- 1.Trichilemmal cyst - Wikipedia, the free encyclopedia
- ... cyst. From Wikipedia, the free encyclopedia (Redirected from Pilar ... Pilar cysts may ... pilar cyst wall is the thickest and most durable of the many ...
- http://en.wikipedia.org/wiki/P
ilar_cyst
- 2.Pilar Cyst: eMedicine Dermatology
- Pilar cysts are the second most frequent type of ... In 2% of pilar cysts, single or multiple foci of proliferating cells lead to ...
- http://emedicine.medscape.com/
article/1058907-overview
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Can pilar cysts have any I have a pilar cyst on the
back of my head, on the lower
right side. It seems to be
pretty sizeable, maybe about
.5" (possibly less?) in width.
Now my question is, can this
have any symptoms or negative
effects, as far as motor
control/brain function/etc?
I've always had headaches and
they seem to come from the
back of my head. It also
really feels like the cyst is
pushing against sometime and
puts pressure on it. Not sure
if that's just me feeling it,
but is that possible?
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Here's a website that will give you the information you need. http://www.patient.co.uk/showd oc/23068818/ |
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pilar cysts?
I was wondering if anyone has
every had pilar cysts. I get
them on my scalp, that aren't
noticable because i have
longer thick hair but they're
annoying and they can be
tender and hurt. I got a few
of them removed but they still
grow. They're just tiny bumps
and i obviously can't get all
of them removed all the time
that's a lot of time and money
and surgery! Does anyone have
them and put up with theM?
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There is more at the link. Pilar cysts are common, occurring in 5-10% of population. They are the second most common keratinizing cyst on the scalp. Their benign and malignant transformation is extremely rare. Inheritance may occur in an autosomal dominant pattern. Pilar or trichilemmal cysts contain keratin and its breakdown products, lined by a wall resembling the external (outer) hair root sheath. Most pilar cysts occur on the scalp. In 2% of pilar cysts, single or multiple foci of proliferating cells that can lead to rare cases of proliferating pilar tumors, more commonly called proliferating trichilemmal cysts, have been observed. They were originally considered malignant; however, Wilson Jones suggested that they are pseudocarcinomatous. Proliferating trichilemmal cysts are rapidly growing tumors that often occur in trichilemmal cysts, but they can occur de novo without a preexisting lesion. The tumors may become large and ulcerated. Although considered biologically benign, the cysts may be locally aggressive. In rare cases, malignant transformation has occurred as demonstrated by distant metastasis. No reliable clinical criteria exist to distinguish a malignant tumor from a benign proliferating pilar tumor. The entire lesion must be histologically evaluated to assess the possibility of malignancy. Pathophysiology: Trichilemmal cysts are derived from the outer root sheath of the hair follicle. Their origin is unknown, but it has been suggested that they are produced by budding from the external root sheath as a genetically determined structural aberration. They arise preferentially in areas of dense hair follicle concentrations; therefore, 90% of cases occur on the scalp. They are solitary in 30% of cases and multiple in 70% of cases. Histologically, areas with signs of proliferation can be found in some cysts. In rare cases, this leads to formation of a tumor, known as a proliferating trichilemmal cyst. The tumor is clinically benign, although it may display nuclear atypia, dyskeratotic cells, and mitotic figures. These features can be misleading, and a diagnosis of squamous cell carcinoma may be mistakenly rendered. Frequency: In the US: Pilar cysts are common, occurring in 5-10% of the population. Of patients with these cysts, 70% have several lesions and 10% have more than 10 lesions. Mortality/Morbidity: Pilar cysts are considered biologically benign, but they may be locally aggressive. Malignant transformation has occurred in rare cases, as demonstrated by distant metastasis. |
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