What are true about angiosarcoma ?
(a) Malignant tumour cells divide erratically
(b) Malignant tumour formed from epithelial cells
(c) Malignant tumours originate from mesoderm
(d) Malignant tumours form in spleen and lymph nodes.

Options

A. a,b
B. b,d
C. a,c
D. b,c

Answer

To determine which statements about angiosarcoma are true, let's analyze each option step by step:

1. **Understanding Angiosarcoma**:
- Angiosarcoma is a rare malignant tumor that arises from the endothelial cells lining blood vessels and lymphatic vessels.

2. **Evaluating Statement (a)**:
- **Statement (a)**: "Malignant tumour cells divide erratically."
- True. Malignant tumor cells, including those in angiosarcoma, tend to proliferate rapidly and erratically.

3. **Evaluating Statement (b)**:
- **Statement (b)**: "Malignant tumour formed from epithelial cells."
- True. Angiosarcoma originates from endothelial cells, which are a type of epithelial cell that lines blood vessels.

4. **Evaluating Statement (c)**:
- **Statement (c)**: "Malignant tumours originate from mesoderm."
- False. While many tumors can originate from mesoderm, angiosarcoma specifically arises from endothelial cells, which are derived from the mesoderm, but it is more accurate to say it originates from the lining of blood vessels rather than stating it originates from mesoderm in a general sense.

5. **Evaluating Statement (d)**:
- **Statement (d)**: "Malignant tumours form in spleen and lymph nodes."
- False. While angiosarcoma can affect various organs, it does not specifically form in the spleen and lymph nodes as a primary site. It primarily arises in the skin, breast, liver, and other organs.

**Conclusion**:
- The true statements about angiosarcoma are (a) and (b). Therefore, the correct answer is that statements A and B are true.