As such, they also have a tendency to calcify and are highly vascularized.Meningiomata often are considered benign tumors that can be removed by surgery, but most recurrent meningiomata correspond to histologic benign tumors. The metabolic phenotype of these benign recurrent meningiomata indicated an aggressive metabolism resembling that observed for atypical meningioma. Diagnosis
Meningiomata are visualized readily with contrast CT, MRI with gadolinium, and arteriography, all attributed to the fact that meningiomata are extra-axial and vascularized. CSF protein levels are usually found to be elevated when lumbar puncture is used to obtain spinal fluid. On T1-weighted contrast-enhanced MRI, they may show a typical dural tail sign absent in some rare forms of meningiomas.Although the majority of meningiomata are benign, they may have malignant presentations. Classification of meningiomata are based upon the WHO classification system. Benign (Grade I) – (90%) – meningothelial, fibrous, transitional, psammomatous, angioblastic
Atypical (Grade II) – (7%) – chordoid, clear cell, atypical (includes brain invasion)
Anaplastic/malignant (Grade III) – (2%) – papillary, rhabdoid, anaplastic (most aggressive)In a 2008 review of the latter two categories, atypical and anaplastic-meningioma cases, the mean overall survival for atypical meningiomata was found to be 11.9 years vs. 3.3 years for anaplastic meningiomata. Mean relapse-free survival for atypical meningiomata was 11.5 years vs. 2.7 years for anaplastic meningiomata.Malignant anaplastic meningioma is aggressive. Although anaplastic meningioma has higher chances of distant metastasis than the other two types, the overall incidence of meningioma metastasis is only 0.18%; which is considered rare.
Pili annulati (also known as "ringed hair") is a genetic trait in which the hair seems ‘banded‘ by alternating segments of light and dark color when seen in reflected light. : 767 : 640

See also
Pili pseudoannulati
List of cutaneous conditions

References
External links
Hair Transplant