Giant colloid cyst of the third ventricle: challenges in management
© The Author(s) 2016
Received: 30 November 2015
Accepted: 18 February 2016
Published: 28 April 2016
Giant colloid cysts (size > 3 cm) are very rare with only few reported cases in the literature.
We report a case of 44 year female who presented with features of raised intracranial pressure, memory and gait disturbances. CT and MR imaging showed a large colloid cyst at foramen of Monro leading to obstructive hydrocephalus. The patient underwent right interhemispheric transcallosal-transforaminal approach and complete excision of the cyst.
For a large size of colloid cyst complete surgical excision is recommended. However deep midline location, proximity to the vital structures and giant size of the lesions make surrounding vital structures vulnerable for injury.
KeywordsColloid cyst Giant Intracranial tumor
Intracranial colloid cysts usually present as incidental findings on neuroimaging [1, 2]. Colloid cysts are of tremendous interest as they are of benign nature, are surgically challenging to manage as these are deeply located, and have an excellent prognosis when diagnosed early and totally excised . Usually the size of the colloid cysts range from range from 0.3–4.0 cm in size (mean 1.5 cm) [4–7]. Giant colloid cysts (size > 3 cm) are very rare with only few reported cases in the literature [8–12]. We present a case of giant colloid cyst of the anterior third ventricle which was managed successfully.
Although colloid cysts are histologically benign in nature, their midline location can cause obstruction of the foramen of Monro resulting in obstructive hydrocephalus [1, 2, 4]. Even smaller lesions have been reported to be associated with sudden death [5, 13–16]. Clinically colloid cysts can be asymptomatic (incidental finding on neuroimaging), seizures, can present with features of raised intracranial pressure (headache, vomiting, and papilledema) due to the development of hydrocephalus or can cause progressive memory loss thus requiring surgical intervention [1, 2, 11, 14, 16, 17]. CT scan with contrast administration can be the initial modality of investigation, however MRI will provide greater details regarding, size, relationship with the surrounding structures and nature of the cyst. [4, 5, 18–20] Imaging appearance depend on the composition and density of the cysts contents (quantity of cholesterol and protein) [5, 19, 20]. Characteristically colloid cyst appear as well-delineated hyperdense lesion at the foramen of Monro Usually the colloid cyst does not enhance on CT as well as on MRI [2, 5, 18–21]. Larger lesions can be associated with calcification in the cyst wall . Most of the colloid cysts are hyperintense on T1-weighted MR images and on T2-weighted images becomes hyperintense in relation to brain parenchyma [5, 18–20]. Although on T2-weighted MR images, the appearance can range from hypointense to hyperintense, and the cyst can be homogeneous or heterogeneous . Although on neuroimaging a diagnosis of colloid can be suspected, however histopathology will confirm the diagnosis [1, 18, 19]. The management options for colloid cysts include stereotactic aspiration, endoscopic fenestration and microsurgical excision [15, 20, 23–25]. Because of the large size of the lesion, complete surgical excision by transcortical/transventricular approach is preferred modality of management for giant size lesions [2, 11].
It has been suggested that neuroendoscopy is a safer and more effective approach (shorter operating time and hospital stay) than transcallosal craniotomy and can be considered as the first line of treatment . However neuroendscopy can be more challenging and demanding to manage such a large lesions. Deep midline location, proximity to the vital structures and giant size of the lesions can predispose surrounding vital structures vulnerable for injury [1, 23, 24, 27, 28]. Injury to the vital structures can lead to transient or permanent memory loss, motor deficits, seizures, hemorrhage, hydrocephalus and infection [23, 24].
We obtained written permission from the patient to publish this case report.
Magnetic Resonance Imaging
Fluid attenuation inversion recovery
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