• Ramiro del Valle, Miguel Pérez, Juan Ortiz, Salvador Ruiz, Salvador de Anda, José Jaramillo, Manuel Martínez, Roberto Corona, Ingrid Vivas, Teresa Facha, Rosario Olmos, Arturo Arrieta, and Josué Estrada.
• Gamma Radiosurgery Department and MRI Department, Hospital Medica Sur. Mexico City, Mexico. rdvld@aol.com
• J. Neurosurg. 2005 Jan 1; 102 Suppl: 140-2.

ObjectVolume estimation is one of the most important criteria in the evaluation and follow up of radiosurgical treatments and outcomes; however, several limitations are involved in the calculation estimation of target volumes.MethodsRetrospective and prospective studies were conducted to evaluate the efficacy of a new noninvasive stereotactic method when it is compared with geometric volume calculation of intracranial tumors for planning stereotactic radiosurgery treatment as well as for follow up and outcome evaluation. Two equations were created that permit comparison of the calculated and measured volumes. These equations took linear and quadratic forms, respectively. Volume estimation using the stereotactic approach compared with traditional volume calculation gave more accurate results regardless of the shape and size of the lesion.ConclusionsThe use of stereotactic volume calculation is highly recommended in planning, follow up, and determination of the outcome in patients participating in radiosurgical treatment and should lead to more uniform reports of the response to treatment.

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