Coal forms from the accumulation of plant debris, usually in a swamp environment. When plant debris dies and falls into the swamp the standing water of the swamp protects it from decay. Swamp waters are usually deficient in oxygen, which would react with the plant debris and cause it to decay.
Porokeratosis is generally considered to be a benign condition though malignant transformation has been seen in all but the punctate variety, necessitating regular followup of patients with porokeratosis (Maubec et al., 2005; Sasson & Krain, 1996).
In children with DiGeorge syndrome, the thymus gland may be small or missing, resulting in ... poor immune function as children, due to a small or missing thymus, may have ... Rarely, tumors of the lungs, thyroid, kidney, pancreas, or thymus gland produce hormones that ... Easy bruising. Excess hair growth or acne in women; Menstrual disorders, especially infrequent or ... treatment option); Surgical removal of part, all, or both adrenal glands; Radiation for ...