R K Sellon1, J Fidel, R Houston, P R Gavin. 1. Department of Veterinary Clinical Sciences, Washington State University, Pullman, WA 99164, USA.
Abstract
OBJECTIVE: Determine the efficacy and safety of a linear-accelerator-based single fraction radiosurgical approach to the treatment of pituitary tumors in cats. DESIGN: Retrospective study. ANIMALS: Eleven client-owned cats referred for treatment of pituitary tumors causing neurological signs, or poorly controlled diabetes mellitus (DM) secondary either to acromegaly or pituitary-dependent hyperadrenocortism. PROCEDURES: Cats underwent magnetic resonance imaging (MRI) of the brain to manually plan radiation therapy. After MRI, modified radiosurgery was performed by delivering a single large dose (15 or 20 Gy) of radiation while arcing a linear-accelerator-generated radiation beam around the cat's head with the pituitary mass at the center of the beam. Eight cats were treated once, 2 cats were treated twice, and 1 cat received 3 treatments. Treated cats were evaluated for improvement in endocrine function or resolution of neurological disease by review of medical records or contact with referring veterinarians and owners. RESULTS: Improvement in clinical signs occurred in 7/11 (63.6%) of treated cats. Five of 9 cats with poorly regulated DM had improved insulin responses, and 2/2 cats with neurological signs had clinical improvement. There were no confirmed acute or late adverse radiation effects. The overall median survival was 25 months (range, 1-60), and 3 cats were still alive. CONCLUSIONS AND CLINICAL IMPORTANCE: Single fraction modified radiosurgery is a safe and effective approach to the treatment of pituitary tumors in cats.
OBJECTIVE: Determine the efficacy and safety of a linear-accelerator-based single fraction radiosurgical approach to the treatment of pituitary tumors in cats. DESIGN: Retrospective study. ANIMALS: Eleven client-owned cats referred for treatment of pituitary tumors causing neurological signs, or poorly controlled diabetes mellitus (DM) secondary either to acromegaly or pituitary-dependent hyperadrenocortism. PROCEDURES: Cats underwent magnetic resonance imaging (MRI) of the brain to manually plan radiation therapy. After MRI, modified radiosurgery was performed by delivering a single large dose (15 or 20 Gy) of radiation while arcing a linear-accelerator-generated radiation beam around the cat's head with the pituitary mass at the center of the beam. Eight cats were treated once, 2 cats were treated twice, and 1 cat received 3 treatments. Treated cats were evaluated for improvement in endocrine function or resolution of neurological disease by review of medical records or contact with referring veterinarians and owners. RESULTS: Improvement in clinical signs occurred in 7/11 (63.6%) of treated cats. Five of 9 cats with poorly regulated DM had improved insulin responses, and 2/2 cats with neurological signs had clinical improvement. There were no confirmed acute or late adverse radiation effects. The overall median survival was 25 months (range, 1-60), and 3 cats were still alive. CONCLUSIONS AND CLINICAL IMPORTANCE: Single fraction modified radiosurgery is a safe and effective approach to the treatment of pituitary tumors in cats.
Authors: Tiffany L Wormhoudt; Mary-Keara Boss; Katharine Lunn; Lynn Griffin; Del Leary; Kristy Dowers; Sangeeta Rao; Susan M LaRue Journal: J Vet Intern Med Date: 2018-05-21 Impact factor: 3.333
Authors: Joe Fenn; Patrick J Kenny; Christopher J Scudder; Katarina Hazuchova; Ruth Gostelow; Robert C Fowkes; Yaiza Forcada; David B Church; Stijn J M Niessen Journal: J Vet Intern Med Date: 2021-02-24 Impact factor: 3.333