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A magnetic resonance imaging‐based classification system for indication of trans‐sphenoidal hypophysectomy in canine pituitary‐dependent hypercortisolism
Author(s) -
Sato A.,
Teshima T.,
Ishino H.,
Harada Y.,
Yogo T.,
Kanno N.,
Hasegawa D.,
Hara Y.
Publication year - 2016
Publication title -
journal of small animal practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.7
H-Index - 67
eISSN - 1748-5827
pISSN - 0022-4510
DOI - 10.1111/jsap.12474
Subject(s) - medicine , hypophysectomy , magnetic resonance imaging , cavernous sinus , pituitary gland , radiology , resection , surgery , hormone
Objectives The objectives of this study were to establish a magnetic resonance imaging‐based classification system for canine hyperadrenocorticism according to pituitary gland extension, determine indications for trans‐sphenoidal hypophysectomy, and clarify the prognosis for each disease grade. Methods A 5‐point classification system (Grades 1 to 5) was developed based on tumour extension in dorsal and cranio–caudal directions. Cases were then classified as Type A: no arterial circle of Willis or cavernous sinus involvement and Type B: cases in which these blood vessels were involved. Results Medical records and magnetic resonance imaging data of 37 cases with hyperadrenocorticism were reviewed. Thirty‐three cases underwent surgery; 4 Grade 5 cases did not have appropriate indications for surgery, and other therapies were used. Complete resection was achieved for 3, 3, 22 and 1 Grade 1A , 2A , 3A and 3B cases, respectively. Resection was incomplete in 1, 1 and 2 Grade 3A , 3B and 4B cases, respectively. Remission was achieved in 29 cases. Recurrence occurred in 4 cases, all of which were classified as Grade 3. Clinical Significance Dogs with Type A, Grade 1 to 3 hyperadrenocorticism had a good prognosis following trans‐sphenoidal hypophysectomy. Grade 3B , 4 and 5 cases may not be suitable for this surgery.