Monthly Archives: May 2010

Rosacea

Rosacea

Rosacea is a common facial eruption, which is characterized by redness, blushing, flushing and abnormal blood vessel growths called telangiectasia’s. Acne Rosacea is a disorder of skin pigmentation which presents during the ages of middle age, around 30-50. Acne rosacea is found more commonly in females, however, the involved and extent of disease is much more severe in males. This may be do to the more common finding of rhinophyma in males, while females mainly have the erythromatotelangiectatic form, which consists of flushing and persistent facial redness (please see below).

ACNE ROSACEA: Signs and Symptoms

Facial flushing, the presence of telangiectatic vessels, persistent redness of the face, inflammatory papules and pustules, hypertrophy of the sebaceous glands of the nose. Fibrosis of the sebaceous glands may also occur, which is referred to as rhinophyma. Ocular changes may also be present, and include dryness and irritation of the eyes, with blepharitis and conjunctivitis to rare, but life-threatening keratitis. The disease is chronic and progressive. Some patients clear in their later years, such as in their 60′s.

Acne Rosacea Skin

The skin of paitents with acne rosacea can have numerous different components. These include vascular, acneiform, ocular and phymatous changes.

Vascular

These include intermittent, with progression to persistent erythema (redness) and facial flushing. Telangiectasias may also be present which are small dilated blood vessels that have become prominently visible.

Acneiform

Similar to common acne, acne rosacea may also have lesions found in acne which point to an inflammation component of the diseases. These include papules, pustules and nodules. There are never comedones present. If comedones are present, the patient may have associated acne or the skin changes may be due to common acne and not acne rosacea if other rosacea skin changes are not found.

Ocular Involvement

In acne rosacea, the skin around the eye, as well as the eye may be involved. These include conjunctivitis and keratitis (inflammation) of the eye, and blepharitis, inflammation of the skin and tissue around the eye.

Phymatous Changes

Phymatous changes include rhinoyphyma (involvement of the nose), which are uncommon, but severe, late stage complication of progressive enlargement of nose disfiguration and enlargement resulting from sebaceous hyperplasia and skin damage through chronic inflammation. Involvement of other portions of the face can also occur, and the disease is not limited to the nose.

Onset of Acne Rosacea

Occurs between the ages of 30 and 50, and is more common in women by about 3 times. However, the distorting phymatous skin changes are more common in men. Overall, men also have more severe disease.

Exacerbating and triggers of flushing factors

These include sunlight, hot weather, alcohol, spicy foods, exercise, hot beverages such as tea, hot baths, cold weather, stress, menstruation, certain foods such as soya and medications.

Acne rosacea is associated with :

With migraine headaches in women, seborrheic dermatitis, and with Helicobacter pylori infection. Family history is also evident in about 1/3 of all patients.
The severity of the acne rosacea is graded as 1 (mild), 2 (moderate), and 3 (severe).

Acne Rosacea is subdivided into four subtypes:

Erythematotelangiectatic Acne Rosacea

This type of acne rosacea has intermittent and then persistent erythema (redness) of the central face, accompanied with flushing, telangiectasia, irritated skin, burning of the face, and often rhinophyma. Treated mainly with surgical or laser therapy to ablate prominent dilated vessels in severe types. There is often an acneiform component such as the presence of papules, pustules and nodules, but never comedones. If comedones are present, think acne, not acne rosacea. Mild types of erythematotelangiectatic acne rosacea are usually treated with topical ointments and creams, such as Metronidazole antibacterial creams.

Papulopustular Acne Rosacea

This type of acne has persistent erythema of the central face, but with prominent acne features without comedones, such as papules and pustules.

Phymatous Acne Rosacea

Phymatous, also commonly known as rhinophyma when involving the nose, is an uncommon late stage complication of progressive enlargement of the skin and tissue, mainly of the nose. The enlargement of the skin and tissue is believe to be due to sebaceous gland hyperplasia (overgrowth) and chronic abnormal inflammation.

Ocular Acne Rosacea

Ocular changes such as blepharitis (inflammation of skin around the eye), conjunctivitis (inflammation of white of the eye) and keratitis (inflammation of the keratin, coloured, layer of the eye). Usually presents with redness and itchiness in the eye.

Steroid-induced Rosacea

Acne rosacea, that presents similar to the erythematotelangiectatic form, secondary to steroid use, mainly prolonged topical steroid use on the face. Stoppage of steroids is the mainstay of treatment.

Acne Rosacea Course and Prognosis

Acne rosacea unfortunately is a chronic and slowly progressive skin disorder which rarely clears. Treatments help slow this progression, and commonly stop it. Many senior have also been reported to clear their acne rosacea in their 70′s.

Acne Rosacea can be mistaken for:

Seborrheic Dermatitis is known to coexist with acne rosacea.
Systemic Lupus Erythematosus
Acne Vulgaris
Basal Cell Carcinoma

Acne Rosacea Treatments and Medicines

Rosacea is very difficult to treat because it is caused by vasodilated vessels largely unresponsive to treatment. Corticosteroids are effective in reversing this vasodilation, but are contraindicated due to numerous adverse effects (e.g. atrophy of skin, such as thinning).
The main treatment is avoidance of substances and circumstances that cause vasodilation of these vessels. The mainstay of treatment is to begin with topical therapy, which includes metronidazole.

Topical Treatments and Medicines

Topical medications are not as good for vascular aspects of the disease, but moreso for prevention of disease progression. Treatment is long-term.

Metronidazole for Rosacea

Metronidazole is an antibiotic that has anti-inflammatory properties, and thereby decreasing the inflammation (redness) in the area fairly effectively, and mildly removes the redness due to vasodilated vessels. Metronidazole decreases papules and pustules, skin changes, around 70% over a 3 month period.
It is given as:
Metronidazole 0.75% Metrogel or Metrocream and 1% cream Noritate or Rosasol.
Metronidazole acts as an anti-inflammatory, thereby decreasing the formation of papules and pustules. This is believed to occur at a total decrease of 70% over a 2 months of consistent use.

Benzoyl Peroxide

Mainly used in common acne. Removes a small layer of skin and thereby removes the stimulus of inflammation. For mild acne rosacea.

Azelaic acid

20 % cream, applied twice daily is also effective

Sulfur

Precipitated sulfur at 1-3% concentration can be added to creams or 1% hydrocortisone preparations. This may potentiate steroid-induced acne rosacea however.

Cosmetic Cover-up

Rosacure and Diroseal, agents that are used to cover and mask the redness associated with acne rosacea.

Systemic Antibiotics

The use of systemic antibiotics is not well supported in acne rosacea, in contrast to common acne.

Tetracycline

Overall, poorly effective for erythematotelangiectatic rosacea and accompanied redness, but effective for clearing acne papules and pustules, as well as ocular rosacea. Given as 250 mg to 1000 mg daily based on severity of disease. Minocin may also be used at 100 mg.

Erythromycin

Similar to tetracycline, taken as 250 mg to 1000 mg a daily.

Clonidine

Clonidine, also known as Dixarit, may help relieve flushing. Started at 0.05 mg twice a day dose initially.

Accutane

Isotretinoin

Its effectiveness in acne rosacea is not well-documented, but seems less than with common acne. Overall, a very good medications to decrease acne lesions and redness, as well as some rhinophyma. The dosage used in acne rosacea is much less than that used to treat common acne.

Telangiectasia Treatments

Laser or Electrodesiccation.

Surgery

Surgical shave reduction, dermabrasion and electrosurgery for rhinophyma. CO2 laser can also be used.

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Acne

Acne

Acne is a very common inflammatory disease that affects the pilosebaceous system of the skin. Acne is a common skin condition that occurs due to changes in the action and levels of hormones, bacterial penetrance, inflammatory skin reactions and alterations in the skin’s oil glands, termed sebaceous glands and hair follicles. The developing skin in teenagers and the associated glands are easily effected to external insults and influences from the environment, such as sun exposure, fatty oils and sweat, water and detergents. These external skin insults lead to plugging of pores and outbreaks of lesions commonly called pimples or zits mainly on the face and back. Acne is not a serious threat to ones health, however, its emotional effects are always significant and cannot be overestimated. Moreover, permanent scarring and damage to ones skin can lead to lifelong skin and emotional problems.

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Mucocele Appendix

Mucocele Appendix

- a mucocele is basically a viscus filled with mucin

- important thing about appendiceal mucoceles is not to confuse them with mucinous cystadenomas of the appendix, which can look deceptively benign

- any adenomatous change in the epithelial lining then you do not have a mucocele but a mucious cystadenoma

- if mucinous cystadenoma pushes beyond the muscularis mucosa, without any obvious invasion or desmoplastic reaction, this is a mucinous cystadenocarcinoma of the appendix

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Barrett’s esophagus

Barrett’s esophagus

Barrett’s esophagus definition

- intestinal metaplasia of the lower portion of the esophagus

Barrett’s esophagus stain

- Alcian Blue PAS

Barrett’s esophagus complications

- cancer, complications of GERD gastroesophageal reflux disorder, erosive esophagitis and strictures

Barrett’s esophagus predisposing factors

- GERD with ulcerative changes, possible genetic predisposition

Microscopic characteristics of Barrett’s esophagus

- columnar epithelium forming glands with interspersed goblet cells

Barrett’s esophagus gross features

- lower esophagus, flat and salmon-pink mucosa

Barrett’s esophagus dysplasia

- grading is based on architectural and cytologic features:

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Helicobacter pylori

Helicobacter pylori

Helicobacter pylori clinical significance

-  Helicobacter pylori causes gastric ulcers, gastritis ( antral and pangastritis ) and is associated with development of gastric carcinoma (intestinal type) and lymphoma (MALT)

Helicobacter pylori diagnostic tests

- clinical: serologic (IgG  antibody), fecal bacterial detection, urea breath test (detects that ammonia produced by the Helicobacter pylori urease enzyme in exhaled breath)

Helicobacter pylori pathology

- H and E stain (can see Helicobacter pylori organisms sometimes), Modified Giemsa stain, Diff Quick, Warthin Starry, Genta stain, PCR, immunohistochemistry, culture, urease test (biopsy tissue is placed in a urea medium where a color change indicates presence of Helicobacter pylori and their urease enzyme which converts urea to ammonia causing the pH of the solution to rise)

Helicobacter pylori enzyme involoved in break down of urea?

- urease  – produces ammonia from urea : (NH2)2CO + H2O †’ CO2 + 2NH3

Light microscopic features of Helicobacter pylori

- S-shaped rods with multiple flagella on one end

Helicobacter pylori Treatments

- Helicobacter pylori is treated with antibiotics because it can cause a non healing ulcer, perforated ulcer, ulcer hemorrhage,  strictures and cancer.

Helicobacter pylori Cancers

- stomach cancer (gastric adenocarcinoma of the intestinal type, lymphoma of the MALT type)

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Gastrointestinal Stromal Tumors

GIST

Gastrointestinal stromal tumors

Gastrointestinal Stromal Tumors Classification

- low, intermediate and high risk of aggressive behavior

Gastrointestinal Stromal Tumors Morphology

-  spindled and epithelioid types

Gastrointestinal Stromal Tumors Immunohistochemistry

- CD117+ in 90%, CD34 + in 70%, SMA can  be focally positive, desmin – (desmin is positive in leiomoyomas)

Gastrointestinal Stromal Tumors Histogenesis

- can arise anywhere in the GI tract; 60-70% from stomach, 20-30% from the small intestine and <10% from elsewhere

- cells are from a proliferation of the interstitial cells of Cajal

- association with c-kit and PDGFA genes -  these are receptors with tyrosine kinase intracellular domains, and mutations in these cause their constitutive activation with activation of downstream signaling, leading to cell proliferation.

Gastrointestinal Stromal Tumors Differential Diagnosis

- leiomyoma

- leiomyosarcoma

- inflammatory fibroid polyp

- fibromatosis

- schwannoma

- inflammatory myofibrobastic tumor

- solitary fibrous tumor

Gastrointestinal Stromal Tumors Reporting

- one should report size, morphologic type, mitotic count per 50 HPFs , cellular atypia., presence of any necrosis

- MIB count can also assist with reporting as in the past there was a correlation with prognosis, 0-9% MIB =  low, 10-29% intermediate, 30% or higher – high risk.

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Peptic Ulcer

Peptic Ulcers

Most common sites of peptic ulcers

- duodenal (small intestine) THEN gastric (stomach)

- most common site is the duodenum, the first part of the small intestine, where the small intestine emerges from the stomach

Main cause of duodenal ulcers

- Helicobacter pylori bacteria (H.pylori)

Main cause of gastric ulcers

- H.pylori

Peptic Ulcer Pathogenesis

Gastric peptic ulcers

Gastric peptic ulcers result from altered mucosal defenses
- mucosal secretion
- bicarbonate secretion
- epithelial barrier
- blood flow
- prostaglandins

Duodenal peptic ulcers

Duodenal peptic ulcers are associated with increased acid production (H.pylori live in an increased acid, low pH environment)

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Celiac Disease

Celiac Disease

Celiac Disease Pathogenesis

- an autoimmune disorder caused by an immune response to dietary  gluten and related proteins.

- T cell mediated.

Extra-intestinal Celiac Disease Manifestations

- Type I  Diabetes Mellitus, Osteoporosis, Dermatitis herpetiformis and various Neuropathies

- Celiac may in fact be a causative factor in the development of other autoimmune diseases

- Iron and vitamin deficiencies from malabsorption

Neoplastic diseases and Cancers associated with Celiac Disease

- Gastrointestinal lymphoma -  Enteropathy associated T cell lymphoma (EATL)

- 30X increased risk of small bowel adenocarcinoma

- Papillary thyroid cancer and melanoma may also be associated with celiac disease

Celiac Disease Histology features on duodenum biopsy

- villous blunting

- numerous intraepithelilal lymphocytes

- cuboidal or flattened surface with loss of goblet cells

- dense lymphoplasmacytic infiltrate in the lamina propria

- crypt hyperplasia

 Celiac Disease Serum Tests

-anti-transglutaminase antibody
-anti-gliadin antibody

-anti-endomysial antibody

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Melanoma In Situ

Melanoma In Situ

Melanoma in situ.

Melanoma in situ image.

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Dysplastic Nevus

Dysplastic Nevus

Dysplastic nevus of the skin.

Dysplastic mole of the skin.

Dysplastic nevus.

Dysplastic nevus histology.

Dysplastic mole.

Dysplastic nevus melanocytes.

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