This medical pathophysiology diagram illustrates the complex cytokine signaling network and cellular interactions involved in Benign Prostatic Hyperplasia (BPH). It highlights the interplay between prostate epithelial cells (BPH-1, PWR-1E), stromal cells (WPMY-1), and infiltrating M2 macrophages. Key signaling pathways depicted include the IL-8 axis (involving receptors CXCR1/2 and CXCR7), which promotes BPH-1 growth and is inhibited by Ursolic and Oleanolic acids. The diagram shows M2 macrophages secreting TGF-β2 and IGF-1 to drive epithelial-mesenchymal transition (EMT), hyperplasia, and cell division. Pro-inflammatory signaling through IL-1 activates the JAK-STAT pathway to stimulate IGF-1, while recombinant MIF (rMIF) promotes growth by modulating P53 and COX-2 levels. Additionally, the role of metabolic factors like insulin and plasma cytokines (IL-17, ANGPT2) in stimulating BPH-1 and WPMY-1 cell proliferation is shown. Therapeutic interventions are represented by Celecoxib, which blocks macrophage-induced proliferation via CCL3 reversal. This schematic serves as an educational tool for understanding the immunoinflammatory and endocrine mechanisms driving prostate enlargement.

Light microscopy image of prostatic tissue stained with Hematoxylin and Eosin (H&E). The slide displays a well-circumscribed nodule composed of loose, fibromuscular stroma with sparse cellularity, representing an early stromal component of benign prostatic hyperplasia (BPH). Epithelial elements are scant within the nodule, with little glandular proliferation, and the surrounding prostate parenchyma shows a conventional fibromuscular stroma adjacent to residual glands. The stromal cells are spindle-shaped with elongated nuclei and pale cytoplasm embedded in a myxoid to fibrous extracellular matrix; mitotic activity is absent or minimal. There is no cytologic atypia, necrosis, or significant inflammatory infiltrate. This pure stromal nodularity represents one of the earliest histologic changes in BPH and can be encountered incidentally on prostate needle biopsies. Importantly, the diagnosis of prostatic hyperplasia (or nodular hyperplasia) should not be rendered on needle core biopsy; rather, specimens should be signed out as benign prostatic tissue with descriptive comment on the nodular stroma. Clinically, such findings may correlate with lower urinary tract symptoms in the patient, but histology alone cannot confirm severity. The differential considerations include stromal-rich lesions or scar tissue; malignant prostatic neoplasia is not suggested by these features. This pattern emphasizes strict sign-out criteria.

High magnification hematoxylin and eosin stained sections from a transurethral resection specimen show benign prostatic tissue with atypical adenomatous hyperplasia (adenosis). Glandular units vary in size and display round, oval, or irregular lumina. The epithelial cytoplasm is pale, contrasting with the amphophilic cytoplasm commonly seen in prostatic adenocarcinoma. Nuclei are not markedly enlarged and prominent nucleoli are generally absent; however, in up to about 30% of cases nucleoli may be conspicuous. The architecture consists of densely packed acini forming small, tight clusters without destructive invasion or stromal desmoplasia. Basal cell layering, when preserved, supports a benign process, and cytologic atypia is mild relative to carcinoma. The lesion overlaps with features that can mimic cancer, so careful assessment of invasion, nucleolar prominence, mitotic activity, and glandular polarity is essential. This image highlights a benign proliferative process, benign mimics of neoplasia, and the importance of correlating histology with clinical data. Clinically, distinguishing adenosis from prostatic adenocarcinoma influences management, PSA interpretation, and surveillance strategy. The findings are relevant for surgical pathology education, differential diagnosis discussions, and educational case repositories aiming to illustrate pitfalls in prostate lesion interpretation, particularly in TURP specimens. Educational value. Educational context for pathology residents and practicing clinicians worldwide today.