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Pilomatricoma is a benign skin tumor derived from the hair matrix. [ 2 ] [ 3 ] These neoplasms are relatively uncommon and typically occur on the scalp, face, and upper extremities. Clinically, pilomatricomas present as a subcutaneous nodule or cyst with unremarkable overlying epidermis that can range in size from 0.5 to 3.0 cm, but the largest ...
The first case of spontaneous pneumothorax associated with BHD was discovered in 1986; [3] the first case of renal cancer followed in 1993, [6] and the presence of lung cysts in people with BHD was confirmed in 1999. [4] People with BHD were once thought to be at higher risk for colorectal polyps and neoplasms, but this has been disproven. [2]
Nevus sebaceus or sebaceous nevus (the first term is its Latin name, the second term is its name in English; also known as an "organoid nevus" [1]: 661 and "nevus sebaceus of Jadassohn" [2]: 773 ) is a congenital, hairless plaque that typically occurs on the face or scalp. [3]
Pilonidal means 'nest of hair' and is derived from the Latin words for 'hair' (pilus) and 'nest' (nidus). [5] The condition was first described by Herbert Mayo in 1833. [28] R. M. Hodges was the first to use the phrase pilonidal cyst to describe the condition in 1880. [29] [30] The condition was widespread in the United States Army during World ...
Hair-grooming syncope (also known as hair-combing syncope) is a form of syncope (a fainting disorder) associated with combing and brushing one's hair. It is most typically seen in children aged five to sixteen. Hair-grooming syncope typically manifests as presyncopal symptoms during hair combing, brushing, braiding, trimming, curling or blow ...
Relative incidence of cutaneous cysts: Trichilemmal cyst is labeled near top. A trichilemmal cyst (or pilar cyst) is a common cyst that forms from a hair follicle, most often on the scalp, and is smooth, mobile, and filled with keratin, a protein component found in hair, nails, skin, and horns.
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The mutation apparently causes hair follicle stem cells to differentiate into the cells which form cylindroma-, spiradenoma-, trichoepithelioma-, and/or spiradenocylindroma-like lesions. [8] Penetrance (i.e. the percentage of individuals with CCS that exhibit symptoms of the disease) has ranged from 44% to 100% (overall average, 72%) in ...