520 Journal of Neurology, Neurosurgery, and Psychiatry 1991;54:520-523 Partial, non-thrombotic, superior sagittal sinus J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.54.6.520 on 1 June 1991. Downloaded from occlusion due to occipital skull tumours G T Plant, J J Donald, A Jackowski, S J Vinnicombe, B E Kendall Abstract signs on neurological examination. Visual Two cases are described in which raised acuity was 6/6 bilaterally and the blind spots intracranial pressure occurred as a enlarged on visual field testing. A CT brain result of superior sagittal sinus (SSS) scan was carried out but neither enlargement occlusion by an occipital skull tumour. of the ventricular system nor a mass lesion One was a plasmacytoma, the other a were found and the scan was at first considered metastatic deposit from a Ewing's sar- to show no abnormality. CSF examination coma. The difficulties in diagnosis of revealed an opening pressure of greater than this syndrome are illustrated together 40 cm of CSF. The protein content was with the importance and success of 0 26 g/L and the glucose 5 5 mmol/L with no appropriate treatment. From the increase in cellularity and no malignant cells literature it appears possible that these seen on cytological examination. He was fol- two tumours may be particularly likely lowed for a further four weeks during which to occlude the SSS and the reasons for time he began to notice loss of vision. On this are discussed. examination he then showed constriction of visual fields and he was admitted for further investigation. A further CT brain scan Superior sagittal sinus (SSS) thrombosis is a showed midline destruction of the occipital well recognised cause of raised intracranial bone with an associated soft tissue mass (fig pressure. Less attention has been paid to the IA). In retrospect this lesion had been visible, fact that midline tumours in the occipital although considerably less obvious, on the first region of the skull can give rise to raised CT scan. A digital subtraction angiogram intracranial pressure secondary to non-throm- (DSA) showed in the venous phase partial botic compressive occlusion of dural venous occlusion of the SSS with an adjacent sinuses. The purpose of this article is to report "tumour blush" (fig 1B). two such cases illustrating the difficulties in He was treated with 20 gy to the whole making the diagnosis if the possibility is not brain in five fractions with steroid cover. Over actively considered. The importance of recog- two weeks there was further visual loss and his the is also clear as both a nising syndrome acuity fell to 6/18 bilaterally despite further http://jnnp.bmj.com/ lesions were successfully treated: one case was therapeutic lumbar puncture. A second DSA treated by excision of the tumour and we showed no improvement in the occlusion of know of no previous report of a similar case the sinus. It was therefore decided, eight managed surgically. A survey of the literature weeks following the diagnosis of raised suggests that the underlying pathologies in intracranial pressure, to treat the lesion sur- these two cases, plasmacytoma and Ewing's gically. An occipital craniotomy was perfor- sarcoma, may be particularly likely to produce med and at operation the plasmacytoma was raised intracranial pressure by this mechan- readily peeled off the dura of the compressed on September 25, 2021 by guest. Protected copyright. ism. SSS, which visibly re-expanded at the end of Middlesex Hospital, the procedure. Following surgery there was an London, UK Department of immediate symptomatic improvement in Neurology Case reports visual function. A month later the optic discs G T Plant Case one were flat and the visual fields were normal, Department of A 42 year old West Indian man presented including the size of the blind spots, but the Neurosurgery with rib fractures. (IgA A Jackowski multiple Myeloma acuity impaired at 6/18 bilaterally. Six months Kappa) was diagnosed on bone biopsy. He later there had been no further improvement Department of Radiology was treated with intermittent chemotherapy and optic atrophy was noted. J J Donald for ten years with a good response. The course B E Kendall of the illness was one of recurrent plasma- Department of cytomas, often producing pathological Case two Medicine without evidence of bone marrow S J Vinnicombe fractures, A 19 year old warehouseman developed plasmacytosis. During the course of the dis- progressive left hip and knee pain over a Correspondence to: Dr Plant, The National ease he developed paraplegia secondary to period of six months. He then experienced Hospital for Neurology and compression of the spinal cord by a myeloma severe generalised headaches associated with Neurosurgery, Queen Square, London WCIN deposit in the body of T8. This responded to vomiting. Four days following the onset of the 3BG, UK treatment with steroids and radiotherapy. headaches he experienced visual obscurations Received 13 March 1990 At the age of 54 he complained of mild and intermittent horizontal diplopia. On and in revised form 20 July 1990. headaches and was noted to have bilateral examination he was afebrile without neck stiff- Accepted I November 1990 papilloedema. There were no other abnormal ness. Movements of the left hip and knee were Partial, non-thrombotic, superior sagittal sinus occlusion due to occipital skull tumours 521 J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.54.6.520 on 1 June 1991. Downloaded from Figure I (A) Contrast enhanced CT brain scan (case one) showing a midline occipital skull defect due to a plasmacytoma (arrow). (B) Venous phase ofDSA (case one) showing compression of the terminal portion of the SSS by the plasmacytoma, visible as a "tumour blush" (arrow). painful. Visual acuity was normal but the to 14 cm of CSF. The CSF protein was blind spots were enlarged on examination of 0-12 g/L, glucose 4-0 mmol/L, there was no the visual fields. There was bilateral weakness increase in cellularity and no malignant cells of the lateral recti and, on fundoscopy, were seen on cytological examination. Follow- bilateral papilloedema with haemorrhages. ing this procedure his headaches resolved and There were no focal neurological signs in the visual obscurations abated. An intravenous limbs. DSA was carried out which showed marked A radiograph of the left femur revealed an extrinsic compression of the SSS at the level extensive permeative lytic lesion involving the of the internal occipital protuberance (fig 2A). mid shaft with a periosteal reaction. A needle An isotope bone scan of the whole skeleton biopsy showed histological features typical of was later carried out showing increased uptake Ewing's sarcoma. A chest radiograph was nor- in the left femur, knee and ankle and at the mal. An unenhanced CT scan of the brain inion (fig 2B). http://jnnp.bmj.com/ showed ventricles of normal size and no Following these investigations the CT scan evidence of an intracranial mass. A lumbar was repeated. A scan with bone windows puncture was carried out. The opening pres- confirmed a prominent internal occipital sure was greater than 40 cm of CSF, and CSF protruberance but there was no evidence of was withdrawn until the pressure was reduced bone destruction. A CT scan with contrast on September 25, 2021 by guest. Protected copyright. (A 0 i ,<*s~~~ Az t. :: , .41 .. a. 0-cr't'. Figure 2 (A) Venous phase of DSA (case two) showing afilling defect in the terminal portion of the SSS which is compressed at this point (arrow). (B) Isotope bone scan showing high uptake at the inion (case two). 522 Plant, Donald, Jackowski, Vinnicombe, Kendall enhancement (fig 3) showed enhancement J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.54.6.520 on 1 June 1991. Downloaded from coinciding with the position at which the SSS normally divides to form the transverse sinuses (the torcular Herophili). These appearances are similar to normal enhance- ment of the dural sinuses at this point. In view of the fact that this coincides with the site of obstruction of the sinus on the DSA it was concluded that the enhancement was not of the sinus but an extradural metastatic deposit which had not caused any alteration in the appearance of the inner table of the skull. The patient was treated with combination chemotherapy on the UKCCSG protocol with IVAD (Ifosfamide, Vincristine and Adriamycin) as well as with concomitant radiotherapy to the left femur. Because of the tumour's extreme chemosensitivity, local Figure 4 Following treatment of case two with radiotherapy to the occipital metastasis was chemotherapy the SSS no longer appears compressed thought unnecessary. Over a period of three (compare fig 2A). weeks his papilloedema and weakness of the lateral recti resolved and there was no cribed by Averback3 and reviewed by Sigsbee et recurrence of headaches. al.4 SSS thrombosis may also occur as a "non- Follow up DSA (fig 4: four weeks following metastatic" complication of cancer.4 Mones5 the examination shown in fig 2A) showed a and, Korenman and Mones,6 however, des- normal appearance of the SSS in the venous cribed a series numbering 18 cases ofneoplastic phase of the angiogram with no evidence of disease with evidence of raised intracranial compression. The CT scan was not repeated. pressure without focal signs and without hydrocephalus or mass lesions. These cases have been incorrectly quoted as examples of Discussion SSS compression leading to thrombosis47 but The most recent review articles which have in fifteen cases it was shown angiographically or discussed raised intracranial pressure due to at necropsy that the SSS and torcular were dural sinus occlusion have concentrated on occluded or partially occluded by extradural dural sinus thrombosis.'2 Published cases of compression without thrombosis.