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Volume 21, Number 6, 2016

Asymptomatic internal carotid artery occlusion after gamma knife radiosurgery for pituitary adenoma: Report of two cases and review of the literature

Giorgio Spatola, Laura Frosio, Marco Losa, Antonella del Vecchio, Martina Piloni, Pietro Mortini

Summary:

Background

Gamma knife radiosurgery is an effective and safe treatment modality in the management of pituitary adenomas. Internal carotid occlusion is a rare but possible complication of Gamma Knife Radiosurgery for lesions within the cavernous sinus.

Aim

To stress the importance of considering the Internal carotid artery as an organ at risk in cavernous sinus invading adenomas and reduce the dose delivered to this structure whenever possible.

Case description

We report two cases of asymptomatic occlusion of the intracavernous segment of the internal carotid artery seven years after treatment in acromegalic patients. After trans-sphenoidal surgery, residual tumour was treated with gamma knife radiosurgery. The maximal doses to the affected artery were higher than 40 Gy and the 90% isodose was close to the arterial wall.

Conclusion

Every effort should be done to minimize the radiation dose to the internal carotid artery. If not possible, “hot spots” exceeding the 90% isodose close to this vessel should be avoided.

Signature: Rep Pract Oncol Radiother, 2016; 21(6) : 555-559


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http://www.sciencedirect.com/science/journal/15071367/19/2