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Skin tumors are non-inflammatory neoplasms that consist of structural elements of the skin that do not tend to regress.
Limited foci with a verrucous surface of a brownish-brown color. May be multiple, there is no favorite localization; sometimes arranged linearly. Nevuses are not subject to treatment. In some cases, removal is carried out for cosmetic reasons, with trauma and a tendency to degenerate. Benign tumors can be removed surgically, electrocoagulation or cryodestruction.
Appears at the age of 30–40 years. Brownish or almost black formations with a papillomatous surface, sharply bounded, covered with oily scales. Rise above the level of healthy skin.
Localization: closed areas of the skin, less often - the face, scalp.
Optional precancrosis that occurs in the elderly and old people. Dense, dry nodules of brownish or gray color, covered with scales, upon removal of which a warty surface is exposed. Prone to peripheral growth with the formation of large plaques. Localization: open areas of the skin (face, back of the hands).
Precancrosis. In elderly people, horn cones of a brownish color on a wide base are localized in open areas (lips, nose, cheeks, auricles).
The occurrence of a peripheral inflammatory zone is one of the signs of malignancy. Keratoacanthoma (sebaceous clam)
It is more common in people over 40 years old. There is a connection with insolation. Single hemispherical nodules or pinkish nodes of unchanged skin, in the center of which there is a recess filled with horny masses.
Localization: open areas of the skin (face, hands). Spontaneous regression is possible.
Precancrosis of the mucous membranes of the oral cavity, less often urogenital organs. The development is facilitated by trauma (dentures, smoking, insolation). The following forms are distinguished: smoker's leukoplakia (nicotine stomatitis), flat, warty and erosive-ulcerative.
The onset is preceded by a limited inflammatory response. Subsequently, the focus becomes dense, elevated, acquires a whitish color. The smooth surface gradually becomes verrucous with cracks and erosion.
Malebis calcified epithelium
A benign tumor developing in the epidermal cyst as a result of an embryonic abnormality of the epidermis. Deep single knot of unchanged skin color, slowly growing. As a result of the deposition of calcium salts, it acquires a dense texture and can turn into a skin osteoma.
Predominant localization: head, limbs.
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- Malignant skin tumors
There are many theories of cancer (embryonic, virusogenetic, hereditary, somatic mutations, etc.). Malignant tumors are characterized by infiltrating growth with destruction of the surrounding tissue and metastasis. There are two types of skin cancer: basal cell and squamous. Basal cell carcinoma, or basal cell carcinoma, occurs primarily in the elderly.
- TUMOR GROWTH. TUMOR PROGRESSION. TUMOR MORPHOGENESIS. INVASION AND METASTASIS OF MALIGNANT TUMORS. BIOMOLECULAR TUMORS MARKERS. ANTITUMOR IMMUNITY. PARANEOPLASTIC SYNDROMES. BASIC PRINCIPLES OF CLASSIFICATION OF TUMORS. MORPHOLOGICAL FEATURES OF TUMORS FROM EPITELIUM AND TUMORS FROM TISSUES - DERIVATED MESENCHIMES
TUMOR GROWTH. TUMOR PROGRESSION. TUMOR MORPHOGENESIS. INVASION AND METASTASIS OF MALIGNANT TUMORS. BIOMOLECULAR TUMORS MARKERS. ANTITUMOR IMMUNITY. PARANEOPLASTIC SYNDROMES. BASIC PRINCIPLES OF CLASSIFICATION OF TUMORS. MORPHOLOGICAL FEATURES OF TUMORS FROM EPITELIUM AND TUMORS FROM TISSUES - DERIVATIVES
- Tumors of the glands of the skin and hair follicle
Tumors of sweat glands Tumors originating from eccrine (eccrine pore rum, eccrine spiradenoma, syringoepithelioma) and apocrine glands (syringoma, syringoadenoma, papillary hydroadenoma, syringocystadenoma). Develop from the excretory ducts of the sweat glands. Most of them are single hemispherical formations of the color of unchanged skin or slightly erythematous, not prone to ulceration
- Neoplasia (tumor) of the skin
Neoplastic processes in the skin of cats can be benign and malignant. Their differentiation in appearance is very complicated, therefore, in any case, specialist consultation and additional laboratory
- Tumors of the skin, developing from the "new" cell elements
Some skin neoplasms come from cells whose precursors are located in various tissues of the body, and these cells themselves are “newcomers” to the skin and adapted to life in this organ. An example is white adolescent epidermocytes (Langerhans cells). They arise from precursors located in the bone marrow, and then, being already in differentiated
- MESENCHYMAL TUMORS. TUMORS OF MELANINE-FORMING I FABRIC. TUMORS OF THE CENTRAL NERVOUS SYSTEM, BRAIN CELLS AND PERIPHERAL NERVES
MESENCHYMAL TUMORS. TUMORS OF MELANINE-FORMING I FABRIC. TUMORS OF THE CENTRAL NERVOUS SYSTEM, BRAIN CELLS AND PERIPHERAL
- Tumors: definition, nomenclature, classification. Tumor growth and molecular foundations of carcinogenesis. Tumors from the epithelium.
1. The main theories of tumor growth 1. inflammatory 2. dysontogenetic 3. viral genetic 4. chemical carcinogens 5. physical carcinogens 2. Activation mechanisms of cellular oncogenes 1. alteration 2. regeneration 3. proliferation 4. amplification 5. point mutation 3. Stages chemical carcinogenesis 1. promotion 2. initiation 3. alteration 4. proliferation 5. tumor progression 4.
- Mesenchymal tumors. Tumors of melanin-forming tissue
Mesenchymal tumors are tumors that develop from derivatives of mesenchyme - connective, vascular, muscle, fat, bone, cartilage, synovial membranes, fascia, tendons, aponeurosis. Among benign mesenchymal tumors, there are: 1) tumors of fibrous tissue — fibroma and dermatofibroma (histiocytoma); 2) adipose tissue tumors - lipoma, intramuscular
- Tumors of the mesenchymal tissue Adipose tissue tumors
Lipoma. Benign tumor. The knot is the color of unchanged skin or a yellowish tint, soft, often lobed, painless. Often, multiple tumors. Fibrolipoma. Fibrous tissue develops, in connection with which the tumor has a dense consistency. Liposarcoma Multiple nodes or diffuse infiltration in the subcutaneous tissue without a clear outline. The course is malignant. Metastases in
- The main groups of skin diseases
Infectious and parasitic skin diseases. Although the skin is a powerful protective organ, its barrier function can be disrupted by microorganisms and parasites (table. 37.7). With unstable immunity, banal skin infections, manifested by abscesses, carbuncles or boils, can be life-threatening. Table 37.6 1. Infectious and parasitic diseases 2. Acute and chronic dermatitis
- MALIGNANT SKIN MELANOMA
Thomas B. Fitzpatrick, Arthur J. Sober, Martin S. Mime Primary malignant melanoma of the skin is the most common cause of death from all skin cancers, so identifying its early signs is a priority for any doctor, regardless of specialist profile. Every time the doctor has the opportunity to examine the patient’s skin, he should
- Skin lymphomas
(hemoderma - old). These are tumor non-leukemic lesions of the lymphoid-reticular system of the skin. It begins with skin lesions, then acquires a systemic character. The etiology is not clarified. They suggest HIV, immunopathology, a hereditary predisposition. Classification (Raznotovsky; in the world more than 100.) 1) with slow progression: a) monomorphic: - three-stage form; - poikilodermic form; -