Gallery myelocyte images: illustrations and micrographs. All credits and licenses listed. Click a picture to see it large; click it again to open its paper. The pictures by method and the papers by section are in the library .
Micrographs Myelocyte on bone marrow preparation, Giemsa stain. Normal morphology: round nucleus, pale cytoplasm. Prof. Osaro Erhabor · CC BY-SA 4.0
source Acute promyelocytic leukemia (APL): Wright-Giemsa and MPO staining of promyeloblasts with Auer rods (arrows). The myelocyte's antecedent stage, arrested in APL. Ru YX, Dong SX, Liu J, Eyden B. Development of Auer bodies from giant inclusions associated with rough endoplasmic reticulum in acute promyelocytic leukemia. Blood Sci. 2023;5:111-117. PMID: 37228776 · CC BY 4.0
PMID 37228776 · fig. Figure 2 Trilineage hematopoiesis in bone marrow: erythroid, myeloid, and megakaryocytic precursors including myelocyte-stage cells. Mikael Haggstrom M.D. · CC0
source (A) Bone marrow cytomorphology by bone marrow aspirate smear. (B) Karyotype of bone marrow. (C) FISH probe detection of myeloid sarcoma biopsies. (D) FISH probe detection of bone marrow aspirate. Du Y, Yang K, Ling Y, Zhang Y, Gong Y. A case report of acute promyelocytic leukemia with myeloid sarcoma of the lumbar spine and literature review. Front Med (Lausanne). 2024;11:1507716. PMID: 39911670 · CC BY
PMID 39911670 · fig. FIGURE 2 Radiologic, histopathologic, cytologic, and bone marrow findings (A) Contrast-enhanced chest CT demonstrates a large mass in the right hilar region (red arrow), accompanied by a large right-sided malignant pleural effusion (yellow arrow) and significant pleural thickening (blue arrow). (B) Immunohistochemical staining of the pleural biopsy specimen reveals strong nuclear positivity for TTF-1 in tumor cells (brown staining, red arrows), confirming an origin of lung adenocarcinoma. (C) Pleural effusion cytology (H&E stain) reveals clusters of adenocarcinoma cells against a hemorrhagic background, exhibiting enlarged, hyperchromatic nuclei and marked atypia (blue and yellow arrows). (D) Bone marrow smear demonstrates marked granulocytic hyperplasia. Myeloblasts (red arrow), plasma cells (blue arrow), and mature eosinophils (yellow arrow) are visible, features consistent with a paraneoplastic leukemoid reaction. CT: computed tomography; TTF-1: thyroid transcription factor-1; H&E: hematoxylin and eosin Duan Y, Yang Y, Yu H, Zhang C, Wang Y, Ruan M et al. Paraneoplastic Leukemoid Reaction in Lung Adenocarcinoma With Multi-lineage Granulocytic Abnormalities and Eosinophilic Pleural Effusion. Cureus. 2025;17:e97404. PMID: 41431550 · CC BY 4.0
PMID 41431550 · fig. Figure 2 Bone marrow aspirate, showing normal trilineage hematopoiesis: myelomonocytic cells (an eosinophil myelocyte marked), erythroid cells (an orthochromatic erythroblast marked), and megakaryocytic cells. Mikael Haggstrom M.D. · CC0
source /images/myelo/eosinophilic-myelocyte-cml-1.jpg
Eosinophilic myelocyte in chronic myeloid leukemia (CML). Wright-Giemsa stain; the large nucleus and prominent eosinophilic granules mark the myelocyte stage. Laboratorio microscopico, Wikimedia Commons · CC BY-SA 4.0
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Myelocyte surrounded by erythrocytes on a peripheral blood smear. The round nucleus and pale cytoplasm identify the myelocyte stage. El*Falaf, Wikimedia Commons · CC BY-SA 3.0
source /images/myelo/myelocyte-lymphocyte-leukocytosis-1.jpg
Myelocyte (large cell, upper left, with loose nucleus) alongside a lymphocyte on a peripheral blood smear from a patient with neutrophilic leukocytosis and left shift (promyelocytes, myelocytes, metamyelocytes and band forms in the blood). DaFerRod, Wikimedia Commons · CC BY-SA 4.0
source /images/myelo/neutrophilic-myelocyte-cml-1.jpg
Neutrophilic myelocyte in chronic myeloid leukemia (CML). The round nucleus with condensing chromatin and secondary granule accumulation mark this as the myelocyte stage of the neutrophil series. Laboratorio microscopico, Wikimedia Commons · CC BY-SA 4.0
source /images/myelo/promyelocyte-marrow-smear-1.jpg
Promyelocyte on a bone marrow smear. The large cell with prominent nucleolus and abundant primary (azurophilic) granules marks the stage immediately upstream of the myelocyte. Bobjgalindo, Wikimedia Commons · CC BY-SA 4.0
source /images/myelo/metamyelocyte-1-1.jpg
Metamyelocyte on a blood smear. The kidney-shaped indented nucleus distinguishes the metamyelocyte from the round-nucleus myelocyte upstream. Wright-Giemsa stain. El*Falaf, Wikimedia Commons · CC BY-SA 3.0
source /images/myelo/metamyelocyte-2-1.jpg
Metamyelocyte on a blood smear (second example). The horseshoe-shaped nucleus and secondary granule-rich cytoplasm mark the stage between the myelocyte and the band neutrophil. El*Falaf, Wikimedia Commons · CC BY-SA 3.0
source /images/myelo/band-neutrophil-1-1.jpg
Band-form neutrophil in a Wright-stained peripheral blood smear. The unsegmented curved nucleus and secondary granules mark the stage immediately downstream of the metamyelocyte. Ajay Kumar Chaurasiya, Wikimedia Commons · CC BY-SA 4.0
source /images/myelo/band-neutrophil-2-1.jpg
Band neutrophil on a stained blood smear. The non-segmented band nucleus and pale cytoplasm with specific granules are the defining features of this postmitotic stage. Bobjgalindo, Wikimedia Commons · CC BY-SA 4.0
source Illustrations Normal neutrophils in (A)-(D), showing developmental stages of myeloblasts: myeloblasts (A), promyelocytes (B), myelocytes (C) to segmented granulocytes (D), x5k. (E)-(H) Positive myeloperoxidase reactivity of primary granules, x5k. Ru YX, Dong SX, Liu J, Eyden B. Development of Auer bodies from giant inclusions associated with rough endoplasmic reticulum in acute promyelocytic leukemia. Blood Sci. 2023;5:111-117. PMID: 37228776 · CC BY 4.0
PMID 37228776 · fig. Figure 1 Granulocytic maturation series: myeloblast through segmented neutrophil, with nucleus shape, size range, granule types, and N:C ratio. The myelocyte stage (center, outlined). myelo.site illustration, after Bainton DF, Ullyot JL, Farquhar MG. The development of neutrophilic polymorphonuclear leukocytes in human bone marrow. J Exp Med. 1971;134:907-34. PMID: 4106490 · CC BY-SA 4.0
PMID 4106490 · fig. after Figures 1-8