Fibromuscular Dysplasia Complicated by Primary
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Case Report Fibromuscular Dysplasia Complicated by Primary Thrombocythemia Presenting Recurrent Ischemic Cerebrovascular Accidents: A Case Report Kaori ABE, Satoru OHTA, Tadatoshi KOMIYA, Naotaka Sakamoto* and Yoshikuni Mizuno A patient with fibromuscular dysplasia associated with primary thrombocythemia is reported. The patient, a 46-year-old female, had recurrent episodes of ischemic cerebrovascular accidents. Cranial CTscans revealed multiple low density areas in the right frontal and parietal lobes, and cerebral angiograms showed evidence of multiple embolisms. In addition, occlusion of the right internal carotid artery developed. Toour knowledge, this is the first report on fibromuscular dysplasia complicated by essential thrombocythemia. The pathogenesis of the severe thrombotic tendency is discussed. Key words: Fibromuscular dysplasia , Cerebral infarction, Transient ischemic attack, Carotid occlusion Both essential thrombocythemia and fibro- bocytosis was noted at the time. From the summer muscular dysplasia are rare disorders in Japan. They of 1988 on, she had frequent episodes of headache can be considered as possible causes of stroke in for which she required an ergot derivative for 6 younger persons. Wereport a patient with fibro- months. Also, in August 1988, she had an episode muscular dysplasia complicated by essential throm- of tingling sensation and weakness in her left hand. bocythemia. To our knowledge, such an association In January 1989 she felt a transient weakness on the has never been reported. The patient showed left side of her face and dysarthria upon waking up multiple cerebrovascular thrombo-embolicepisodes one morning. OnMarch 8, 1989 she noted weakness and complete occlusion of the right internal carotid in her upper and lower left extremities and was artery. The purpose of this report is to present the admitted to the Department of Radiology at first known case of fibromuscular dysplasia Juntendo University Medical Center the next day. associated with primary thrombocythemia and to A low density area was found in the right parieto- discuss the pathogenesis and the treatment of this occipital area by CT, and angiograms revealed disorder. irregularities in the right internal carotid artery. Her symptoms improved during the next 3 weeks, and she CASE REPORT was discharged with a prescription of 200 mg/day The patient, a 46-year-old female, who was well ticlopidine. On April 4, she again had an episode until the end of December 1987, had a sudden onset of headache and felt weakness in her left arm. On of severe occipital headache, nausea and tinnitus. April 7, weakness appeared in her left leg. She was She was admitted to a hospital where the neuro- re-admitted to the Department of Radiology. On the logical examination and cranial CT scan were 7th hospital day, she noted a visual field defect in reported to have been normal. However, throm- her right eye, and the neurology service was asked From Department of Neurology and *Radiology, Juntendo University School of Medicine, Tokyo Received for publication December 27, 1989; Accepted for publication July 24, 1990 Reprint requests should be addressed to Yoshikuni Mizuno, MD,Department of Neurology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113, Japan 548 Jpn J Med Vol 29, No 5 (September, October 1990) Fibromuscular Dysplasia and Thrombocythemia to see the patient. left extremity with pseudo-athetotic movements in Physical examination revealed a well-nourished the left hand. No cerebellar ataxia was present. Deep and well-developed Japanese female in no acute reflexes were slightly exaggerated in her upper left distress. Blood pressure was 130/70 mmHg,and the extremity. No pathological reflexes were noted. pulse rate 70/min and regular. No cervical bruit was Superficial and vibration senses were normal. noted. There wasneither cardiac enlargement nor However, position, movement,stereotactic and two- heart murmur. The lungs were clear. No hepato- point discriminative sensations were diminished in splenomegaly was noted. her left hand. Neurological examination revealed an alert and The laboratory findings are summarized in Table intelligent female. Neither aphasia, apraxia nor 1. A marked increase in thrombocytes with giant agnosia was noted. Her visual acuity was 0.01 on platelets in the peripheral blood was noted (Fig. 1A). the right and 1.2 on the left. She showed a concentric Bleeding time was 1.5 min, PTT 37.9 s and PT 10.0 narrowing of the visual field bilaterally and a central s. The blood thromboxane B2 level was elevated to scotoma in her right eye. The optic fundi showed 78 pg/ml (normal: 14-50), and platelet factor 4 to occlusion of the right central retinal artery. Occular 49 ng/ml (20 >). These values were interpreted as movement,pupils and light reflex were normal. No suggesting the presence of a thrombotic tendency. nystagmus was seen. She showed left facial weakness Protein C, factor VIII, antithrombin III, fibrinogen, and deviation of the tongue to the left without FDP, oyplasmin and plasminogen inhibitor were atrophy. Other cranial nerves were intact. Her gait normal. The CSF findings were unremarkable. was normal. Slight weakness was noted in her upper Echocardiography and ECGwere normal. Ab- Table 1. Laboratory data. (Data on admission) RBC 442 x lO4/mm3 GOT 19 IU/1 (5-35) Hb 14.2 g/dl GPT 17 » (4-30) Ht 41.7% LDH 625 " (125-500) WBC 13800/mm3 ALP 5.5 KAU (1.6-9.9) Meta 1% BUN 1 1 mg/dl (8-17) Stab 6% Creatinine 0.7 » (0.6-1.2) Seg 72% Na 139 mEq/1 Lympho 10.5% K 3.7 " Mono 3% Cl ,104 " Eos 4.5% T cholesterol 168 mg/dl (150-230) Baso 2.5% Triglycerides 89 » (37-150) PLT 824x l03/mm3 Phospholipids 179 » (150-250) Anti-cardiolipin antibody (-) Mar3 Apr19 Apr25 May10 May20 PLT ( x lO3/mm3) 824 601 1072 1034 1268 Giant PLT + + + WBC ( /mm3) 13800 11400 12900 10100 11700 RBC ( x lOVmm3) 442 466 496 473 451 ESR (1 h/2 h) 4/12 5/ 7/18 9/24 CRP - Mar14 Mar23 Apr20 May16 Platelet 40% 16% 28% 12% aggregation* *ADP 2.3/uM (N: 40-70%) Jpn J Med Vol 29, No 5 (September, October 1990) 549 Abe et al Fig. 1. Giant platelets in the peripheral blood (A), and increase in megakaryocytes in the bone marrow (B). dominal CT scan and ultrasound examination Alow density area with scattered high density spots showedslight splenomegaly. Bone marrow examina- was seen in the right parieto-occipital area on March tion revealed mild generalized hyperplasia (Fig. IB), 9. Asimilar low density area was noted in the frontal including megakaryocytic hyperplasja. Neither lobe on April 10. Cerebral angiograms on March fibrosis nor leukemic cell infiltration was noted. The 9 (Fig. 3A) showed a narrowing in the right internal differential count of bone marrow cells was normal. carotid artery 2 cm above the bifurcation. The Chromosomeanalysis of a bone marrow aspirate appearance of the narrowing suggested "tubular wasnormal. Her neurophile alkaline phosphatase stenosis." The left internal carotid artery showed score was 224 (240 ±60). multiple segmental narrowing and dilatation. Direct The serial cranial CT scans are shown in Fig. 2. right carotid angiograms on the same day (Fig. 4A, Fig. 2. Cranial CT scans on March 9. A low density area with scattered high density spots is seen in the right parieto-occipital area (A), and a low density area in the frontal lobe on April 10 (B). 550 Jpn J Med Vol 29, No 5 (September, October 1990) Fibromuscular Dysplasia and Thrombocythemia B) showed a filling defect along the wall of the right vical spine and extending into the intracranial internal carotid artery in its cavernous portion portion. The entire vascular lumen showed marked extending into the horizontal portion of the right irregular narrowing. Therenal arteries werenormal middle cerebral artery. The terminal branches of the on the aortogram. The right carotid angiogram per- right middle cerebral artery showed multiple area of formed 10 days later (Fig. 6A) revealed no filling obstruction and narrowing, suggesting shower defect in the portion where the previous angiograms embolisms. The right vertebral angiograms on the had shown a marked filling defect. The digital sub- same day, March 9, (Fig. 5) showed segmental traction angiograms (DSA) on April 7 (Fig. 6B) narrowing originating at the level of the first cer- revealed a complete occlusion of the right internal carotid artery just above the bifurcation. Collateral circulations to the right internal carotid area were well visualized through the right ophthalmic artery and the right middle meningeal artery. She was treated with intravenous infusion of glycerol, and her weakness almost disappeared. The central scotomaand deep sensory loss of the left hand did not improve. She was then treated with a 160 mg dose of aspirin every other day and 0.75 mg carbocon daily, and was discharged on the May 24. Platelet count was 60 x lOVmm3,platelet factor 4 27 ng/ml and thromboxane B2 17 pg/ml upon discharge. For the past 6 months, since her discharge from our hospital, she has been doing well. DISCUSSION Fig. 3. The digital subtraction angiogram of cerebral We diagnosed this patient as having vessels on March 10. A narrowing (arrow) is seen in the fibromuscular dysplasia complicated by essential cervical portion of the right internal carotid artery (A), and thrombocythemia. The combination of these two multiple segmental stenoses and dilatations (arrow) in the cervical portion of the left internal carotid artery (B). disorders is rare. Essential thrombocythemia is Fig. 4. The right carotid angiogram obtained on March 10. An irregular filling defect is seen from the cavernous portion of the internal carotid to the horizontal portion of the middle cerebral artery. Multiple occlusions are seen in the pre-central and the anterior parietal arteries (arrows), and stenoses in the posterior parietal and the angular arteries (arrowheads).