Presse Med. al.11 the decrease in the sensitivity may be due to inadequate activation of T-helper-2 lymphocytes, with the consequent reduction in the peripheral expression of immunoglobulins. In our XCT 790 case, the lack of the diagnosis suspicion was responsible for not testing the serologic exam. However, once the diagnosis was established, the serological study was performed, which was positive. Treatment-wise, surgery is the best option, always performed with a large margin of safety due to the high risk of relapse, regardless of the site of the lesion. Depending on the location and the relationship with vital structures, this will determine the prognosis.10 Nevertheless, minimally invasive approaches are currently being considered, as the laparoscopy and the PAIR (puncture, aspiration, injection, and reaspiration).12 Some authors consider the preoperative treatment with benzimidazole derivatives to be fundamental, and likewise for 3 more months postoperatively.3 In our case, the preoperative pharmacological treatment was not considered due to the lack of diagnostic suspicion. The accidental cyst injury during XCT 790 the surgical procedure did not cause any harm due to the absence of viability of the parasite. The convenience of preoperative treatment, together with the risk of rupture of the cyst during surgery with the implications that it entails, highlights the importance of considering the diagnosis of hydatid cyst in the differential diagnosis of this type of lesion for an optimal preoperative study and appropriate therapeutic management (especially in endemic regions). Footnotes How to cite: Garca-Tirado J, Allu-Caba?uz M, Mu?oz-Gonzlez N, Viso-Soriano MJ, Marquina-Ib?ez I. Cystic lesion of pectoralis minor muscle: learning from mistakes. Autops Case Rep [Internet]. 2019;9(2):e20180780. https://doi.org/10.4322/acr.2018.078 The authors retain an informed consent document signed by the patient, and the manuscript is in accordance with the requirements of the institutional ethics committee. Financial support: None REFERENCES 1. Merkle EM, Schulte M, Vogel J, et al.. Musculosketal involvement in cystic echinococcosis: report of eight cases and review of the literature. AJR Am J Roentgenol. 1997;168(6):1531-4. 10.2214/ajr.168.6.9168719. [PubMed] [CrossRef] [Google Scholar] 2. Ito A, Budke CM. The XCT 790 echinococcoses in Asia: the present situation. Acta Trop. 2017;176:11-21. 10.1016/j.actatropica.2017.07.013. [PubMed] [CrossRef] [Google Scholar] 3. Daali M, Mouse monoclonal antibody to CaMKIV. The product of this gene belongs to the serine/threonine protein kinase family, and to the Ca(2+)/calmodulin-dependent protein kinase subfamily. This enzyme is a multifunctionalserine/threonine protein kinase with limited tissue distribution, that has been implicated intranscriptional regulation in lymphocytes, neurons and male germ cells Hssaida R. Lhydatidose musculaire: 15 cases. Presse Med. 2000;21(29):1166-9. [PubMed] [Google Scholar] 4. Martin J, Marco V, Zidan A, Marco C. Hydatid disease of the soft tissues of the lower limb: findings in three cases. Skeletal Radiol. 1993;22(7):511-4. 10.1007/BF00209098. [PubMed] [CrossRef] [Google Scholar] 5. Marzouki A, Naam A, Abdulrazak S, Soumar B, Lahrach K, XCT 790 Boutayeb F. Musculoskeletal Echinococcus infection as a rare first presentation of hydatid disease: case report. Patient Saf Surg. 2017;11(21):1-5. 10.1186/s13037-017-0136-y. [PMC free article] [PubMed] [CrossRef] [Google Scholar] 6. Vasilevska V, Zafirovski G, Kirjas N, et al.. Imaging diagnosis of musculoskeletal hydatid disease. Prilozi. 2007;28(2):199-209. [PubMed] [Google Scholar] 7. Torcal J, Navarro-Zorraquino M, Lozano R, et XCT 790 al.. Immune response and production of cytokines in patients with liver hydatidosis. Clin Exp Immunol. 1996;106(2):317-22. 10.1046/j.1365-2249.1996.d01-843.x. [PMC free article] [PubMed] [CrossRef] [Google Scholar] 8. Brunetti E, Kern P, Vuitton DA. Expert consensus for the diagnosis and treatment of cystic and alveolar echinococcosis in humans. Acta Trop. 2010;114(1):1-16. 10.1016/j.actatropica.2009.11.001. [PubMed] [CrossRef] [Google Scholar] 9. Brunetti E. Echinococcosis Hydatid Cyst Workup. Laboratory Studies. New York: Medscape, LLC; 2018. [cited 2019 Dec 27]. Available from: https://emedicine.medscape.com/article/216432-workup [Google Scholar] 10. Torcal J, Garca-lvarez F, Salinas JC, et al.. Hidatidosis muscular primaria. Cir Esp. 2002;72(3):147-51. 10.1016/S0009-739X(02)72029-0. [CrossRef] [Google Scholar] 11. Rigano R, Profumo E, Ioppolo S, Notargiacomo S, Teggi A, Siracusano A. Cytokine patterns in seropositive and seronegative patients with Echinococcus granulosus infection. Immunol Lett. 1998;64(1):5-8. 10.1016/S0165-2478(98)00072-8. [PubMed] [CrossRef] [Google Scholar] 12. Chen X, Cen C, Xie H, Zhou L, Wen H, Zheng S. The comparison of 2 new promising weapons.