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Headache and Arachnoid Cysts ISSN 0017-8748 Headache doi: 10.1111/head.12415 © 2014 American Headache Society Published by Wiley Periodicals, Inc. Expert Opinion Headache and Arachnoid Cysts Jacob Cherian, MD; Ashwin Viswanathan, MD; Randolph W. Evans, MD Arachnoid cysts are commonly encountered when neuroimaging is obtained for headaches. Their clinical relevance is not always immediately clear and they may confound medical management. Key words: arachnoid cysts, headaches, migraine (Headache 2014;••:••-••) CASE HISTORY EXPERT COMMENTARY This is a 27-year-old male with a history of head- Arachnoid cysts are frequently found intracranial aches consistent with migraine without aura since lesions and are the most common congenital cystic childhood. Headaches have increased to twice a week abnormality in the brain.1 They have a reported in frequency. Past medical history is negative. Neuro- occurrence of 1.4%2 according to a recent natural logical examination is normal. Magnetic resonance history study surveying an adult population. They imaging (MRI) of the brain shows a left anterior consist of a confined diverticula emanating from the cranial fossa arachnoid cyst measuring 1.2-cm antero- natural septations of the arachnoid membrane and posterior by 1.6-cm transverse by 1.5-cm craniocaudad are filled with cerebrospinal fluid (CSF).A 1-way slit- without significant parenchymal compression. He is valve mechanism has been proposed by some to placed on a triptan with a good response. underlie their growth.3,4 QUESTIONS RADIOLOGIC FEATURES What are arachnoid cysts and their prevalence? The radiographic features of arachnoid cysts are Are headaches or other neurological symptoms asso- well defined. The cysts are extra-axial and the con- ciated? What is the natural history? When is surgery tents have the same signal as CSF. There may be indicated? evidence of bone remodeling on computed tomogra- phy (CT) including thinning and scalloping of the From the Department of Neurosurgery, Baylor College of bone (Fig. 1).1 By MRI, they are bright on T2 and Medicine, Houston, TX, USA (J. Cherian and A. dark on T1. They do not typically diffusion restrict, Viswanathan); Department of Neurology, Baylor College of Medicine, Houston, TX, USA (R.W. Evans). but occasionally they may have slightly increased signal intensity on diffusion-weighted imaging Address all correspondence to: A. Viswanathan, Department of Neurosurgery, 6501 Fannin Street, Suite NC-100, Houston, because of stasis of fluid within the cyst (Fig. 2). Epi- TX 77030, USA. dermoid cysts can have similar appearance by CT and T2-weighted imaging, but can be differentiated by Accepted for publication May 21, 2014. their avid diffusion-weighted intensity. 1 2 Fig 1.—Brain and bone windows of left middle fossa arachnoid cyst with remodeling of the lateral orbit and temporal bones. PREVALENCE AND NATURAL HISTORY of arachnoid cysts in an adult population.7 The charts Arachnoid cysts are thought of as benign lesions. of all 48,417 patients, 19 years or older, who under- They are often found during the workup of general- went brain MRI at the University of Michigan over a ized presenting symptoms such as headache.They are 12-year period were retrospectively reviewed. Six most commonly found in the middle fossa, but can hundred sixty-one patients or 1.4% were found to occur throughout the neuroaxis. A 2007 population- have arachnoid cysts, 1.8% males and 1.1% females. based study by Vernooij et al5 reviewing incidental The top 3 locations were middle fossa (34%), findings on brain MRI in 2000 patients with a mean retrocerebellar (33%), and cerebral convexity (14%). age of 63.3 years found arachnoid cysts in 22 patients Thirty-five patients were found to have neurologic (1.1%). A similar 1999 study looking at a younger symptoms thought to be attributable to their arach- population by Katzman et al6 reviewed MRIs in 1000 noid cysts; for 15, headache was the presenting asymptomatic volunteers with a mean age of symptom. 30.6 years found arachnoid cysts in 3 patients (0.3%). Of these 661 patients, 203 patients with 213 A recent excellent study by Al-Holou and col- arachnoid cysts were able to be followed for greater leagues examined the prevalence and natural history than 6 months with both imaging and clinical follow- Fig 2.—T1-, diffusion-, and T2-weighted imaging characteristics of a left middle fossa arachnoid cyst. Headache 3 up. Mean follow-up was 3.8 years. At the last avail- some of the generalized symptoms such as able follow-up, only 5 cysts were larger than at dyscognition that patients with these cysts present presentation and 2 were smaller. Most were thus with may be secondary to local dysfunction of com- unchanged. None of the patients followed developed pressed cerebral tissue. There was, however, no clear cyst-associated hemorrhage or symptomatic association in fluid volume reduction and clinical hygroma. improvement. The authors attempt to explain this Two of the followed patients developed symp- disassociation by arguing that adults with congenital toms thought to be attributable to their arachnoid arachnoid cysts have a remodeled cranium with cyst that ultimately required surgical management. surplus intracranial space. Thus despite successful In one, a convexity arachnoid cyst measuring cyst decompression and relief of compressed brain 4 × 6 × 7 cm initially presented without symptoms. tissue, relieved brain may not be large enough to fill Nearly 4 years later, the patient presented with the expanded intracranial space. This contrasts with seizure and headache. The cyst was found to have a previous study by the same group11 in children enlarged and was associated with increasing mass where there was a direct correlation between fluid effect and midline shift. Surgical fenestration was sub- volume reduction and clinical improvement. The sequently performed with reported improvement in authors believe that in children the mismatch symptoms. In the second case, the patient initially between skull and brain volumes may not be as pro- presented with an asymptomatic 1.6 × 2.2 × 1.9-cm nounced because they are operated on while the cerebellopontine angle arachnoid cyst. Over the brain and skull are still growing. course of 3.6 years, the patient developed ipsilateral In contrast, a recent series by Maher et al12 hearing loss and tinnitus with no clear increase in cyst managed 7 patients presenting with ruptured arach- size. Subsequent cyst fenestration helped stabilize noid cysts and associated subdural hygroma with symptoms, but was not curative. conservative management only. All 7 patients had a good clinical outcome and complete symptomatic MANAGEMENT resolution within weeks to a few months after pre- Classically, management of arachnoid cysts has sentation. This was despite the fact that half of the been observant and non-surgical. Surgical man- patients in the series had objective findings of agement has historically been reserved for cases elevated intracranial pressure such as papilledema, in which lesions appeared locally compressive in cranial nerve VI palsy, and progressive macro- patients with correlative neurologic findings or in cephaly. The authors, nonetheless, write that they those with obstructive hydrocephalus. Interventions would prefer surgical treatment as an initial therapy have consisted of localized craniotomies with surgi- for patients with severe symptoms or an especially cal marsupilization and drainage of the cyst. Endo- concerning neurological examination. They would scopic and shunting procedures have also been also consider surgical treatment in those patients described.8,9 whose condition was refractory to initial conserva- One recent series by Helland and Wester10 tive management. offered surgical decompression of all arachnoid cysts Arachnoid cysts of the middle fossa may also be in patients initially presenting with headache and associated with chronic subdural hematomas, which dizziness. Utilizing postoperative questionnaires, have variably been reported as occurring in 2.4%13 they report total symptom relief in 82% of cases. to 6.6%14 to 17.5% of patients,15 although another Twelve percent of patients reported no relief and large study suggests this is a rare event.7 Rarely, 6% reported worsening of symptoms. Significant arachnoid cysts may rupture into the subarachnoid complications causing permanent slight disability space causing a symptomatic CSF hygroma.7 Though were reported in 2 out of the 156 cases. In their con- the exact pathogenesis for the development of sub- clusion, the authors argue in favor of aggressive dural hematomas is not clear, 2 theories have management of these lesions. They suggest that been proposed. The first theory suggests that the 4 movement of fluid within the arachnoid cyst causes 2. Al-Holou WN, Terman S, Kilburg C, Garton HJL, a higher risk of tearing the small bridging vessels Muraszko KM, Maher CO. Prevalence and natural between the outer arachnoid membrane and the history of arachnoid cysts in adults. J Neurosurg. dura mater. The second theory postulates that 2013;118:222-231. chronic subdural hematomas are caused by bleeding 3. Halani SH, Safain MG, Heilman CB. Arachnoid cyst slit valves: The mechanism for arachnoid cyst of veins within the cyst wall itself. In patients with enlargement. J Neurosurg Pediatr. 2013;12:62-66. chronic subdural hematomas, both removal of the 4. Schroeder HW, Gaab MR. Endoscopic observation hematoma alone,15 and removal of the hematoma of a slit-valve mechanism in a suprasellar prepontine 14 along with fenestration of the arachnoid cyst, have arachnoid cyst: Case report. Neurosurgery. 1997; been effective treatment strategies. 40:198-200. 5. Vernooij MW, Ikram MA, Tanghe HL, et al. Inci- CONCLUSION dental findings on brain MRI in the general popula- Given the overall benign natural history,we prefer tion. N Engl J Med. 2007;357:1821-1828. a conservative, nonsurgical approach in patients who 6. Katzman GL, Dagher AP, Patronas NJ. Incidental present without neurological symptoms. We advocate findings on brain magnetic resonance imaging from 1000 asymptomatic volunteers.
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