Medulloblastomas: Medulloblastomas (PNETs) are the most common malignant brain tumor in children (20% of all pediatric tumors) and usually occur in children between the ages of 4 and 10 years. Medulloblastomas occur more often in boys than in girls.
Acanthocyte (from the Greek word á¼ÎºÎ±Î½Î¸Î± acantha, meaning 'thorn'), in human biology and medicine, refers to a form of red blood cell that has a spiked cell membrane, due to abnormal thorny projections. A similar term is spur cells.canthocytosis can be seen in: Acute or Chronic Anemia, Hepatitis A,B,C; Hepatorenal syndrome, Hypopitutarism, Malabsorption Syndromes, Malnutrition In malnourishment, such as anorexia nervosa and cystic fibrosis, acanthocytosis remits with resolution of the nutritional deficiency.
Melanocyte, specialized skin cell that produces the protective skin-darkening pigment melanin. Birds and mammals possess these pigment cells, which are found mainly in the epidermis, though they occur elsewhereâe.g., in the matrix of the hair. Melanocytes are branched, or dendritic, and their dendrites are used to transfer pigment granules to adjacent epidermal cells.