Bilateral extensor digitorum brevis manus. / Extensor digitorum brevis manus bilateral.

INTRODUCTION: The extensor digitorum brevis manus (EDBM) is an accessory muscle of the dorsum of the hand that may appear as a painful mass. It is treated surgically, usually by excision of the muscle. CASE REPORT: 14-year-old male with bilateral painful masses on the dorsal aspect of his hands. Ultrasound confirmed the diagnosis of EDBM. Due to the associated symptoms, decision was made to conduct surgical treatment with resection of both muscle masses. DISCUSSION: EDBM is an infrequent cause of wrist pain, especially in children and adolescents. Surgical treatment has proven to have a significant impact on the improvement of the symptoms suffered by these patients.

INTRODUCCION: El extensor digitorum brevis manus (EDBM) es un músculo accesorio del dorso de la mano que puede presentarse como una masa dolorosa. Su tratamiento es quirúrgico, generalmente consiste en la extirpación del mismo. CASO CLINICO: Varón de 14 años que presenta tumoraciones dolorosas bilaterales en la cara dorsal de las manos. La ecografía confirma el diagnóstico de EDBM. Debido a la sintomatología asociada, se decide tratamiento quirúrgico, con resección de ambas masas musculares. COMENTARIOS: El EDBM constituye una causa poco frecuente de dolor a nivel de la muñeca, especialmente en población infanto-juvenil. El tratamiento quirúrgico ha demostrado un impacto significativo en la mejoría de la sintomatología que presentan estos pacientes.

Extensor digitorum brevis manus bilateral / Bilateral extensor digitorum brevis manus

Introducción: El extensor digitorum brevis manus (EDBM) es unmúsculo accesorio del dorso de la mano que puede presentarse comouna masa dolorosa. Su tratamiento es quirúrgico, generalmente consisteen la extirpación del mismo. Caso clínico: Varón de 14 años que presenta tumoraciones dolorosas bilaterales en la cara dorsal de las manos. La ecografía confirma eldiagnóstico de EDBM. Debido a la sintomatología asociada, se decidetratamiento quirúrgico, con resección de ambas masas musculares. Comentarios: El EDBM constituye una causa poco frecuente dedolor a nivel de la muñeca, especialmente en población infanto-juvenil.El tratamiento quirúrgico ha demostrado un impacto significativo en lamejoría de la sintomatología que presentan estos pacientes.(AU)

Introduction: The extensor digitorum brevis manus (EDBM) isan accessory muscle of the dorsum of the hand that may appear as apainful mass. It is treated surgically, usually by excision of the muscle. Clinical case: 14-year-old male with bilateral painful masses onthe dorsal aspect of his hands. Ultrasound confirmed the diagnosis ofEDBM. Due to the associated symptoms, decision was made to conductsurgical treatment with resection of both muscle masses. Discussion: EDBM is an infrequent cause of wrist pain, especiallyin children and adolescents. Surgical treatment has proven to have asignificant impact on the improvement of the symptoms suffered bythese patients.(AU)

A Rare Case of Painful Hand Swelling.

Many conditions are known to cause chronic wrist pain, one of which is accessory muscles which can be easily overlooked as the cause of pain. Here we present a case of chronic wrist pain in a 33-year-old male who presented with painful dorsal unilateral right-hand swelling associated with increased activity. This patient was referred to the radiology department and was found to have an accessory muscle along the dorsal aspect of the wrist consistent with the extensor digitorum brevis manus muscle. The report includes the clinical presentation, radiologic findings, and management.

Finger abduction as a novel function of the extensor digitorum brevis manus muscle.

A 25-year-old female presented with a chronic scapho-lunate ligament injury with development of carpal instability requiring reconstruction. During a standard dorsal longitudinal mid-line approach to the carpus, an extensor digitorum brevis manus (EDBM) muscle was found taking its origin from the dorsal wrist capsule overlying the lunate with innervation from the posterior interosseous nerve (PIN). Electrical stimulation of the muscle belly demonstrated abduction of the middle finger. The EDBM is a rare anatomical variant of the extensor compartment of the wrist and may be encountered during surgical approaches. Where possible these variant muscles should be carefully dissected off underlying structures, preserved and repaired at the conclusion of a procedure to ensure no perceived functional deficit to the patient. We present a case of a previously undescribed EDBM muscle function of pure finger abduction with no extension and a surgical technique of preserving its origin. We propose that the middle finger variant of the EDBM should be re-named the extensor digitorum brevis medius to reflect our findings.

Extensor Digitorum Brevis Manus presenting as a symptomatic lump on the dorsum of the hand.

Lumps in the hand are a common presenting complaint in General Practice. We present the case of a 24-year-old male who presented to his General Practitioner with a painful lump in the dorsum of his right hand. He was referred to the sarcoma services where MRI and ultrasound examinations revealed an accessory Extensor Digitorum Brevis Manus muscle as the cause of the patient's symptoms. When patients present with a painful or discomforting lump in the dorsum of the hand during or after repetitive use, typically on flexion, a diagnosis of Extensor Digitorum Brevis Manus should be considered.

A rare bilateral variation on the dorsum of the hand: extensor digitorum brevis manus and extensor medii proprius.

A 78-year-old male cadaver showed bilateral anomalous muscles on the dorsum of the hand. An extensor digitorum brevis manus was noted on the dorsum of the right hand. It originated from the distal end of the radius and the radiocarpal joint ligaments and inserted into the metacarpophalangeal joint of the third digit. On the dorsum of the left hand, an extensor digiti medii proprius was identified. It originated from the distal third of the ulna near the extensor indicis proprius and the interosseous membrane and inserted into the metacarpophalangeal joint of the third digit. Awareness of these combined muscular variation would be helpful in understanding the identification of digital extensors and in requiring careful consideration for the reconstruction surgery of the hand.

A rare bilateral variation on the dorsum of the hand: extensor digitorum brevis manus and extensor medii proprius / 대한해부학회지

A 78-year-old male cadaver showed bilateral anomalous muscles on the dorsum of the hand. An extensor digitorum brevis manus was noted on the dorsum of the right hand. It originated from the distal end of the radius and the radiocarpal joint ligaments and inserted into the metacarpophalangeal joint of the third digit. On the dorsum of the left hand, an extensor digiti medii proprius was identified. It originated from the distal third of the ulna near the extensor indicis proprius and the interosseous membrane and inserted into the metacarpophalangeal joint of the third digit. Awareness of these combined muscular variation would be helpful in understanding the identification of digital extensors and in requiring careful consideration for the reconstruction surgery of the hand.

Extensor indicis proprius muscle and its variants together with the extensor digitorum brevis manus muscle: a common classification. Clinical significance in hand and reconstructive surgery.

PURPOSE: The extensor indicis proprius (EIP) is a muscle of the forearm that originates from the posterior surface of the ulna and the adjacent interosseous membrane and attaches to the index finger. Many anatomical variations of this muscle have been reported in the literature. The extensor digitorum brevis manus (EDBM) is a variant muscle found on the back of the wrist and hand. These muscle variants should be considered in the context of clinical syndromes and reconstructive hand surgery. The aim of the present study was to describe in detail the normal and variant anatomy of these muscles and propose new systematic classifications. MATERIALS AND METHODS: Formol-carbol-fixed Europid upper limbs (n = 176) were examined in the Department of Anatomy, Histology and Embryology at the Medical University of Sofia for variations of the EIP and occurrences of the EDBM. RESULTS: We found normal anatomy in 147 (84%) of the specimens examined and we measured the length and width of the muscle belly and tendon of the EIP. Variations of the EIP in the other 29 upper limbs (16%) included replacement of the EIP by an EIB, coexistence of the EIP and EIB, presence of accessory tendons, and additional muscles. CONCLUSIONS: Knowledge of anatomical variations of forearm muscles is important because they can cause clinical syndromes or have implications for reconstructive surgery, most often as tendon transfers in response to functional loss of other forearm muscles.

Extensor Digitorum Brevis Manus: A Comprehensive Review of this Variant Muscle of the Dorsal Hand.

The extensor digitorum brevis manus (EDBM) is a variant muscle located on the dorsum of the hand. This variant of the fourth compartment has often eluded preoperative diagnosis and led to unnecessary repeat visits to the operating room owing to its lack of notoriety. As a result, we aim to review the literature concerning the EDBM with respect to its embryology, comparative anatomy and variants, and clinical significance in an attempt to increase awareness and help in preoperative diagnosis and management. A total of 21 articles were reviewed. The results show that the EDBM often goes underdiagnosed and is frequently discovered incidentally in the operating room or in cadaveric dissections. There are multiple variations of the EDBM that, in certain instances, dictate the correct method of management. While there has been a reversal of opinions on which technique is the most popular at relieving symptoms caused by the EDBM, current arguments stand for retinacular release only when the EDBM serves as a sole extensor for one of the indices. In other instances where this is not the case, surgical excision of the EDBM proved to be the most effective at relieving symptoms.

Dorsal Wrist Ganglion Associated with Extensor Digitorum Brevis Manus: Case Report and Review of the Literature.

Aberrant accessory muscles are rare entities in the hand. The extensor digitorum brevis manus (EDBM) muscle is amongst them and may be seen in association with dorsal ganglion cysts. Distinguishing an EDBM muscle is relevant in the diagnostic consideration of a dorsal ganglion in order to facilitate and guide its proper treatment. To date, there have been only few reports of an EDBM in association with a dorsal ganglion cyst. We report our experience with an incidental intraoperative finding of an intramuscular EDBM dorsal ganglion cyst and follow with a literature review and guide to management.

Extensor Digitorum Brevis Manus / 대한정형외과학회잡지

Extensor digitorum brevis manus (EDBM) is a rare variation of the extensor muscle of the dorsum of the hand, which is found incidentally during surgery or magnetic resonance imaging (MRI). EDBM arises from the wrist capsule inferior to the extensor retinaculum, which frequently goes into the ulna side of the basis of the proximal phalanx between the 2nd and 3rd fingers. The aim of this report is evaluate to investigate the symptomatic mass on the dorsum of the hand and wrist using an image study (MRI or ultrasonography) to confirm whether it is a tumor or EDBM. Surgical excision was chosen as a treatment.

Extensor tendons and variations of the medial four digits of hand: a cadaveric study.

A total of 100 cadaveric limbs were dissected to study the anatomy of the forearm and hand extensor musculature. Four types of contributions to the index finger were found for the extensor indicis proprius (EIP), including one new type where the double tendons of the EIP inserts volar and radial to the extensor digitorum communis of the index finger (EDC-I). Four variant muscles were identified including the extensor medii proprius (EMP) (in five cadavers), extensor digitorum brevis manus (EDBM) (in one cadaver), extensor indicis et medii communis (EIMC) (in four cadavers) and extensor pollicis et indicis (EPI) (in four cadavers). The absence of the EIP in four cases was substituted by either the EIMC or the EPI. Two unpreviously published cases were found. In one hand, the variant EIMC was present along with the EPI. In another hand, both the EMP and the EDBM were present, and the EMP tendon inserted to the tendon of the EDBM. Awareness of the variations on the dorsum of the hand is essential for diagnosis, surgical planning and treatment of diseased hands.

Músculo extensor anómalo de la mano: "extensor digitorum brevis manus" / Anomalous extensor hand muscle: extensor digitorum brevis manus

En la región dorsal de la muñeca y la mano, se describen varios músculos accesorios o supernumerarios, que pueden actuar como simuladores de entidades patológicas y producir síntomas clínicos (gangliones, quistes sinoviales, etc.). El diagnóstico clínico es cada vez más accesible; la ecografía y la resonancia magnética han permitido conocer su naturaleza y extensión. La presencia de este músculo, por lo general, pasa desapercibida y no causa síntomas, aunque puede producir clínica de tumefacción y dolor en el carpo; se acentúa con la actividad, sobre todo, aquellas que requieran la extensión forzada de la muñeca y los dedos. Puede manifestarse bilateralmente en un tercio de los pacientes y la incidencia no difiere entre los sexos. Cuando los síntomas son graves, hay que recurrir al tratamiento quirúrgico que consiste en la resección completa del músculo o en la división del retináculo extensor; con ambas técnicas se obtienen buenos resultados; en algunos casos, se lo ha usado como colgajo para reconstruir lesiones tendinosas en otros niveles. Este músculo es muy poco frecuente; la revisión bibliográfica de este trabajo ayudaría a considerar esta patología a la hora de realizar diferentes diagnósticos diferenciales en la región de la muñeca y la mano.

In the dorsal region of the wrist and hand, various accessory and supernumerary muscles are described; they can act as simulators and produce clinical entities (ganglion, synovial cysts, etc.). The clinical diagnosis is increasingly accessible; ultrasound and magnetic resonance have allowed to evaluate their nature and extent. The presence of this muscle usually goes unnoticed without symptoms, but it can cause swelling and pain in the carp; it is accentuated with activities, especially those requiring the forced extension of the wrist and fingers. It can manifest bilaterally in one third of patients and the incidence did not differ between males and females. When symptoms are severe, surgical treatment is indicated with the complete resection of the muscle or the division of the extensor retinaculum; both techniques achieve good results; in some cases, it has been used as a flap to reconstruct tendon injuries at other levels. The frequency of this muscle is very low; our literature review will help to consider this condition among the various differential diagnoses in the region of the wrist and hand.

Extensor digitorum brevis manus: a raremuscle on the dorsum of the hand

The extensor digitorum brevis manus is one of the rare anatomic variations which occur on the dorsum of the hand. Only some 295 articles were found worldwide in an extensive bibliographic review carried out in 2003. This muscle was dissected bilaterally on a male corpse at the Human Anatomy Laboratory of the Morphophysiological Department of the “Faculty of Medical Sciences of Minas Gerais”. It is an elongated, small muscle, originating at the carpal bones and at the extensor retinaculum and inserting into one of the tendons of the finger’s extensor muscle. Even though it does not present an essential function in the movement of the fingers nor the hand, it can lead to pain when hypertrophied, creating the need for clinical or even surgical treatment.

Extensor digitorum brevis manus: A case of fourth-compartment syndrome.

The presence of an extensor digitorum brevis manus represents a variation of the normal anatomy of the fourth extensor compartment of the wrist. It usually presents as a swelling on the dorsum of the wrist and is often inaccurately diagnosed. An awareness of its existence and of its characteristic appearance on diagnostic imaging studies is the basis for diagnosis. Symptomatic cases require division of the extensor retinaculum or excision of the muscle, depending on subtype, while asymptomatic cases require no intervention.

La présence d'un muscle extenseur commun court des doigts représente une variation de l'anatomie normale de la loge du quatrième extenseur du poignet. D'ordinaire, cette manifestation prend la forme d'un œdème du dos du poignet. Elle est souvent mal diagnostiquée. La prise de conscience de son existence et de son apparence caractéristique à la visualisation diagnostique constitue le fondement du diagnostic. En présence de cas symptomatiques, il faut diviser le ligament annulaire ou exciser le muscle, selon le sous-type, tandis que les cas asymptomatiques n'exigent aucune intervention.