This composite educational image illustrates the clinical signs and laboratory findings of thalassemia intermedia. Panel A is a clinical photograph of a patient's torso showing massive abdominal distention. Yellow skin markings delineate the margins of significant hepatomegaly and massive splenomegaly, with the spleen extending from the left upper quadrant across the midline and deep into the pelvic region, occupying nearly the entire abdominal cavity. Panel B is a peripheral blood smear (light microscopy) demonstrating classic hematological abnormalities associated with thalassemia. The red blood cells exhibit marked microcytosis (small size) and hypochromia (central pallor), along with numerous target cells (codocytes) and irregularly contracted cells (schistocytes). These findings collectively highlight the physical manifestations of extramedullary hematopoiesis and chronic hemolytic anemia characteristic of advanced hemoglobinopathies.

Peripheral blood smear from a patient with known chronic lymphocytic leukemia (CLL) showing autoimmune hemolytic anemia (AIHA). Brightfield microscopy of Wright-Giemsa stained smear at 1000x (oil immersion) reveals two dominant cell populations: numerous small mature lymphocytes typical of CLL and red blood cells showing spherocytic deformation. A smudge cell is evident just left of center, a classical clue for CLL. Red cells display reduced central pallor consistent with spherocytes, indicating intravascular or extravascular hemolysis driven by autoantibodies. The background shows mild polychromasia and rare nucleated RBCs, consistent with a robust reticulocyte response; the corrected reticulocyte count in this case is markedly elevated (>7%). Platelets are not significantly abnormal. These features collectively support autoimmune destruction of erythrocytes in the setting of CLL. Diagnostic significance lies in recognizing AIHA as a common autoimmune complication in CLL, with a clinical picture of sudden Hb decline and compensatory erythropoiesis. Differential considerations include drug-induced hemolysis, other causes of hemolytic anemia, or marrow infiltration by CLL. Clinical correlation includes therapy implications (steroids, rituximab) and close monitoring of hemolysis markers. This image is a valuable teaching resource for hematology morphology, AIHA in CLL, and differential diagnosis in anemia.

Educational medical image panel consisting of a clinical photograph and a diagnostic pathology image illustrating physical and hematological findings of a hemoglobinopathy such as Hb E/beta-thalassemia. Panel A is a clinical photograph of a patient's abdomen showing a prominent bulge in the left upper quadrant and mid-abdomen, with a black arrow indicating the anterior notch of a massively enlarged spleen (splenomegaly). The overlying skin shows subtle striae or discoloration. Panel B is a peripheral blood smear (Leishman stain, 200x) showing significant red blood cell (RBC) dysmorphology. Key findings include target cells (codocytes) marked by black arrows, teardrop cells (dacrocytes) marked by blue arrows, and basophilic stippling within microcytic, hypochromic RBCs marked by yellow arrows. These visual markers are classic indicators of disordered erythropoiesis and hemoglobin synthesis abnormalities, providing a diagnostic bridge between clinical examination (splenomegaly) and laboratory hematopathology.

This composite image consists of clinical photographs and a diagnostic peripheral blood smear. Figure 1a (left) shows a pediatric patient with clinical signs including total alopecia (complete absence of scalp hair) and nail pitting affecting both hands and feet, characterized by small punctate depressions on the nail plates. Figure 1b (right) is a microscopic view of a peripheral blood smear demonstrating microangiopathic hemolytic anemia. Visible are numerous schistocytes—fragmented, irregular red blood cells including helmet cells and triangular forms—alongside some normal erythrocytes showing central pallor. The educational focus is on the multi-systemic manifestations of a medical condition, likely a microangiopathic process such as Hemolytic Uremic Syndrome (HUS) or similar systemic pathology, illustrating the correlation between dermatological signs (hair and nail changes) and hematological abnormalities (hemolysis and schistocytosis).

Histopathology: Bone marrow biopsy prepared for light microscopy shows diffuse infiltration by hairy cells rather than well-formed nodules. The marrow is often hypercellular in established disease but can be hypocellular in early stages, mimicking aplastic anemia. Hairy cells appear monotonous with oval nuclei and abundant clear cytoplasm that yields a characteristic fried egg morphology on H&E sections. In some cases, hair-like cytoplasmic projections (hairy indentations) are accentuated with specialized staining such as DBA.44 immunostain, supporting a hairy cell leukemia (HCL) diagnosis. The tumor cells may display spindled forms; the immunophenotype typically includes DBA.44 positivity, and cells may express CD11c, CD25, and CD103 on broader panels. Normal hematopoietic elements, particularly myeloid precursors, are reduced and can show dysplastic changes reminiscent of myelodysplastic syndrome. Plasma cells and mast cells may be mildly increased. Significant reticulin fibrosis is common, contributing to difficult marrow aspirates and making core biopsy essential to determine the extent of marrow replacement. Although marrow evaluation is informative, many cases of HCL can be diagnosed from peripheral blood smear and immunophenotyping alone; however, the biopsy provides baseline disease burden and a reference for assessing therapeutic response and fibrosis progression. This image exemplifies classic HCL marrow involvement with fried egg cells and conspicuous reticulin fibrosis.

This diagnostic image is a low-magnification light microscopy photomicrograph of a bone marrow trephine biopsy, likely stained with hematoxylin and eosin (H&E). The specimen exhibits marked hypocellularity, a hallmark of severe aplastic anemia. The hematopoietic space is predominantly occupied by clear, vacuolated adipocytes (fatty marrow), with a notable absence of normal myeloid, erythroid, and megakaryocytic cell lines. Eosinophilic (pink) trabecular bone spicules are visible at the periphery and interspersed within the marrow cavity, providing structural context. The clinical significance of this finding is the demonstration of bone marrow failure, where the functional marrow has been replaced by adipose tissue. The absence of infiltrative abnormal cells or significant fibrosis is a key negative finding for differentiating this from myelodysplastic syndromes or myelofibrosis.

Light microscopy of a bone marrow biopsy from hairy cell leukemia (HCL) shows diffuse infiltration by small to medium lymphoid cells with abundant clear cytoplasm and oval, occasionally reniform nuclei; the cytoplasm creates a fried egg appearance. Hairy projections may be highlighted by immunostaining and by DBA.44 positivity, along with CD11c, CD25, and CD103 markers. The marrow is commonly hypercellular in established disease, whereas early involvement may be hypocellular and mimic aplastic anemia. Prominent reticulin fibrosis is typical and can hinder aspirate yield, making core biopsy essential for assessing infiltration and baseline disease burden. Normal hematopoietic elements, especially the myeloid lineage, are reduced and may display dysplastic changes resembling myelodysplastic syndrome. Plasma cells and mast cells may be mildly increased. In some cases, hairy cells assume a spindle-shaped morphology. The neoplastic cells are typically monotonous with minimal prominent nucleoli, and cytoplasm may exhibit cytoplasmic processes. Unlike several small B-cell lymphomas, discrete cellular aggregates are uncommon, with diffuse replacement predominating. Immunohistochemistry and flow cytometry confirm the diagnosis via characteristic immunophenotype. Clinically, marrow involvement informs staging, prognosis, and treatment planning, though peripheral blood smear and immunophenotypic profiling often suffice for diagnosis. This image, captured at high magnification on a hematoxylin and eosin stained section, showcases classic hairy cell features.

This is a clinical photograph illustrating extensive cutaneous involvement associated with disseminated intravascular coagulation (DIC). Imaging modality: Digital in vivo skin photography. Anatomical location: distal leg region with a large, nonblanching violaceous to dark purple patch showing irregular, geographic margins and a central necrotic area bordered by a pinkish-red rim. The lesion displays nonpalpable purpura with surrounding erythema and edema. Visual cues include mottled purple discoloration, ecchymosis-like zones, and tissue necrosis consistent with microvascular thrombosis and hemorrhage. Pathophysiology of DIC involves systemic activation of coagulation pathways with consumption coagulopathy and formation of dermal microthrombi leading to ischemic necrosis. This image provides a clinical correlate for severe coagulopathy in the setting of sepsis or hemorrhagic shock and aids differential diagnosis against purpura fulminans, meningococcemia, cutaneous vasculitis, necrotizing cellulitis, calciphylaxis, and stasis ulcers. Clinical significance includes urgent coagulation testing (PT, aPTT, platelet count, fibrinogen, D-dimer), blood cultures, sepsis evaluation, and immediate management: treating the underlying cause, hemodynamic support, and appropriate blood product transfusion with careful consideration of anticoagulation per protocol. Educational use: dermatology, hematology, emergency medicine, and pathology training in recognizing DIC cutaneous manifestations. Recognition of these lesions accelerates triage, sepsis workup, and multidisciplinary care.

This medical pathophysiology diagram outlines the multifaceted mechanisms of 'Dengue Related Haemostatic Dysfunction'. The central heading branches into six key pathogenic pathways. On the left, a blood vessel illustration demonstrates Disseminated Intravascular Coagulation (DIC) with fibrin-platelet aggregates and trapped red blood cells. On the right, an anatomical liver illustration highlights hepatic dysfunction leading to reduced synthesis of clotting factors. The lower section details molecular and cellular interference: NS1 protein inhibiting prothrombin activation (shown as a hexameric molecular structure); increased IL-6 downregulating factor XII (illustrated via a signaling pathway map); Macrophage Migration Inhibitory Factor inducing platelet-activating factor (represented by an activated immune cell); and excessive Tissue Plasminogen Activator (TPA) causing hyperfibrinolysis, depicted as a microscopic view of fibrin degradation and clot dissolution. This infographic serves as an educational summary of how dengue virus proteins and host inflammatory responses collectively cause coagulopathy and thrombocytopenia.

A composite clinical imaging series demonstrating the progression and follow-up of a central nervous system complication of Chronic Myeloid Leukemia (CML). Panels A–C consist of non-contrast axial CT scans of the head. Panel A shows a large, hyperdense acute intracerebral hemorrhage (ICH) in the right frontal lobe with significant mass effect, peripheral vasogenic edema, and midline shift. Panel B (3 days post-first craniotomy) and Panel C (post-second craniotomy) demonstrate recurrent hyperdense hemorrhage in the surgical bed, accompanied by evidence of decompressive hemicraniectomy. Panels D–F are contrast-enhanced T1-weighted axial MRI scans taken one month later. These reveal multiple, small, nodular gadolinium-enhancing intracranial lesions (indicated by yellow arrows) located in the posterior fossa (cerebellum) and right frontal region. These findings represent intracranial involvement of immature myeloid cells (granulocytic sarcoma/chloroma) in the context of CML, illustrating the transition from acute hemorrhagic presentation to visible leukemic infiltration of the brain parenchyma and sulci.

This set of four ultra-widefield fundus photographs illustrates the ophthalmic manifestations of Chronic Myeloid Leukemia (CML) and its response to treatment. Panels A and B display the right and left eyes at presentation, showing florid Roth spots—characterized by retinal hemorrhages with central white spots—distributed across the posterior pole and periphery. There is also prominent peripheral perivascular sheathing, where retinal vessel walls appear thickened or encased in white material. Panels C and D show the same eyes four weeks post-treatment with tyrosine kinase inhibitors. There is a significant clinical improvement, evidenced by the near-complete resolution of the Roth spots and a marked reduction in perivascular sheathing. The comparison serves as a clinical timeline demonstrating the efficacy of systemic leukemia treatment on ocular leukemic infiltrates and associated retinopathy. Key educational concepts include the recognition of Roth spots as signs of systemic disease (leukemia, endocarditis, or severe anemia) and the importance of wide-field imaging in monitoring peripheral retinal vascular changes in hematologic malignancies.

Transmission electron microscopy image of bone marrow plasma cells in multiple myeloma, highlighting ultrastructural features of malignant plasmacytosis. The specimen is a bone marrow biopsy/aspirate subjected to TEM to reveal subcellular architecture at high magnification. The primary subject is a plasma cell characterized by a prominent, eccentrically placed nucleus with chunky, irregular clumped chromatin and abundant cytoplasm. Bi- or multinucleation is frequently observed in myeloma cells. The cytoplasm shows extensive rough endoplasmic reticulum organized in parallel lamellae, reflecting heavy immunoglobulin synthesis. Light gray, round to ovoid cytoplasmic inclusions known as Russell bodies are evident within the cytoplasm, representing condensed immunoglobulin within intact endoplasmic reticulum. The cellular borders are well defined, and there is sometimes distension of the ER cisternae near the perinuclear region. The image underscores hallmark features of malignant plasma cells in multiple myeloma and demonstrates both proliferative activity and high secretory load. Clinically, these ultrastructural findings correlate with a high monoclonal immunoglobulin production and marrow infiltration, informing prognosis and therapeutic decisions when integrated with light-chain studies and routine histology. This EM view complements light microscopy by providing evidence of intracellular organelle expansion and intracellular inclusions that are not discernible with conventional staining. Potential educational use includes teaching plasmacytosis, plasma cell neoplasia morphology, and EM-based diagnostic histopathology.

Imaging modality: Brightfield light microscopy of a Wright-Giemsa stained peripheral blood smear. The smear demonstrates marked rouleaux formation of red blood cells, with cells stacking in linear, coin-like columns typical of hypergammaglobulinemia. The background appears subtly bluish, reflecting increased serum proteins and altered stain uptake produced by monoclonal immunoglobulin (M-protein) in the plasma. Occasional circulating plasma cells are visible, consistent with plasma cell dyscrasia; in advanced myeloma this may progress to marked plasmacytosis or plasma cell leukemia. Note that rouleaux is not specific for plasma cell disorders and can occur with other states that raise immunoglobulin levels, such as systemic lupus erythematosus, chronic infections, and HIV. The combination of RBC rouleaux and blue background staining on Wright-Giemsa supports a workup for a monoclonal gammopathy; definitive diagnosis requires serum protein electrophoresis, immunofixation, free light chain assay, and bone marrow examination. Clinically, these findings correlate with increased plasma viscosity and potential hyperviscosity symptoms; they also influence automated hematology analyzer results and guide diagnostic sequencing in hematology-oncology. This image is valuable for education on rouleaux pathophysiology, differential diagnoses of gammopathy, and recognition of circulating plasma cells in blood. This image supports educational discussion in hematology and medical diagnostics. Useful for exam review, case conferences, and AI image recognition benchmarks.