First line
At first, treatment is usually with topical permethrin 1% cream, which can be bought over the counter without a prescription. It is applied to the areas affected by pubic lice and washed off after 10 minutes. Brands of permethrin include Lyclear, available in the UK as a creme rinse or dermal cream at 5% strengths. In the US, permethrin may be familiar as NIX, Actin and ElimiteAn alternative is the combination of pyrethrins and piperonyl butoxide, in a topical application, which include the brands Licide, and A-200, Pronto and RID shampoos. These medications are safe and effective when used exactly according to the instructions in the package or on the label. To kill newly hatched lice, both treatments can be repeated within the following seven to ten days.European guidelines state alternatives to permethrin as including either the application of 0.2% phenothrin (washed off after two hours), or 0.5% malathion lotions (washed off after 12 hours). The CDC states alternatives as topical 0.5% malathion or oral ivermectin. Other treatments
Lindane is still used in a shampoo form in some non-European countries. Its licence was withdrawn by the European Medicines Agency in 2008. It may be considered as a last resort in some people who show resistance to other treatments, but is not recommended to be used for a second round of treatment. Lindane is not recommended in pregnant and breastfeeding women, children under the age of two years, and people who have extensive dermatitis.
A hemangiopericytoma is a type of soft-tissue sarcoma that originates in the pericytes in the walls of capillaries. When inside the nervous system, although not strictly a meningioma tumor, it is a meningeal tumor with a special aggressive behavior. It was first characterized in 1942. Histopathology
Hemangiopericytomas are tumors that are derived from specialized spindle shaped cells called pericytes, which line capillaries. Diagnosis
Hemangiopericytoma located in the cerebral cavity is an aggressive tumor of the mesenchyme with oval nuclei with scant cytoplasm. "There is dense intercellular reticulin staining. Tumor cells can be fibroblastic, myxoid, or pericytic. These tumors, in contrast to meningiomas, do not stain with epithelial membrane antigen. They have a grade 2 or 3 biological behavior, and need to be distinguished from benign meningiomas because of their high rate of recurrence (68.2%) and metastases (Maier et al. 1992; Kleihues et al. 1993 )." Treatment
Depending on the grade of the sarcoma, it is treated with surgery, chemotherapy, and/or radiotherapy. Epidemiology
In one series, the median age of affected individuals was 45 years, with a 10-year survival rate of 70 percent. See also
Infantile hemangiopericytoma
List of cutaneous conditions

References
Further reading


== External links ==