## Psammoma Bodies — Serous vs. Mucinous Tumors **Key Point:** Psammoma bodies are a **characteristic feature of serous tumors**, NOT mucinous tumors. They are significantly more common in serous cystadenomas and serous cystadenocarcinomas than in mucinous neoplasms. ### Comparison of Serous and Mucinous Ovarian Tumors | Feature | Serous | Mucinous | |---------|--------|----------| | **Epithelial lining** | Cuboidal to columnar, resembles fallopian tube | Tall columnar, resembles intestinal mucosa | | **Mucin content** | Absent or minimal | Abundant, mucin-secreting | | **Psammoma bodies** | **Present in ~10% of cases** | **Rare or absent** | | **Age of presentation** | 20–40 yrs (benign); 50–60 yrs (malignant) | 30–50 yrs | | **Frequency** | 40% of epithelial ovarian tumors | 10–15% of epithelial ovarian tumors | | **Malignant potential** | Moderate to high | Lower than serous | | **Bilateral involvement** | Common in malignant forms | Rare | **High-Yield:** **Psammoma bodies are a serous tumor feature**, not mucinous. This is a high-yield distinction for NEET PG: - **Serous tumors** → psammoma bodies (calcified laminated structures) - **Mucinous tumors** → abundant mucin, NO psammoma bodies **Mnemonic:** **SEROUS = Serous, Epithelial, Resembles fallopian tube, Ovary, Uses psammoma, Serous** — helps anchor that psammoma bodies belong to serous tumors. ### Correct Features of Mucinous Tumors 1. **Tall columnar epithelium resembling intestinal mucosa** — This is the hallmark of mucinous differentiation and distinguishes mucinous from serous tumors. 2. **Marked atypia and stromal invasion in cystadenocarcinoma** — Malignant mucinous tumors show increased nuclear enlargement, hyperchromasia, mitotic activity, and invasion. 3. **Frequency of 10–15% of epithelial ovarian tumors** — Mucinous tumors are less common than serous tumors (which account for ~40%).
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