case_images: PMC11654242_01
case_images: PMC11654242_02
case_images: Peripheral blood smear, RAL Stainer MCDh, 1000x. A: Sample from Patient 1 collected three days after admission presenting with erythrocyte clusters in the Rouleau formation. B: Sample from Patient 1 after repeated collection and incubation at 37  C for 60 minutes without showing erythrocyte clusters. Photos are originally by the author.
case_images: bm-35-1-011002-f1.jpg
case_images: PMC11654242_02_bm-35-1-011002-f1.jpg
case_images: f1
case_images: When the blood smear was examined under the optical microscope (Olympus BX41, Olympus, Tokyo, Japan), clusters of RBCs were revealed in each field, in the Rouleau formation (Figure 1A). Moreover, the peripheral blood smear did not contain erythrocyte clusters (Figure 1B).