There is no clinical diagnosis for<unk>  as cases are rarely seen and are often comorbid with other conditions. Classifications<unk>  is classified according to the presence, or lack of underlying cause. Studies suggest that<unk>  often occurs in individuals in a secondary form to other ailments. However, the condition can also be present on its own.<unk>  can be classified into two forms: ‘primary’ (essential and non-essential) and ‘secondary’. The classifications are: :*Primary essential :*Primary non-essential :*Secondary Primary essential<unk>  is where the cause of the condition in unknown. It has no other associated abnormalities. This occurs mainly in men, with a male:female ratio of 5:1 or 6:1, and develops during or soon after puberty. Because of the slow progression of the condition, which usually occurs without symptom, it often passes unnoticed in the early stage. Primary non-essential<unk>  can be associated with neuropsychiatric disorders including cerebral palsy, epilepsy, seizures, and ophthalmologic abnormalities, most commonly cataracts. Secondary<unk>  occurs as a consequence of a number of diseases or drugs that produce changes in scalp structure. These include: acromegaly (excessive growth hormone levels due to pituitary gland tumours), and theoretically, the use of growth hormone itself or the use of drugs that mimic the effect of growth hormone (such as GHRP-6 and CJC-1295). It may also arise in association with melanocytic naevi (moles), birthmarks (including connective tissue naevi, fibromas and naevus lipomatosus), and inflammatory processes (e.g. eczema, psoriasis, Darier disease, folliculitis, impetigo, atopic dermatitis, acne).
Cutis verticis gyrata
Caput medusae
Caput Medusae
Commotio cordis
Tapetum lucidum
Fovea centralis
Glia limitans
Corpora quadrigemina