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Due to difficulty in diagnosis, it is suggested that an appropriate panel of immunohistochemical marker studies be performed in conjunction with clinical correlation to avoid misleading diagnosis and improper treatment of patients. We report an interesting case of a 49-year-old man with a diagnosis of acute myelogenous leukaemia. He had undergone allogeneic peripheral blood stem cell transplantation, achieved complete molecular remission and later relapsed with myeloid sarcoma of the testis.<\/jats:p>","DOI":"10.1136\/bcr-2020-240820","type":"journal-article","created":{"date-parts":[[2022,3,18]],"date-time":"2022-03-18T11:25:56Z","timestamp":1647602756000},"page":"e240820","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Testicular myeloid sarcoma: a relapse of acute myeloid leukaemia after allogeneic peripheral blood stem cell transplantation- a rare presentation"],"prefix":"10.1136","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3004-0164","authenticated-orcid":false,"given":"Shanawaz","family":"Alam","sequence":"first","affiliation":[{"name":"Urology, Sri Ramachandra Medical College and Research Institute, Chennai, Tamil Nadu, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Velmurugan","family":"Palaniyandy","sequence":"additional","affiliation":[{"name":"Urology, Sri Ramachandra Medical College and Research Institute, Chennai, Tamil Nadu, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chandru","family":"Thirunavukkarasu","sequence":"additional","affiliation":[{"name":"Urology, Sri Ramachandra Medical College and Research Institute, Chennai, Tamil Nadu, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Natarajan","family":"Kumaresan","sequence":"additional","affiliation":[{"name":"Urology, Sri Ramachandra Medical College and Research Institute, Chennai, Tamil Nadu, India"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2022,3,18]]},"reference":[{"key":"2025082708015944000_15.3.e240820.1","first-page":"790","article-title":"Extramedullary myeloid cell tumors. 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