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Variations of the Intercostobrachial Nerve- a Series of Case Reports

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Variations of the Intercostobrachial Nerve- a Series of Case Reports International J. of Healthcare and Biomedical Research, Volume: 03, Issue: 04, July 2015, Pages 114-116 Case report Variations of the Intercostobrachial Nerve- a series of case reports 1Dr. T. H. Dilip Kumar , 2Dr. K. V. P. Suriyakumari 1Post graduate student, Department of Anatomy, Sri Manakula Vinayagar Medical College and Hospital, Pondicherry 2Professor and Head, Department of Anatomy, Sri Manakula Vinayagar Medical College and Hospital, Pondicherry Corresponding author: Dr. K. V. P. Suriyakumari , Professor and Head , Department of Anatomy, Sri Manakula Vinayagar Medical College and Hospital, Pondicherry Abstract: The intercostobrachial nerve is the lateral cutaneous branch of the second intercostal nerve. The following series of case reports presents variations of the intercostobrachial nerve found during dissection of two formalin fixed cadavers. The knowledge of intercostobrachial nerve and its variations is essential for surgeries of the thoracic wall and axilla such as modified radical mastectomy. Keywords: Intercostobrachial nerve, Modified radical mastectomy, Post mastectomy pain syndrome Introduction: intercostobrachial nerve was identified in the second The lateral cutaneous branch of intercostal nerves intercostal space superficially. divides into an anterior and posterior branch. The nerve was traced till the postero-medial aspect of However, the second intercostal nerve does not the upper arm. divide like the other nerves and this undivided lateral Case 1 b) PMA-Pectoralis Major, PMI-Pectoralis cutaneous branch of the second intercostal nerve is Minor , SA-Serratus Anterior,ICBN- called as the Intercostobrachial nerve. The Intercostobrachial nerve,S-Superior intercostobrachial nerve pierces the I-Inferior, M-Medial, L-Lateral intercostalisexternus and serratus anterior, crosses the Case 1 b) ICBN-Intercostobrachial nerve, SB- Short axilla to reach the medial side of the arm and branch, LB- Long branch communicates with a branch from the medial Case 2.ICBN-Intercostobrachial nerve, PMA- brachial cutaneous nerve. The intercostobrachial Pectoralis major, PMI-Pectoralis Minor, M-Medial, nerve then pierces the fascia and supplies the skin of L-Lateral, S- Superior, I-Inferior the upper half of the medial and posterior part of the Discussion: arm, communicating with the posterior brachial Cunnick et al. described the anatomy of the cutaneous branch of the radial nerve. intercostobrachial nerve as highly variable The intercostobrachial can also be a cause of referred [1] .Hegrouped it into the six variations. The following cardiac pain. Injury to the intercostobrachial nerve are the anatomical variations of intercostobrachial during radical mastectomy is one of the commonest nerve observed during surgery [1] . causes of post mastectomy pain syndrome. • Type 1 – arises from T2 alone and does not give off Case report: any branches. During routine dissection in two male cadavers, • Type 2 – arises from T2 alone and divides into a around 50 years old we found out the following large main trunk and a much smaller branch. variation. After removing the skin, the 114 www.ijhbr.com International J. of Healthcare and Biomedical Research, Volume: 03, Issue: 04, July 2015, Pages 114-116 • Type3 – arises T2 alone and divides equally into two Conclusion: branches It is essential to keep in mind the normal course of • Type 4 – formed by two equal-sized branches from the intercostobrachial nerve along with its variations, T1 and T2 nerves. No significant branches during its in order to avoid misdiagnosis and iatrogenic course through the axilla. complications during surgeries related to that • Type5 – arises from two separate T2 radicals to form particular area. a single nerve which does not give off branches in the axilla. • Type 6 – arises from T2 alone and divides into a large main trunk and at least two smaller branches. According to the above classification, in the present study; Case 1 a does not belong to any of the variations mentioned in the classification.Case 1 b represents type 2 variation. Case 2 represents type 3 variation. Figure 1: Depicting Case (1a); PMA- Pectoralis Satyajeet V et al conducted a retrospective study in Major, PMI- Pectoralis Minor, DL- Deltoid, SA- 2007, in 42 breast cancer patients with the mean age Serratus Anterior, ICBN- Intercostobrachial nerve, group of 51-53 years [2] .According to the above M- Medial, L- Lateral classification:Type 2 variation was 19.4% and Type 3 variation was only 4.7% In Modified Radical Mastectomy and Axillary clearance of lymph nodes, the nerve may be sacrificed by the surgeons as an iatrogenic error. In some cases, where the medial cutaneous nerve of arm is absent, the intercostobrachial nerve substitutes the medial cutaneous nerve of arm. In such instances if Figure 2: Depicating Case (1b); PMA- Pectoralis ICBN is cut the patient will suffer from complete Major, PMI- Pectoralis Minor, SA- Serratus loss of sensation over the medial side of the arm. Anterior, ICBN- Intercostobrachial nerve, S- Paredes et al. found that patients who underwent Superior, I- Inferior, M- Medial, L- Lateral Modified Radical Mastectomy where the intercostobrachial nerve was sectioned near the chest wall, presented commonly with paresthesia rather than pain [3] . Assa J et al. noted that the preservation of the intercostobrachial nerve during radical mastectomy as a treatment for breast cancer was beneficial. Figure 3: Depicting Case (1b); ICBN- Patients in whom the said nerve was preserved were Intercostobrachial nerve, SB- Short branch, LB- free from throbbing and paraesthesia sensations [4] . Long branch 115 www.ijhbr.com International J. of Healthcare and Biomedical Research, Volume: 03, Issue: 04, July 2015, Pages 114-116 Figure 4: Depicting Case 2; ICBN- Intercostobrachial nerve, PMA- Pectoralis Major, PMI- Pectoralis Minor, M- Medial, L- Lateral, S- Superior, I- Inferior References: 1. Cunnick GH, Upponi S, Wishart GC: Anatomical variants of the intercostobrachial nerve encountered during axillary dissection. The Breast 2001;10:160-2. 2. Satyajeet V, Bhargava R, Yadav GD, Singh RK, Maurya RK, Shanker P, Evaluation of the role of preservation of the intercostobrachial nerve on the post mastectomy pain syndrome in breast cancer patients of North India, The Internet Journal of Surgery 2010;23(2):1528-42. 3. Paredes J, Puente J, Potel J. Variations in sensitivity after sectioning the intercostobrachial nerve. American Journal of Surgery 1990;160:525-8. 4. Assa, J. (1974), The intercostobrachial nerve in radical mastectomy. J. Surg. Oncol., 6: 123–126. doi: 10.1002/jso. 116 www.ijhbr.com .
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