Peripheral blood smear prepared from a patient with suspected plasma cell leukemia (PCL) was examined by bright‑field light microscopy after Wright‑Giemsa staining. The smear shows several circulating plasma‑cell–like elements, including four conspicuous proplasmacytes with dispersed nuclear chromatin and prominent nucleoli, as indicated by arrows in the original figure. In addition, background erythrocytes exhibit rouleaux formation, a common feature in paraproteinemic states. The cells display eccentrically placed nuclei with pronounced basophilic cytoplasm and a coarse chromatin pattern; occasional cells show a perinuclear clearing (Golgi rim) suggestive of plasmacytic differentiation. Immunoglobulin light‑chain restriction is not determined on this smear alone but flow cytometry or immunohistochemistry would typically confirm clonal plasma cells. Relative proportions indicate that neoplastic plasma cells constitute a substantial fraction of leukocytes, consistent with plasma cell leukemia rather than reactive plasmacytosis. PCL is an aggressive myelomatous process often presenting with cytopenias, organomegaly, and sometimes lymphadenopathy; prognosis is poor, and treatment responsiveness is limited. This image illustrates characteristic morphologic features used for differential diagnosis against multiple myeloma, Waldenström macroglobulinemia, and other causes of plasmacytosis. Clinically relevant keywords include plasma cells, rouleaux, Wright‑Giemsa stain, 100X oil, peripheral blood, leukemia, myeloma, and hematologic malignancy.

Peripheral blood smear from a patient with suspected chronic lymphocytic leukemia (CLL) shows a predominance of small, mature-appearing lymphocytes with scant cytoplasm and clumped nuclear chromatin, accompanied by fragile cells that readily disrupt during smear preparation, producing numerous smudge or basket cells visible on the slide. The image depicts a single smudge cell in the upper right, with numerous small darkly staining lymphocytes occupying the field. The smear was prepared with Wright-Giemsa stain and examined under light microscopy at high magnification (approximately 1000x total magnification with oil immersion). Clinically, CLL is defined by absolute mature lymphocytosis of ≥5.0 × 10^9/L sustained for ≥3 months, often asymptomatic and detected incidentally on complete blood count. Morphology alone is insufficient for diagnosis; immunophenotyping showing co-expression of CD5, CD19, CD23 with weak surface immunoglobulin and light chain restriction supports CLL diagnosis. Smudge cells result from fragile leukemic cells and reflect underlying cytoskeletal fragility, though they are not specific. The image illustrates typical features: monomorphic lymphocytes, scant cytoplasm, condensed chromatin, and absent prominent nucleoli. This finding has diagnostic significance, guiding further workup, including flow cytometry, cytogenetics, and molecular studies, to distinguish CLL from other chronic lymphoproliferative disorders such as small lymphocytic lymphoma (SLL), mantle cell lymphoma, prolymphocytic leukemia, and reactive lymphocytosis.

A composite medical image featuring microscopic and clinical findings associated with Acute Promyelocytic Leukemia (APL) and its treatment complications. Panels (a) and (b) show Wright-Giemsa stained light microscopy images: (a) a peripheral blood smear with scattered red blood cells and rare large atypical promyelocytes, and (b) a hypercellular bone marrow aspirate demonstrating a dense infiltration of blast cells with high nuclear-to-cytoplasmic ratios and prominent purple staining. Panels (c) through (f) illustrate dermatological manifestations consistent with exfoliative dermatitis and onychomadesis likely secondary to All-Trans Retinoic Acid (ATRA) therapy. (c) and (d) show the plantar surfaces of the feet with extensive, sheet-like desquamation and underlying erythema. (e) displays bilateral palmar exfoliation with large flaps of peeling epidermis. (f) shows the dorsal aspect of both hands with nail bed changes including yellow discoloration and signs of proximal nail plate separation (onychomadesis). The educational focus is the correlation between hematological malignancy and rare cutaneous drug reactions during induction chemotherapy.

Peripheral blood smear prepared with Wright-Giemsa stain and examined under brightfield illumination using a 100× oil immersion objective reveals a single large plasma cell among a field of mature erythrocytes. The plasma cell displays features typical of clonal plasma cells: basophilic cytoplasm, an eccentrically placed round nucleus, and a conspicuous perinuclear hof; background shows rouleaux formation of red cells. This image exemplifies hematologic involvement by a plasma cell dyscrasia. In plasma cell leukemia, circulating plasma cells constitute more than 20% of leukocytes, a hallmark distinguishing it from conventional multiple myeloma, although both conditions share monoclonal plasma cell proliferation. The presence of circulating plasma cells is associated with younger patient age, higher incidence of anemia, thrombocytopenia, organomegaly, and possible lymphadenopathy; however lytic bone lesions may be less common. Immunophenotypic patterns often include lack of CD56 expression relative to myeloma. Clinically, this morphological finding warrants confirmation with complete blood count, peripheral smear review, quantitative plasma cell percentage, serum protein electrophoresis, and immunofixation to identify monoclonal immunoglobulin isotype (IgD/IgE or light-chain predominance). Early detection of circulating plasma cells supports prognosis assessment and guides therapy decisions in plasma cell dyscrasia management and monitoring, including risk stratification and treatment response evaluation for practice in clinics.

This composite educational infographic illustrates the diagnostic workup and progression of extramedullary manifestations (EM) of Acute Myeloid Leukemia (AML) in a 25-year-old patient. Panel (a) contains a central anatomical diagram showing the chronicity and location of four EM sites: (1) mediastinum, (2) duodenum, (3) skin (chloroma), and (4) retroperitoneum. Arrows point to corresponding hematoxylin and eosin (H&E) stained histopathology images for each site, demonstrating myeloid blasts and varying cellular density. The mediastinal and retroperitoneal tumors are shown being sampled via CT-guided biopsy, the duodenal tumor via endoscopy, and the chloroma via punch biopsy. Panel (b) provides diagnostic imaging correlation: (b1) 18FDG-PET/CT showing a hypermetabolic mediastinal mass, (b2) a duodenoscopy photograph revealing a friable, obstructive mass, and (b4) an 18FDG-PET/MRI depicting retroperitoneal disease. The visual summarizes the complex clinical course of multi-site extramedullary relapse despite bone marrow remission, emphasizing the role of integrated imaging and histological confirmation in AML management.

Two-part clinical photograph showing cutaneous manifestations of leukemia cutis in a patient with Acute Myeloid Leukemia (AML). Panel A presents a wide-angle view of the lower extremities, specifically the thighs, showing two isolated, discrete erythematous papules. Panel B provides a high-magnification close-up of a single lesion. The lesions are characterized as smooth-surfaced, rounded, and infiltrated (hardened) papules with a reddish, erythematous hue. They are well-demarcated from the surrounding healthy skin. These findings represent a recurrence of systemic leukemia following an allogeneic bone marrow transplant (BMT). The imagery illustrates the typical clinical presentation of extramedullary leukemic infiltration, which can be polymorphic and non-pathognomonic, requiring clinical correlation and biopsy for definitive diagnosis. The educational focus is on identifying skin-colored to erythematous papulonodular lesions as a sign of systemic hematologic malignancy progression or relapse.

This high-magnification light microscopy image shows an H&E stained tissue section documenting an extramedullary myeloid tumor (myeloid sarcoma) composed of immature myeloid precursors arranged in diffuse sheets. The cellular population includes myeloblasts with high nuclear-to-cytoplasmic ratio, fine nuclear chromatin, prominent nucleoli, and frequent mitotic figures, accompanied by promyelocytes and maturation to myelocytes in variable proportions. Cytoplasm is scant to moderate and can contain occasional cytoplasmic granules; rod-shaped inclusions (Auer rods) may be seen in scattered blasts. The architectural pattern lacks normal tissue stratification, with cohesive clusters and dispersed cells infiltrating the stroma, consistent with an extramedullary granulocytic tumor. The image corresponds to a histopathology specimen most often obtained from soft tissue, lymph node, skin, or other extramedullary sites in patients with or without overt bone marrow involvement. Clinically, myeloid sarcoma is diagnostic of acute myeloid leukemia (AML) and often precedes or heralds AML relapse; immunohistochemical profiling (MPO, CD34, CD117, CD43, lysozyme) and cytogenetic/molecular testing are essential for classification and prognosis. Potential diagnostic significance includes associations with AML subtypes and recurrent translocations (e.g., t(8;21), inv(16), 11q23). This image is valuable for educational illustration of AML-related solid tumors, hematopathology education, differential diagnosis with lymphoma or metastatic carcinoma, and correlation with systemic hematologic disease and treatment planning.

A diagnostic microphotograph of a peripheral blood interphase cell from a patient with Chronic Myeloid Leukemia (CML), analyzed via Fluorescence In Situ Hybridization (FISH). The image demonstrates an atypical BCR-ABL1 translocation pattern using a dual-color, dual-fusion probe. Against the dark blue DAPI-stained nuclear background, four distinct fluorescent signals are visible. The observed configuration is classified as 1F1G2R: one orange/yellow fusion signal (representing the BCR-ABL1 hybrid on the derivative chromosome 22), one green signal (representing the native BCR locus on chromosome 22), and two red signals (representing the native ABL1 locus on chromosome 9). This atypical pattern deviates from the standard 2F1G1R fusion signal usually seen in Philadelphia chromosome-positive cells, indicating clonal evolution or complex chromosomal rearrangements. This image serves as an educational example of cytogenetic variability in hematologic malignancies and the use of FISH for monitoring molecular response in patients undergoing tyrosine kinase inhibitor (TKI) therapy like imatinib.

This composite figure presents research data on Chronic Myeloid Leukemia (CML) development in wild-type (Wt) and Sipa1 knockout (Sipa1-/-) mice following Bcr-Abl+ hematopoietic progenitor cell (HPC) injection. Panel (a) displays Kaplan-Meier survival curves showing that Sipa1-/- mice are completely resistant to CML in unirradiated conditions (100% survival), while gamma-irradiation abolishes this resistance. Panel (b) provides quantitative and visual evidence of disease progression: Wt mice exhibit massive splenomegaly (spleen weights 0.4-0.8g) and high peripheral blood GFP+ leukemic cell proportions (~80-90%), whereas Sipa1-/- mice maintain normal spleen weights (~0.1g) and negligible circulating leukemic cells. Clinical photographs show the striking morphological difference between the enlarged, dark-red spleens of Wt mice and the normal-sized spleens of Sipa1-/- mice. Panel (c) shows survival curves based on varying intervals after irradiation, indicating that the host resistance in Sipa1-/- mice is radiosensitive and requires several months to recover. This content illustrates the role of the host microenvironment and Sipa1 in leukemia progression and immune-mediated rejection.

This diagnostic image displays a fluorescence in situ hybridization (FISH) analysis of human bone marrow cells, used primarily for detecting the BCR-ABL1 gene fusion associated with Chronic Myeloid Leukemia (CML). The image shows two blue-stained nuclei (DAPI) against a dark background. On the left, a larger metaphase cell exhibits a normal signal pattern with two distinct cyan/green signals and two distinct red signals (2G2R), representing the normal location of the ABL1 and BCR genes on their respective chromosomes. On the right, a smaller interphase cell demonstrates a fusion signal where a red and a cyan/green signal overlap or are closely apposed, indicative of a chromosomal translocation. This visual is a key educational tool for demonstrating molecular cytogenetics, specifically the dual-color, dual-fusion probe technique used in hematopathology to identify the Philadelphia chromosome.