The gross specimen of a bisected uterus shown above reveals a markedly thickened, irregular, and friable endometrial lining with areas of hemorrhage. The most likely diagnosis is:

Explanation

## Image Findings * **Gross specimen of a bisected uterus** with attached adnexa (fallopian tube and ovary). * The **endometrial lining is markedly thickened**, appearing several times its normal thickness. * The endometrial surface is **irregular, nodular, and somewhat polypoid**, filling much of the uterine cavity. * The tissue appears **friable and congested**, with areas of reddish discoloration suggestive of hemorrhage. * The overall uterine size appears enlarged, and the endometrial growth measures several centimeters. ## Diagnosis **Key Point:** The gross appearance of a markedly thickened, irregular, and friable endometrial lining is highly characteristic of **endometrial hyperplasia**. Endometrial hyperplasia is a spectrum of proliferative disorders of the endometrial glands and stroma, resulting from prolonged unopposed estrogen stimulation. The image demonstrates a significant degree of endometrial proliferation, likely **complex or atypical hyperplasia**, given the marked thickening, irregularity, and friable nature of the tissue. These gross features distinguish it from normal endometrium and suggest a pathological process. ## Differential Diagnosis | Feature | Endometrial Hyperplasia (Atypical/Complex) | Endometrial Adenocarcinoma | Submucosal Leiomyoma | Endometrial Polyp | | :------------------ | :----------------------------------------- | :------------------------------------------------------- | :------------------------------------------------------- | :------------------------------------------------------- | | **Gross Appearance** | Markedly thickened, irregular, friable, often polypoid/nodular endometrium, diffuse. | Infiltrative mass, often with necrosis, ulceration, deep myometrial invasion. Can be exophytic. | Discrete, firm, whorled, well-circumscribed mass, often intramural or protruding into cavity. | Localized, often pedunculated or sessile growth, usually smooth or lobulated. | | **Location** | Diffuse involvement of endometrial lining. | Originates from endometrium, often infiltrates myometrium. | Originates from myometrium. | Focal growth from endometrium. | | **Texture** | Friable, soft. | Friable, often necrotic. | Firm, rubbery. | Soft to firm, depending on stromal content. | | **Hemorrhage** | Common, especially with atypia. | Common, often with necrosis. | Less common, unless degenerating. | Can occur, especially with larger polyps. | ## Clinical Relevance **Clinical Pearl:** Endometrial hyperplasia, particularly atypical hyperplasia, is a **precursor lesion to endometrial adenocarcinoma**. Patients typically present with **abnormal uterine bleeding**, especially postmenopausal bleeding or heavy menstrual bleeding in premenopausal women. ## High-Yield for NEET PG **High-Yield:** The most important risk factor for endometrial hyperplasia and carcinoma is **unopposed estrogen stimulation**. This can be endogenous (e.g., obesity, anovulation, estrogen-producing tumors) or exogenous (e.g., estrogen-only hormone replacement therapy). **Key Point:** Endometrial hyperplasia is classified based on architectural complexity (simple vs. complex) and presence of cytological atypia (with vs. without atypia). **Atypical complex hyperplasia** carries the highest risk of progression to adenocarcinoma. ## Common Traps **Warning:** On gross examination alone, it can be challenging to definitively distinguish severe atypical endometrial hyperplasia from early well-differentiated endometrial adenocarcinoma. Microscopic examination is essential for definitive diagnosis and grading. ## Reference [cite:Robbins Basic Pathology, 10th Ed, Ch 22; Harrison's Principles of Internal Medicine, 20th Ed, Ch 119]