Mast cell changes, numbers and degranulations, of 264 cases of skin biopsy lesions were studied. An increase of mast cells was noted in congenital diseases; noninfectious erythematous, papullar, and squamous diseases; vascular diseases; bacterial diseases; fungal diseases; lipidoses; metabolic diseases; connective tissue diseases; tumors and cysts of the epidermis; tumors of epidermal appendages; tumors of fibrous tissue; tumors of vascular tissue; and benign tumors of melanocytes. The increase was noted mainly in the surrounding areas of the lesions rather than within the lesions. In only a few conditions; vascular diseases, connective tissue diseases, and tumors of vascular tissue, an increase of mast cells within the lesion was noted. With regard to the relation between mast cell changes and gross appearance of skin lesions, an increase of mast cells was observed in the surrounding areas of scally, vesicular, nodular or warty, and ulcerated lesions. Relationship between the degree of degranulation to the types of skin disease or gross appearance can not be clearly established. In all conditions, the increase of mast cells was intimately associated with formation of new fibrous connective tissue.
Cytoplasmic Granules/pathology ; Human ; Mast Cells/pathology* ; Skin Diseases/pathology*

Köebner phenomenon, also known as isomorphic response, originally refers to the erythemas and scales resulted from skin traumas. The similar phenomenon later was observed in many other diseases. This article reviews classification, etiopathogenisis, pathogenesis, clinical manifestation, and application of KP.
Humans ; Psoriasis ; pathology ; physiopathology ; Risk Factors ; Skin ; injuries ; pathology ; physiopathology ; Skin Diseases ; pathology ; physiopathology

OBJECTIVETo study the clinical characteristics and pathogenesis of hematidrosis.

METHODSDetailed clinical manifestations and natural history of a patient with hematidrosis were presented. A series of laboratory examinations were performed, and skin pathohistologic features and ultra microscopic structures were observed.

RESULTSThe episodes of skin bleeding occurred on any site of the body spontaneously and promptly. The skin surface bloody extravasation has identical cell components as that of peripheral blood. All the results of laboratory tests were normal except a positive Trousseau's test. Skin pathohistological study revealed some intradermal bleeding and emphraxised capillaries. No abnormality was found in sweat glands, hair follicles and sebaceous glands.

CONCLUSIONThe pathological basis for hematidrosis might be a distinctive vasculitis.

Child ; Female ; Hemorrhage ; pathology ; Humans ; Skin ; blood supply ; pathology ; Skin Diseases ; pathology

Calcinosis cutis involves the inappropriate deposition of calcium within the dermis layer of the skin, and is often associated with rheumatoid disease. A 42-year-old woman presented for evaluation of a hard palpable mass on the left upper eyelid. After everting the eyelid, a large papillomatous mass with a broad base was identified on the superior area of the tarsus. The lesion was partially excised posteriorly under local anesthesia, and pathologists identified the mass as calcinosis cutis. The patient had no systemic or trauma history, and the serum levels of calcium and phosphorous were normal. Idiopathic calcinosis cutis should be included in the differential diagnosis for a protruding papillomatous mass of the tarsal plate, and surgical debulking could be a viable option for large protruding lesions, although more follow-up is necessary to monitor regrowth.
Adult ; Calcinosis/*pathology/surgery ; Eyelid Diseases/*pathology/surgery ; Female ; Humans ; Skin Diseases/*pathology/surgery

Malignant transformation of mature cystic teratoma of the ovary can develop with an incidence of 1-2%. Squamous cell carcinoma is the most common malignant tumor arising in benign cystic teratoma. The authors have recently experienced a case of combined microcystic adnexal carcinoma and squamous cell carcinoma arising in a benign cystic teratoma of the ovary in a 72-year-old Korean woman. The right ovarian cystic mass had been ruptured and firmly adhered with salpinx and omental fat tissue on operation. Thickened cystic wall with yellowish white solid infiltrative lesion was noted grossly, and two different malignant tumors of microcystic adnexal carcinoma exhibiting both eccrine and hair follicular differentiation and squamous cell carcinoma were observed microscopically. PAS and CEA positivities suggested eccrine differentiation in areas of microcystic adnexal carcinoma.
Aged ; Carcinoma, Skin Appendage/*pathology ; Carcinoma, Squamous Cell/*pathology ; Case Report ; Female ; Human ; Neoplasms, Multiple Primary/*pathology ; Ovarian Neoplasms/*pathology ; Skin Diseases/*pathology ; Skin Neoplasms/*pathology ; Teratoma/*pathology

Back ; pathology ; Collagen ; Fibrosis ; diagnosis ; pathology ; Humans ; Male ; Middle Aged ; Skin Diseases ; diagnosis ; pathology ; Thorax ; pathology

Adult ; Humans ; Male ; Plasma Cells ; pathology ; Skin Diseases ; diagnosis

The Korean list of occupational skin diseases was amended in July 2013. The past list was constructed according to the causative agent and the target organ, and the items of that list had not been reviewed for a long period. The revised list was reconstructed to include diseases classified by the International Classification of Diseases (10th version). Therefore, the items of compensable occupational skin diseases in the amended list in Korea comprise contact dermatitis; chemical burns; Stevens-Johnson syndrome; tar-related skin diseases; infectious skin diseases; skin injury-induced cellulitis; and skin conditions resulting from physical factors such as heat, cold, sun exposure, and ionized radiation. This list will be more practical and convenient for physicians and workers because it follows a disease-based approach. The revised list is in accordance with the International Labor Organization list and is refined according to Korean worker's compensation and the actual occurrence of occupational skin diseases. However, this revised list does not perfectly reflect the actual status of skin diseases because of the few cases of occupational skin diseases, incomplete statistics of skin diseases, and insufficient scientific evidence. Thus, the list of occupational diseases should be modified periodically on the basis of recent evidence and statistics.
Burns, Chemical/pathology ; Dermatitis, Contact/pathology ; Humans ; Occupational Diseases/*economics ; Occupational Exposure ; Republic of Korea ; Skin/*pathology ; Skin Diseases/*economics/*pathology ; Skin Diseases, Infectious/pathology ; Stevens-Johnson Syndrome/pathology ; Vitiligo/pathology ; Workers' Compensation/*economics

Membranous lipodystrophy represents a peculiar type of fat necrosis that is present in patients with various types of skin disease. It is characterized by the presence of microcysts and macrocysts and is lined by amorphous eosinophilic material with a crenelated arabesque appearance. These findings have been associated with lupus erythematosus, diabetes mellitus, erythema nodosum, trauma, etc. We report a case of a 43-year-old woman who had a red to purple asymptomatic indurated plaque, approximately seven cm in diameter and on the left arm. She was a chronic hepatitis B antigen carrier and had hypertension for four years. Histopathology of the biopsied lesion showed transepidermal elimination of altered collagen and elastic fibers, as well as membranous lipodystrophy changes. There were hypertensive vascular changes including lymphohistiocytic infiltration around the vascular wall, swelling of endothelial cells, increased thickness of the vascular walls, and narrowing of the lumen. We report a case showing transepidermal elimination with membranous lipodystrophy. We carefully suggest that the secondary phenomenon of transepidermal elimination was associated with membranous lipodystrophy and degenerate connective tissues.
Skin Diseases/*pathology ; Lipodystrophy/*complications/*pathology ; Hypertension/*complications ; Humans ; Female ; Epidermis/*pathology ; Adult

Objective: To investigate the clinicopathological features, diagnosis and differential diagnosis of ectopic meningothelial hamartoma (EMH). Methods: Three cases of EMH diagnosed in the First Affiliated Hospital of Nanjing Medical University from January 2014 to December 2020 were enrolled. All cases were evaluated by clinical and imaging features, HE and immunohistochemical staining, and the relevant literature was reviewed. Results: There were one male and two female patients, aged 2, 67 and 19 years, respectively. Clinically, they presented as skin masses in the head and face region (two cases) and sacro-coccygeal region (one case). Grossly, the lesions ranged in size from 1.6 cm to 8.9 cm. Microscopically, the lesions were ill-defined, and located in the dermis and subcutis, and showed pseudovascular channels lined by monolayer of cuboidal to flattened epithelium with mild atypia, with variable cystic cavity formation. There was prominent interstitial fibrosis. Concentric, lamellated, onion skin-like arrangement with short spindle or ovoid cells and psammoma bodies were noted. Immunohistochemically, these cells were strongly positive for SSTR2, EMA, vimentin and progesterone receptor. Ki-67 positive index was low, approximately 1%. Conclusions: EMH is uncommon. Definitive diagnosis relies on histopathologic examination. The importance in recognizing the lesions is to differentiate from other more aggressive tumors.
Choristoma/pathology* ; Diagnosis, Differential ; Female ; Hamartoma/pathology* ; Humans ; Male ; Meninges ; Skin Diseases/pathology*