INTRODUCTION
The diagnosis of reversible cerebral vasoconstriction syndrome (RCVS) often may be misleading and delayed because of the dynamic evolution of clinico-radiological features. RCVS is known to have an initial week of a hemorrhagic phase, which is later followed by ischemic complications. The angiographic features of RCVS are often best demonstrable only in the ischemic phase. Here, we present an unusual case of large basal ganglia hemorrhage in which the diagnosis was initially considered vasculitis. The diagnosis of RCVS was subsequently established by excellent angiographic reversibility to intra-arterial milrinone.
CASE REPORT
A 34-year-old pregnant female (gravida 4, para 2, abortion 1, intrauterine death 1) at 32 weeks of gestation presented with preterm premature rupture of membranes. The patient had a background history of dermatomyositis with interstitial lung disease in remission for the last 4 years. She was initially optimized on steroids and mycophenolate mofetil and subsequently switched to tacrolimus after detection of pregnancy. She underwent an uneventful emergency cesarean section under regional anesthesia. During the next day, she developed a moderately severe headache, which was holocranial and continuous. She had no features of raised intracranial tension. Her headache was not relieved with analgesics, and on the second postoperative day, she developed a generalized seizure during sleep. She continued to be in a comatose state following the seizure with a Glasgow Coma Scale score of eye opening (E)1, verbal response (V)2, best motor response (M)5. Serial blood pressure readings were normal in the post-partum period. Examination revealed bilateral pupils 1.5 mm in size and a sluggish reaction to light, along with a paucity of movements in the right extremities. Magnetic resonance imaging of the brain showed a large intra-parenchymal hematoma involving the left ganglio-capsular and frontotemporal regions causing a midline shift of 16 mm with intra-ventricular extension and uncal herniation (Fig. 1A). She underwent emergency craniotomy and hematoma evacuation. A postoperative computed tomography (CT) scan of the brain showed good evacuation of the hematoma and correction of midline shift (Fig. 1B). Computed tomography angiography (CTA) showed mild focal narrowing and irregularities in distal branches of bilateral middle cerebral arteries, anterior cerebral arteries, and posterior cerebral arteries (Fig. 1C). In the background of dermatomyositis and radiological findings, the possibility of vasculitis was considered. Erythrocyte sedimentation rate was 25 mm/h and C-reactive protein was 6 mg/L. Autoimmune workup for vasculitis including antinuclear antibody, antineutrophil cytoplasmic antibodies, rheumatoid factor, and antiphospholipid antibodies were negative. Viral serology for hepatitis B, hepatitis C, and human immunodeficiency virus was negative. Intravenous pulse methylprednisolone was given for 3 days; however, she continued to be in a deep coma. Serial follow-up CT scans of the brain did not show any hydrocephalus or bleed. Electroencephalogram did not show any epileptiform abnormalities. On the twelfth postoperative day, an examination revealed the patient to be in a quadriparetic state because of a newly developed left-sided weakness. A consequent CT brain showed multiple infarcts in the territories of the right anterior and middle cerebral arteries (Fig. 1D). Digital subtraction angiography (DSA) done on the same day showed severe narrowing and irregularity of bilateral anterior, middle, and posterior cerebral arteries, which showed excellent reversibility to intra-arterial milrinone infusion over 15 minutes (Fig. 1E, F). She was continued on intravenous milrinone infusion for 7 days. The diagnosis of RCVS was made secondary to her post-partum status, along with a possible etiological implication of tacrolimus therapy. Despite an RCVS2 score of only 4, which implies a low diagnostic sensitivity for the syndrome, the diagnosis of RCVS as opposed to vasculitis, was supported by excellent reversibility of angiographic abnormalities to milrinone [1]. Subsequently, the patient gradually recovered from her comatose state and started moving her right upper and lower limbs. CTA done before the discharge from the hospital in the sixth postoperative week showed no significant abnormalities. She was conscious and alert at the time of discharge with a power of grade 3/5 and 2/5 in her right and left extremities, respectively. Her neurological recovery is expected to be delayed due to bihemispheric dysfunction and multiple infarcts in the right cerebral hemisphere before milrinone therapy.
DISCUSSION
RCVS is a clinical and radiological syndrome characterized by sudden severe headache and reversible multifocal narrowing of cerebral arteries [2]. This syndrome is often considered to have a benign outcome; however, major strokes resulting in severe disability and death have been reported [3]. A recent systematic review has observed intracerebral hemorrhage (ICH) as the most common presentation (42%) in fatal RCVS cases, followed by encephalopathy and/or headaches in 25%, and ischemic stroke and posterior reversible encephalopathy syndrome in 16.5% each [4]. The same review noted that half of these fatal cases initially presented with a non-specific headache (NSH). Our patient also had NSH as the initial manifestation. Diagnosis of RCVS can often be delayed due to the dynamic natural history and radiological features of the disease. Stroke may occur after a few days of the initial normal brain imaging. Further, angiographic vasoconstriction may show up the best only after 2–3 weeks of the clinical onset [3].
In the present case, we were deceived initially by the mild distal focal narrowings on CTA, which steered our diagnosis towards cerebral vasculitis especially against the backdrop of dermatomyositis. Central nervous system vasculitis is known to be associated with ICH [5]. Consequently, we started pulse therapy of intravenous methylprednisolone; the patient, however, continued to be in a comatose state. She instead developed new cerebral infarcts, and hence underwent DSA, which revealed severe multi-focal narrowings that demonstrated a striking reversal on the administration of intra-arterial milrinone. So, a probable diagnosis of RCVS was established, which was further supported by the normal CTA in the sixth postoperative week. In the retrospect, however, we understand that corticosteroid use may result in a poor outcome in RCVS and should be avoided, although, in our case, it was used considering the possibility of vasculitis before the diagnosis got confirmed [6,7].
This case of fulminant RCVS was unusual and left us with several learning lessons. First, the diagnosis was delayed because of the characteristically dynamic natural history of the disease. Clinically, our patient presented with a non-specific headache initially, as against a thunderclap headache which is classically seen in RCVS. Furthermore, this disease is described as having an initial hemorrhagic phase followed by an ischemic phase in the second week [8-10]. It is also characterized by minimal angiographic findings in the initial hemorrhagic phase when the vasospasm is in the distal vessels, which is followed by proximal migration of vasospasm causing ischemic strokes in the second phase [8]. Although the evolution of radiological changes with time has been described in the literature, this case highlights how this may cause confusion in the diagnosis and require caution in evaluating such cases. Normal angiography in the first week may not rule out the disease and a repeat angiography may be warranted if the clinical suspicion of the RCVS is high. Further, our patient had a massive ganglio-capsular regional bleed, which has rarely been mentioned in the medical literature. RCVS commonly presents in the hemorrhagic phase as SAH and cortical bleeds [3]. It may be noted that the presence of a large basal ganglia hemorrhage should not preclude one from considering RCVS as a diagnosis, especially in an appropriate clinical setting such as a post-partum state. The exposure of our patient to tacrolimus further strengthened the associated risk.
Lastly, the high diagnostic utility of intra-arterial milrinone for RCVS has a mere anecdotal mention in the literature [11]. We, however, observed it to have a dramatic role in reversing the vasoconstriction; and thus, it has a remarkable potential for differentiating RCVS from vasculitis. In the medical literature though, angiographic response to intra-arterial vasodilators is varied and there is a lack of strong evidence for the therapeutic role of the same in RCVS [11-14]. Randomized studies conducted on the role of Nimodipine for the same have not shown any significant benefit [15,16]. Thus, our case may be considered as a potential source for conducting further randomized studies in this regard. It would be worthwhile to see if the diagnostic utility of milrinone as observed in our case can be established further with well-designed prospective studies. In conclusion, intra-arterial milrinone appears to have a significant diagnostic utility for RCVS.
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