This is a histopathology image of endometrial tissue demonstrating papillary serous carcinoma, a high‑grade variant of endometrial cancer. The specimen shows endometrial glandular epithelium with papillary fronds and a conspicuous papillary architecture with fibrovascular cores, lined by markedly atypical serous carcinoma cells. Nuclear features include marked pleomorphism, enlarged nuclei, conspicuous nucleoli, increased mitotic activity, and frequent apoptotic bodies. A focal necrotic zone is present within the tumor epithelium, with eosinophilic debris and ghost outlines at the base. The lesion often recapitulates serous histology seen in ovarian or fallopian tube serous carcinomas and may coexists with background atrophic or proliferative endometrium. Psammoma bodies may be present. The image demonstrates high‑grade cytology, with p53‑altered phenotype on immunohistochemistry (not shown here), and aggressive behavior with early invasion into the myometrium. Clinical context links to prior pelvic radiation for cervical cancer, long‑term tamoxifen exposure, BRCA1 mutation, and breast carcinoma. Pathologic diagnosis correlates with history and confirms endometrial serous carcinoma with necrosis focus; prognosis is poorer than endometrioid types, requiring comprehensive surgical staging, adjuvant chemotherapy, radiotherapy, and molecular profiling for targeted therapy considerations. This histology image is educational for gynecologic oncology, pathology residents, and medical students. Useful for differential diagnosis and prognosis discussions.

This immunohistochemistry slide of breast tissue was prepared for E-cadherin staining and captured by brightfield microscopy at high magnification. The specimen shows a ductal compartment containing ducts with cohesive epithelial cells consistent with ductal carcinoma in situ (DCIS) that demonstrate strong membranous brown staining for E-cadherin. Adjacent lobular-type cellular nests show absent or markedly reduced E-cadherin staining, compatible with lobular carcinoma in situ (LCIS). Notably, one duct exhibits a hybrid region in which both DCIS and LCIS phenotypes are present within the same duct, illustrating intraductal heterogeneity. The DCIS component forms well-defined, angulated outlines; the LCIS component is less cohesive, with smaller, uniform cells and loose cell packing. The staining pattern confirms the differential adhesion molecule expression between ductal and lobular neoplasia. Clinically, E-cadherin immunostaining is critical for accurate classification of in situ lesions, guiding surveillance, surgical margins, and adjuvant therapy decisions. This image is valuable for educational comparisons of DCIS versus LCIS morphology and for research on combined in situ phenotypes, clonal relationships, and diagnostic workflows in breast pathology. It may aid differential diagnosis against invasive carcinoma and aid optimization of pathology reporting and multidisciplinary management. Clinical correlation with imaging findings and margin status should be integrated into reporting.

This is a histopathology micrograph of breast tissue stained with Hematoxylin and Eosin (H&E) at high magnification, illustrating apocrine-type ductal carcinoma in situ (DCIS) with extension into lobular structures. The image highlights solid and cribiform ductal proliferations composed of large polygonal cells with abundant eosinophilic, granular cytoplasm, prominent nuclei, and conspicuous nucleoli, consistent with apocrine differentiation. These neoplastic apocrine cells are arranged within ductular and lobulocentric spaces, and are embedded in fibrous stroma with focal sclerosing adenosis, raising potential mimics of invasive carcinoma if the myoepithelial boundary is disrupted. The apocrine DCIS demonstrates an in-situ pattern without overt stromal invasion. In practice, E-cadherin immunostaining may be used to differentiate this entity from lobular neoplasia: apocrine DCIS typically preserves membranous E-cadherin expression, whereas lobular carcinoma in situ shows absent or fragmented staining. Myoepithelial markers (p63, smooth muscle actin, calponin) can aid in confirming an in-situ process by highlighting an intact/basal myoepithelial layer surrounding ducts and lobules. This image underscores the diagnostic challenge when apocrine DCIS extends into sclerosing adenosis and may simulate invasive carcinoma; careful histomorphology combined with ancillary immunohistochemistry is essential for accurate classification and subsequent clinical management. Ancillary testing and multidisciplinary review guide appropriate surgical and adjuvant therapy decisions.

Histopathology slide of breast tissue; transverse cross-section through a breast duct; densely packed neoplastic ductal epithelial cells fill the lumen; cells exhibit high nuclear grade with marked pleomorphism, hyperchromasia, conspicuous nucleoli; the cytoplasm is relatively abundant and borders are sharply demarcated. The epithelial proliferation forms solid/cribriform arrangements; the surrounding basement membrane appears intact; there is no obvious stromal invasion. Central luminal material may show eosinophilic debris consistent with necrosis in some ducts. The tissue architecture is characteristic of ductal carcinoma in situ, high-grade subtype. Diagnostic significance: Non-invasive precursor lesion with potential progression to invasive cancer; high-grade DCIS carries higher risk and often requires surgical excision with clear margins and consideration of radiotherapy; may be associated with microcalcifications on imaging. Differential considerations: low-grade DCIS, cribriform or comedo patterns, invasive ductal carcinoma without invasion; lobular neoplasia unlikely due to ductal architecture; clinical correlation with mammography and breast imaging is essential. Clinical use cases: pathology teaching slides, diagnostic review, AI training for histopathology DCIS recognition, radiologic-pathologic correlation, surveillance planning. Expressed terms include intraductal, ductal carcinoma in situ, high-grade, solid, cribriform, pleomorphic; emphasizes need for margin assessment and multidisciplinary review.

Brightfield histopathology image of breast tissue stained with hematoxylin and eosin (H&E). The specimen shows lobular units filled by small, uniform cells with round to oval nuclei, inconspicuous nucleoli, and scant cytoplasm. Cells are discohesive and expand the terminal duct-lobular units without forming ductal structures, a characteristic pattern of lobular carcinoma in situ (LCIS). In this case, classic LCIS is observed without cytologic atypia, pleomorphism, increased mitotic activity, or necrosis; features that would otherwise designate pleomorphic LCIS when present alone or in combination. The architecture remains confined to lobules with preservation of basement membrane and no evidence of stromal invasion. Background breast parenchyma shows mild fibrous stroma and occasional benign ductal hyperplasia. The image emphasizes in-situ proliferation of mammary epithelial cells that express loss of cohesion and a monomorphic cytologic appearance. Clinically, classic LCIS indicates a marker of increased risk for concurrent or subsequent breast carcinoma in either breast and may influence surgical and surveillance management. Diagnostic significance lies in distinguishing classic LCIS from pleomorphic LCIS and from other in-situ or invasive lesions such as ductal carcinoma in situ (DCIS). This histologic pattern underscores the importance of careful histopathologic assessment and correlates with imaging and clinical risk assessment.