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Percival Bailey and the Classification of Brain Tumors Neurosurg Focus 18 (4):E7, 2005 Percival Bailey and the classification of brain tumors SHERISE FERGUSON, M.A., AND MACIEJ S. LESNIAK, M.D. Division of Neurosurgery, The University of Chicago Pritzker School of Medicine, Chicago, Illinois Throughout his illustrious career, Percival Bailey made numerous contributions to the fields of neurology, neu- roanatomy, psychiatry, neuropathology, and, of course, neurosurgery. His expertise, his curiosity about the nervous system, and his desire to examine it from all angles were unique. With the exception of Harvey Cushing, Dr. Bailey made some of the greatest contributions in the area of neuro-oncology at the turn of the last century. In this essay the authors summarize the key episodes of Bailey’s life and discuss his impact on the classification and treatment of human brain tumors. KEY WORDS • Percival Bailey • brain tumor • meningioma • glioma • tumor classification • neurosurgical history Percival Bailey was born in 1892 in the southernmost routine dissection of the pituitary, Bailey unintention- part of Illinois, a rural area known as “Little Egypt.” He ally damaged the infundibular artery. At the time, Bailey spoke warmly of his memories of childhood and growing thought his mistake was an incredible blunder. Neverthe- up in this small town in his autobiography, Up from Little less, the next morning he found a large pool of urine on Egypt.8 Bailey’s early education took place in a one-room the floor next to the dog. To his surprise, he realized that schoolhouse and then at Southern Illinois Normal Univer- he had produced polyuria without exposing the pituitary sity. He originally intended to become a school teacher, gland. Bailey discussed his finding with a visiting neu- but with the death of his mother when he was 19 years old, rologist from Brussels, Dr. Frederic Bremer. In further his interest shifted to medicine.23 In 1912 Bailey trans- collaboration, the two found that without touching the pi- ferred to the University of Chicago, and while taking a tuitary, puncture of the hypothalamic infundibulum pro- neuroanatomy course he became instantly enamored with voked adiposogenital dystrophy and diabetes insipidus, the nervous system. In keeping with his newfound pas- and they attributed this result to disturbance of hypothala- sion, after earning his undergraduate degree Bailey went mic innervations of the pituitary.9,28 This was a ground- on to complete his doctoral dissertation on the develop- breaking finding and a major contribution to the rising ment of the choroid plexus.28 Indeed, his first publications field of neuroendocrinology. were on this very topic.6,7 By teaching gross anatomy, Bai- The partnership of Cushing and Bailey produced many ley was able to earn a medical education from Northwest- breakthroughs in the field of neurosurgery. Specifically, ern University in Evanston, Illinois. After graduating in their book A Classification of the Tumors of the Glioma 1918, he began a 9-month internship at Mercy Hospital in Group on a Histogenetic Basis with a Correlated Study of Chicago.23 Prognosis,15 which was published in 1926, formed the At the end of his internship, Bailey was positive that basis of modern-day neuro-oncology. Prior to the collabo- he wished to develop the field of neuroscience to a greater ration of these two pioneers, virtually all tumors of the extent. Apparently, he was not particularly concerned brain were called gliomas. In 1867, Virchow was the first whether his activities were in neurology, psychiatry, or to put forward the idea that these tumors arose from in- neurosurgery. He wrote two letters, one to Adolf Meyer, a terstitial brain tissue. Then, in 1875, Golgi showed that prominent psychiatrist at Johns Hopkins, and the other to some brain tumors contain distinctive star-shaped neu- Harvey Cushing in Boston, who was already recognized roglial cells of the brain, and he distinguished soft and as a brilliant neurological surgeon. As fate would have it, hard forms.5 Dr. Cushing replied first, and so Bailey arrived at the Peter During this era, it was also known that some tumors Bent Brigham Hospital in 1919.28 It was under the tutelage could be either aggressive or benign. Nevertheless, the of Cushing that Bailey flourished as a neurological sur- classification of brain tumors was in its infancy. Some, geon and made some of his most impressive contributions such as Cushing himself, considered the classification of to the scientific community. glial tumors to be in a state of disarray. Bailey and Cush- Interestingly, Bailey’s first contribution was entirely ing believed that the existing classifications of gliomas accidental. Some of Cushing’s earlier research was dedi- were both inadequate and confusing. They also believed cated to the study of hypophysectomy in dogs, and as his that the only way order could be attained was through the student, Bailey was assigned to these studies. During a meticulous examination of a large series of tumor speci- Neurosurg. Focus / Volume 18 / April, 2005 1 Unauthenticated | Downloaded 09/29/21 10:08 AM UTC S. Ferguson and M. S. Lesniak mens and medical records in cases that had been observed He and Cushing had specimens of 31 of these intriguing over a period of years, from the onset of symptoms to the tumors, each of which they scrutinized in detail in an at- death of the patient.1 With this in mind, they set out to un- tempt to determine its natural history. At that time, Bailey derstand the basis of the structural variability shown by and Cushing formulated a theory on the origin of the gliomas and to determine whether these histological dif- medulloblastoma. As recounted in Kunschner,27 they pos- ferences carried clinical implications. Furthermore, they tulated that this tumor was derived from embryonic undif- aimed to refute the ubiquitous notion that microscopic ex- ferentiated cells in the ependymal lining of the fourth ven- amination of a specimen removed at operation could not tricle. Moreover, they described the characteristic gross serve to predict the clinical course of the disease.14 Fortu- and microscopic structure of this tumor; its reddish-gray nately, Cushing had an extensive collection of brain tumor color, extremely cellular nature, numerous mitotic figures, specimens amassed from his surgical experiences and and the formation of pseudorosettes, as detailed later by Bailey was more than happy to take on such an assign- Bailey.5 Additionally, Bailey observed the tendency of this ment. It seemed to be the ideal opportunity to apply his tumor to spread to the leptomeninges, which proved val- knowledge of neuropathology and neuroanatomy to neu- uable in terms of treatment considerations. Bailey and rosurgery. Cushing contributed not only to the description of this This auspicious work began in 1922 when Bailey first neoplasm but also to its treatment. At the time, the grim began to classify the gliomas, working intermittently for prognosis for patients with medulloblastomas was well the next 3 years. Bailey began by going through the spec- documented. This fact encouraged Cushing to introduce imens as they came into the laboratory and arranging them radiotherapy in the postoperative care of patients with in groups according to length of the patient’s survival.1 medulloblastomas. In 1928 and 1930, Bailey went further, Additionally, new methods such as impregnation allowed publishing articles about the effects of radiotherapy on for the demonstration of both neuronal and interstitial as- medulloblastomas. Interestingly enough, he was the first pects of the nervous system.32 All in all, Bailey exhaus- to explain the complications associated with this therapy, tively examined and classified the pathological material including brain edema.2,18 This work paved the way for and records of a total of 414 cases of glioma in Cushing’s the use of craniospinal radiation treatment in medullo- series and performed histological tissue studies in 254 of blastomas. these.24 Based on the predominant cellular configuration, Bailey and Cushing spent almost 10 years working Bailey classified these tumors into 13 categories. together, both as clinicians and as researchers. In this time, This histological categorization was the first ever and they wrote a second monograph titled Tumors Arising formed the basis for all subsequent classification. The re- from Blood-Vessels of the Brain; Angiomatous Malfor- sults of the glioma studies were first reported by Cushing mations and Hemangioblastomas,26 in 1928. Although in the Cameron Prize Lectures given at the University of this book did not receive the recognition accorded to their Edinburgh in October of 1925.24 In 1926, the completed earlier work on tumors of the glioma group, it was ahead monograph by Bailey and Cushing, A Classification of of its time in its depiction of the microscopic structure of the Tumors of the Glioma Group on a Histogenetic Basis hemangioblastomas.22,25,27 In fact, it was Bailey and Cush- with a Correlated Study of Prognosis, was published.14 ing who introduced the term hemangioblastoma. Another This book completely revolutionized the understanding of noteworthy accomplishment of this pair was their estab- neuro-oncology, and for first time the neurosurgical com- lishment of the microscopic structure of pituitary adeno- munity was presented with an orderly classification of gli- mas. In 1928, they were the first to describe the condition omas based on the tumor’s natural history and clinical known as fugitive acromegaly, in which patients may ex- course. This was, of course, an achievement of immense hibit physical stigmata of acromegaly without biochemi- practical value and earned Bailey and Cushing worldwide cal evidence of the disease.16,22 recognition. After a decade with Cushing, Bailey was ready to ven- In 1927, Bailey3 simplified the glioma classification to ture out on his own, and in 1928 he was selected to head 10 groups, and this new system correlated the tumor type the neurosurgery section at the University of Chicago.
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