Gross pathology specimens of a human spleen demonstrating focal and diffuse features of a splenic abscess. Panel A displays a side-view of the dark-red, inflamed splenic capsule with a localized area of purulent exudate (pus formation), indicated by a blue arrow. The pus appears as a pale, off-white, viscous material extruding from a disrupted focal point on the diaphragmatic surface. Panel B shows the splenic parenchyma in a late stage of inflammation, characterized by a predominantly dark red and irregular surface. A blue arrow in Panel B points to a region of severe tissue disruption, consistent with necrosis and parenchymal liquefaction, where the normal splenic architecture is lost and replaced by amorphous, friable tissue. This comparison illustrates the progression from localized abscess formation to widespread inflammatory necrosis within the organ, relevant for surgical pathology and infectious disease education.

Gross pathology photograph of the scrotal contents after dissection shows pronounced inflammatory changes centered in the epididymis with secondary abscess formation. The epididymal walls are thickened and friable, separating a pale yellow to tan pus-filled cavity from surrounding tissue. The abscess cavities appear irregular and are lined by inflammatory granulation tissue. The adjacent testicular parenchyma is largely unremarkable or only minimally involved. In this case, numerous foamy histiocytes populate the walls of the abscess, consistent with xanthogranulomatous epididymo-orchitis. The foamy macrophages are lipid-laden and may be accompanied by multinucleated giant cells, lymphocytes, and plasma cells; cholesterol clefts and necrotic debris may be present in the inflammatory loci. The overall pattern is chronic inflammation with focal granulomatous response. Clinically, this entity can simulate an infiltrating neoplasm and may present with scrotal swelling, pain, or mass. Pathologic significance lies in recognizing xanthogranulomatous inflammation as a distinct chronic infectious/inflammatory process rather than malignancy; microbiologic correlation is helpful; treatment typically involves antibiotic therapy and surgical drainage or epididymectomy, depending on extent. Differential diagnoses include tuberculous epididymo-orchitis, malakoplakia, chronic bacterial epididymitis, and less commonly granulomatous vasculitis. This specimen provides educational utility for gross-pathology and diagnostic pathology teaching, illustrating how histiocyte-rich, foamy macrophage inflammation can shape scrotal disease.

Comprehensive Description: This is a gross pathology photograph of a male scrotal specimen showing xanthogranulomatous epididymo-orchitis with abscess formation. The inflammatory process is predominantly centered in the epididymis with secondary involvement of adjacent testicular tissue. The abscess walls are thickened and lined by numerous foamy histiocytes, lipid-laden macrophages, and chronic inflammatory cells. On cut sections, the epididymal ducts and surrounding stroma display pale, granulomatous nodules intermixed with necrotic debris and sparse lymphocytes. The overall appearance is a granulomatous, macrophage-rich inflammatory reaction consistent with xanthogranulomatous inflammation, which can mimic neoplasm clinically. In this case, bilateral scrotal contents are involved, though the most conspicuous changes reside in the epididymal tissue; testicular parenchyma is relatively preserved. The image illustrates the histologically distinctive foamy macrophage infiltrate within the abscess walls and surrounding granulomatous response. Clinically, this entity represents a chronic infectious or inflammatory process that may require surgical drainage or excision and antibiotic therapy. Differential considerations include tuberculous epididymo-orchitis, malakoplakia, other granulomatous infections, and rarely epididymal/neoplastic processes. This image is educational for medical students, pathologists, urologists, and radiologists to recognize xanthogranulomatous epididymo-orchitis and its abscess morphology. The accompanying histology demonstrates macrophage-rich inflammatory tissue with lipid-laden cytoplasm and occasional multinucleated giant cells for educational reference.

This clinical photograph captures an intraoperative view of an open cardiac surgical site during a complex cardiothoracic procedure. The image depicts a sternotomy with the heart exposed and a surgical field maintained by a metal rib retractor. An inset in the upper-left corner provides a magnified view of the primary pathology: a significant aortic root abscess. This abscess is characterized by localized, yellowish-white purulent material and necrotic tissue extending from the aortic valve area toward the left main truncus. A red arrow indicates the specific involvement of the circumflex artery, which is encased in a sheath of pus. The surgical environment includes essential equipment such as cardiopulmonary bypass cannulae (red tubing carrying blood), an electrocautery device held by a surgeon, and various surgical clamps and forceps. The educational focus is on the visual manifestation of infective endocarditis complications, specifically the formation of perivalvular abscesses and the surgical anatomy of the aortic root.

This clinical photograph captures a surgical incision and drainage (I&D) procedure of a subcutaneous abscess. The image focuses on a small, transverse incision made in the right hypochondriac region of the abdomen. Thick, opaque, yellowish purulent material (pus) is visible emerging from the opening, indicating an active infectious process. Several hands clad in sterile white surgical gloves are positioned around the site; one set of hands applies pressure to the surrounding skin to facilitate drainage, while another hand holds a surgical instrument, likely a hemostat or forceps, to keep the incision edges open. The surgical field is prepared with green sterile drapes, and the surrounding skin appears erythematous and taut. This visual demonstrates the management of a liver abscess with parietal extension, illustrating key steps in bedside or operating room drainage of localized collections. It serves as an educational example for general surgery and infectious disease specialties, highlighting the physical characteristics of purulent exudate and basic surgical technique.

This diagnostic image is an axial computed tomography (CT) scan of the upper abdomen, specifically focused on the liver. The scan reveals a large, ill-defined, hypodense lesion within the right lobe of the liver, consistent with a hepatic abscess. Centered within this fluid collection is a highly radiopaque, pigtail-shaped structure, identifying a percutaneous drainage catheter (drain) placed for therapeutic intervention. The surrounding liver parenchyma appears otherwise unremarkable in density. Posteriorly, the vertebral body and neural arch are visible as hyperdense (bright white) bony structures. The rib cage is partially visualized at the periphery of the abdominal cavity. Subcutaneous fat is seen as a low-density (dark gray) layer beneath the skin. This image serves as a clinical example of radiographic monitoring for image-guided drainage of complex intra-abdominal infections, such as those caused by vancomycin-resistant Enterococcus (VRE) or other multidrug-resistant organisms.

A series of four axial CT images (A–D) demonstrating multi-organ complications in a clinical case. Image A (Brain CT): Shows extensive regions of low density across the right hemisphere and left posterior lobes, consistent with massive infarction. Intraparenchymal gas pockets (white arrow) and a significant midline shift to the left indicate pneumocephalus and cerebral herniation. Image B (Chest CT): Displays a large right-sided pneumothorax (white arrow) with underlying lung atelectasis and consolidation, accompanied by subcutaneous emphysema in the soft tissues of the chest wall. Image C (Abdominal CT): Reveals a large hepatic lesion with an air-fluid level and a visible drainage tube (white arrow), characteristic of a liver abscess under treatment. Image D (Abdominal CT): Shows the bilateral kidneys with internal areas of altered density and scattered gas (white arrows), suggesting emphysematous or hemorrhagic foci. This sequence illustrates a severe systemic infectious process, such as invasive Klebsiella pneumoniae syndrome, leading to metastatic infections and emphysematous changes in multiple organ systems.