This diagnostic image is an intraoperative hysteroscopic photograph of the uterine cavity. The visual focus is a well-defined, oval-shaped pedunculated endometrial polyp protruding from the posterior uterine wall. The polyp demonstrates a smooth, glistening surface with a pale pink to white color, interspersed with focal areas of erythema and fine vertical striations across its body. Its morphology is slightly lobulated, and it is attached to the uterine wall by a distinct stalk. The surrounding endometrial tissue appears healthy, smooth, and pink, although there is a slight darkening near the base of the pedicle, likely representing minor blood accumulation. This clinical photograph illustrates a common structural cause of abnormal uterine bleeding (AUB), frequently categorized under the 'Polyp' component of the FIGO PALM-COEIN classification system. Such findings are critical in the diagnostic workup of perimenopausal and postmenopausal women to differentiate benign focal abnormalities from endometrial hyperplasia or malignancy.

A complex pathophysiology diagram illustrating various cellular signaling pathways in the human endometrium, specifically highlighting mechanisms dysregulated in uterine fibroids. The flow begins with extracellular ligands binding to transmembrane receptors and concludes with functional physiological outcomes. Key pathways include: (1) TGF-β/SMAD signaling leading to endometrial remodeling and coagulation; (2) PGF2α/FP and ET-1/ETAR/ETBR signaling involving PLC, IP3, Calmodulin, and PKC cascades, which result in spiral artery vasoconstriction and myometrial constriction; (3) ETBR/VEGFR/PDGFR cross-talk through PI3K/AKT/mTOR and RAS/RAF/MEK/ERK pathways, driving vasodilation (via NO), proliferation, and angiogenesis; and (4) TNFα/TNFR signaling through Caspase cascades (apoptosis) and JNK/AP-1 pathways. Icons with upward arrows next to ligands like TGF-β, PGF2α, and VEGF indicate molecular upregulation typically seen in the presence of uterine fibroids. This educational diagram is targeted at an advanced level, illustrating how ligand-receptor interactions contribute to heavy menstrual bleeding and abnormal uterine vascular architecture.

An educational comparison diagram illustrating the differences between normal and abnormal endometrium (specifically endometriosis). The top section displays two anatomical illustrations of a mammal uterus. The 'Normal endometrium' shows a smooth, uniform uterine cavity with an open, Y-shaped internal structure. The 'Abnormal endometrium diagram' depicts a constricted, triangular uterine cavity with thickened, irregular linings and growths, suggestive of ectopic tissue implantation. The bottom section presents five high-magnification grayscale diagnostic images representing cellular pathology. The normal side shows 'Early secretory cells' and 'Early basement membrane' with visible, organized textures and clear cellular arrangements. In contrast, the abnormal side shows 'Abnormal early secretory cells,' 'Abnormal early epithelial cells,' and 'Abnormal early basement membrane,' which exhibit significantly darker, less defined clusters and disrupted structural integrity. This diagram serves as a visual guide to the gross anatomical and microscopic cellular changes associated with endometrial pathology.