon reflex. We cite a case of sciatica endometriosis and make a review of the literature. CASEA 26-year-old Caucasian woman exhibits intense pain and weakness in the lower left limb, which had progressed over the past nine years. She had no previous pregnancy and symptoms were worse during the menstrual period.During examination, a dorsiflexion paresis of the left foot was notable. Magnetic resonance imagining (MRI) revealed an expansive process in the left sciatic nerve topography at gluteal topography.The patient was referred for microsurgery, proceeding exeresis of a cystic lesion in the left sciatic nerve. Neuropathology analysis showed an endometrioma ( Figure). The patient had no complications during the post-operative period.During initial follow-up, dorsiflexion paresis in the left foot persisted. Post-operative MRI showed a cicatricial process, with no residual tumor. The eletroneuromiography (ENMG) displayed signs of a subacute denervatory process.

RESUMOEnxertos substituindo dura-máter são comumente aplicados em Neurocirurgia. O pericárdio bovino é considerado seguro e associado a raras complicações. Objetivamos mostrar caso de uma paciente com meningeoma do tubérculo selar, que apresentou uma complicação atípica após duroplastia utilizando pericárdio bovino para reconstrução da região fronto-temporal. Após dois dias de boa evolução pósoperatória, a paciente apresentou piora neurológica e a TC de crânio evidenciou hematoma intraparenquimatoso à direita, com edema peri-lesional, sendo necessária cirurgia para drenagem, e substituição do pericárdio bovino por enxerto de fáscia lata, com boa evolução pós-operatória. Pericrânio pediculado, fáscia temporal e fáscia lata constituem as mais efetivas e seguras escolhas para substituir dura-máter. Dentre os enxertos heterólogos e sintéticos utilizados, o pericárdio bovino é associado a poucas complicações. Todavia, intercorrências como reação inflamatória e infecção tem sido descritas relacionadas à substância glutaraldeído, presente neste enxerto. Palavras-chave: glutaraldeído, substituto dural, reação adversa, pericárdio bovino.ABSTRACT Dura mater grafts are commonly applied in neurosurgery. The bovine pericardium is safe and associated with rare complications. We report a case of a patient presenting with tuberculum sellae meningioma and unusual complication after frontotemporal duroplasty using bovine pericardium. After two days of good postoperative evolution, the patient presents with neurological worsening and CT scan shows intraparenchymal hematoma on the right, with perilesional edema, requiring surgery to drain and replace the pericardium of a fascia lata graft. with good postoperative evolution. Pediculated pericranium, temporal fascia and fascia lata are the most effective and safe choice to replace the dura mater. Among heterologous grafts, bovine pericardium is associated with few complications. However, complications such as inflammation and infection are related to the substance glutaraldehyde, present in such graft.

Spontaneous intra-aneurysmal thrombosis occurs in approximately 50% of giant intracranial aneurysms. The incidence of this process is associated to location, size, and origin, and the natural history of spontaneous thrombosis occurrence in non-giant aneurysms is rare and still unclear. We describe two non-giant middle cerebral artery (MCA) aneurysms that spontaneously thrombosed and comment the aspects of the literature.

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