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Original article Etiology of testicular pain 2019: Classification into ten logical subgroups Etiología del dolor testicular 2019: Clasificación en diez subgrupos lógicos Juan Fernando Uribe-Arcila,1 Andrés Delgado-Montoya,1* Federico Gaviria-Gil.1 Abstract Background: Testicular pain encompasses a vast medical diagnostic field, with numerous organ and system convergence. Acute testicular pain is a medical emergency that requires accurate evaluation and immediate resolution, whe- reas chronic testicular pain is enigmatic and requires sound knowledge of the mechanisms of testicular pain and the differential diagnosis. Objective: To review the causes of testicular pain and propose a new etiologic classification consisting of 10 subgroups. Methods: A bibliographic search was carried out utilizing Google and the Na- tional Library of Medicine’s PubMed databases to identify original articles and review articles (hard copy or electronic) published on testicular pain, up to March 2020. The search included: MeSH terms: testicular disease (classifica- tion, complications, etiology, trauma, microbiology, pathology, pathophysiolo- gy, secondary, surgery, treatment) and vasectomy; Non-MeSH terms: acute and chronic orchialgia, scrotalgia, orchidynia, groin pain, epididymalgia, testalgia, chronic testicular pain, chronic scrotal pain syndrome, testicular pain syndro- me, epididymal pain syndrome, and post-vasectomy pain syndrome. The initial search produced 625 articles, of which 143 were included in the present review. Keywords: Results: To better understand testicular pain etiology, 100 possible diagnoses Pain, Acute pain, were divided into ten subgroups: infectious, neoplastic, traumatic, torsional, vascular, immunologic, neurologic, pharmacologic, obstructive, and miscella- Chronic pain, Visceral neous causes. Likewise, treatment can be divided into two main groups, ac- pain, Scrotal pain, cording to therapeutic options: pharmacologic and non-pharmacologic, with Testicular pain, the latter subdivided into: noninvasive and the increasingly performed invasive Orchialgia (surgical) alternatives. Conclusions: Testicular pain should be understood as a complex pain syndrome of enigmatic origin. Treatment success depends on the correct identification, Correspondence: from hundreds of possibilities, of the cause of pain. Logical grouping of those possibilities could aid in making the accurate etiologic identification. *Andrés Delgado-Mon- toya. Calle 78b #NO. Citación: Uribe-Arcila J. F., Delgado-Montoya A., Gaviria-Gil F. Etiology of testicular pain 69 - 240, Medellín, 2019: Classification into ten logical subgroups. Rev Mex Urol. 2020;80(4):pp 1-19 Antioquia, Colombia. Email: 1 Hospital Pablo Tobón Uribe, Medellín, Antioquia, Colombia. delgadoandresjkl@ Recepción: July 4, 2019 gmail.com Aceptación: July 26, 2020 REVISTA MEXICANA DE UROLOGÍA ISSN: 2007-4085, Vol. 80, núm. 4, julio-agosto 2020:pp. 1-19. 1 Etiología del dolor testicular 2019: Clasificación en diez subgrupos lógicos..Uribe-Arcila J. F., et al. Resumen Introducción: El dolor testicular es un vasto campo de diagnóstico mé- dico, donde convergen múltiples órganos y sistemas. El dolor testicular agudo es una emergencia médica que necesita una evaluación adecuada y una resolución inmediata; pero cuando aparece como un problema crónico, se convierte en un enigma que requiere un buen conocimiento de los mecanismos del dolor testicular y el diagnóstico diferencial. Objetivo: Revisar la etiología del dolor testicular y proponer una nueva clasificación en diez subgrupos etiológicos. Método: Se realizó una búsqueda bibliográfica en Google y las bases de datos National Library of Medicine’s PubMed para identificar artículos originales y de revisión, publicados o publicados electrónicamente, so- bre el dolor testicular, hasta marzo de 2020. Los términos de la búsque- da incluyeron: Términos MESH: Enfermedad testicular (Classificacion, complicationes, etiologia, trauma, microbiologia, patologia, fisiopatolo- gia, secondaria, cirugía, tratamiento) y vasectomia. Términos No MESH: orquialgia aguda y crónica, escrotalgia, orquidinia, inguinalgia, epididi- malgia, testalgia, dolor testicular crónico, síndrome de dolor escrotal crónico, síndrome de dolor testicular, síndrome de dolor epididimario y síndrome de dolor post vasectomía. La búsqueda inicial produjo 625 artículos y 145 se incluyeron en la presente revisión. Resultados: De 100 diagnósticos posibles, para comprender mejor la etiología del dolor testicular, se pueden subdividir en diez subgrupos: infecciosos, neoplásicos, traumáticos, torsionales, vasculares, inmuno- lógicos, neurológicos, farmacológicos, post obstrucción y causas diver- sas. Asimismo, el tratamiento se puede dividir en dos grupos mayores según las opciones terapéuticas: tratamiento farmacológico y no far- macológico, este último con una subdivisión: opciones no invasivas e Palabras clave: invasivas (quirúrgicas) que se están expandiendo. Dolor, Dolor agudo, Conclusiones: El dolor testicular debe entenderse como un síndrome Dolor crónico, Dolor doloroso complejo con un origen enigmático. El éxito del tratamiento visceral, Dolor depende de la correcta identificación de la fuente del dolor; con un cen- escrotal, Dolor tenar de causas posibles, el uso de una agrupación lógica podría facilitar testicular, Orquialgia esta identificación. 2 REVISTA MEXICANA DE UROLOGÍA ISSN: 2007-4085, Vol. 80, núm. 4, julio-agosto 2020:pp. 1-19. Etiología del dolor testicular 2019: Clasificación en diez subgrupos lógicos..Uribe-Arcila J. F., et al. Introduction the genesis of hydroceles. In 1776, John Hun- ter, an English surgeon, first reported a case Testicular pain is a constant reason for urology of testicular torsion, and 137 years later, Louis consultation. All medical professionals must Ombrédanne, one of the founders of pediatric be fully equipped with a powerful diagnostic surgery, described testicular appendage torsion vision that requires an open mind and healthy in 1913. In 1922, Colt considered testicular tor- skepticism, to prevent falling into the common sion a surgical emergency.(4–6) limitations of clinical judgment. Lack of awa- reness of the differential diagnosis can lead to errors and confusion with other diseases that Neuroanatomy of the Scrotal Contents share similar symptoms but have different causes and pathophysiology. Therefore, the Sensory innervation of the testis and epidid- present review aims to provide an updated ymis is conducted by autonomic and sensory inventory of the different and ever-changing fibers that travel through the spermatic cord. diagnostic and therapeutic options.(1–3) The somatic fibers of the cremaster muscle and the parietal and visceral layers of the tunica vaginalis travel via the genital branches of the History of Testicular Pain genitofemoral nerve (originating in L1-L2) and ilioinguinal nerve, arising from the first lumbar Testicular pain has been a human concern spinal nerve (L1). Testicular nociceptive fibers throughout history. In ancient Greek mytholo- travel via the sympathetic plexus (T10 to T12), gy, the testes were the preferred human body whereas the deferential and epididymal noci- parts utilized by the gods for tormenting men. ceptive fibers travel via the pelvic plexus (T10 Castration was a religious and medical practice to L1) throughout the vas deferens.(7–9) for more than 3000 years and is recorded in the old testament. Castrated men, called eunuchs, were employed in imperial palaces to guard Classification of Pain (Origin) the royal harem. In the 16th and 17th centu- ries, prepubescent boys were castrated so they The term orchialgia can often cause some level could remain choir singers, known as castrati, of confusion, since it suggests an exclusively retaining their clear, high, childlike voices. testicular origin (orchio-: testis). In fact, the In 1703 Giovanni Batista Morgagni (1682- origin of intrascrotal pain can be perceived in 1771), considered the father of European the inferior part of the abdomen, the internal anatomy, was the first to describe a hydatid of inguinal ring, the penis, the back, or the upper the testis, while he was the surgical assistant to part of the thighs, and not necessarily in the Antonio Maria Valsalva at the hospital of Santa testicular body, whereas in some extrascrotal Maria della Morte in Bologna, Italy. Hydatid pathologies, the painful sensation is directly means “drop of water” and Morgagni went to in the testis and its vicinity, altering patient his grave convinced that the rupture of those quality of life. Other more descriptive medical structures, which now bear his name, explained terminology has been employed, such as scro- REVISTA MEXICANA DE UROLOGÍA ISSN: 2007-4085, Vol. 80, núm. 4, julio-agosto 2020:pp. 1-19. 3 Etiología del dolor testicular 2019: Clasificación en diez subgrupos lógicos..Uribe-Arcila J. F., et al. talgia, orchidynia, groin pain, epididymalgia, activating a biochemical cascade that inclu- testalgia, testicular angina, chronic testicular des potassium release, sodium channel al- pain (CTP), chronic scrotal pain syndrome teration, and prostaglandin and bradykinin (CSPS), chronic unexplained orchialgia, and synthesis. Activation causes impulses from enigmatic syndrome, but they all appear to be the stimulated terminals to spread across equally incapable of conveying the complexity the dorsal horn of the spinal cord and other of this painful phenomenon. The testes (and adjacent nerve terminals before it achieves breasts and eyes) are the only organs of the
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