ABSTRACT
The hippocampus is a central area of the memory-related neural system. Combined immunohistochemistry against choline acetyl transferase and retrograde transneuronal labelling of the pseudorabies virus were used to identify cholinergic neurons in the central nervous system projecting to the hippocampal formation of the rat. Five to ten microL of Bartha strain of pseudorabies virus were injected into the dentate gyrus, CA1 and CA3 of the hippocampus of 20 Sprague Dawley rats using stereotaxic instrument. Forty eight to 96 hr after the injection, the brains were removed and the tissue sections were processed for double immunofluorescence procedure using polyclonal antibodies against pseudorabies virus or choline acetyl transferase. The double labelled neurons were distributed at several different nuclei and the labelling patterns of three different areas of the hippocampus were similar. These data suggests that the cholinergic innervation to the hippocampus were distributed in a transsynaptic manner throughout the whole brain area.
Subject(s)
Rats , Animals , Antibodies , Choline O-Acetyltransferase/analysis , Cholinergic Fibers/enzymology , Herpesvirus 1, Suid/immunology , Hippocampus/cytology , Immunohistochemistry , Microinjections , Neural Pathways , Rats, Sprague-DawleyABSTRACT
Carcinomatous degeneration of chronic scars, known as Marjcinulcer, are relatively rare. The majority of them are quamous cell carcinoma or other skin cancers including basal cell carcinoma. But malignant melanone, especially amelanotic melanoma oveloping from a chronic burn scar is extremely rare. We have experiencedl a case of amelanotic melanoma arising ron a chronic burn scar in a patient, 53 year-old female, who had a painful erythematous ulcra edonodule on the left heel for about 20 years since she had sustained a burn there at the age of 1 year. Although there are no melanin pigments in hematoxylinsin(H & E) stain as well a Fontana Masson stain, a biopsy specimen from the skin lesion revealed cytologic atypia and junctional activity in the dermoepidermal junction arcl positive immunohistochemical staier, for S-100 protein, which is consistent with amelanotic melanoma. lesion was widely excised and a skin graft was dure She was also treated with intralesional BCG injection and recurrence or metastasis was ot detected during the follow up period of 6 months.
Subject(s)
Female , Humans , Middle Aged , Biopsy , Burns , Carcinoma, Basal Cell , Cicatrix , Follow-Up Studies , Heel , Melanins , Melanoma, Amelanotic , Mycobacterium bovis , Neoplasm Metastasis , Recurrence , S100 Proteins , Skin , Skin Neoplasms , TransplantsABSTRACT
Subungual exostosis are not uncommon, however, they are infrequently mentioned in the dermatologic literature. We report herein a rase of subungual exostosis in the great toe of 16-year-old female student which was confirmed by histopathologic and radiologic findings. Histopathologic examination showed that the mass was ooeered by a dense fibrous tissue which merged into a fibrocartilage cap and bone. Computed tomography showed a well defined, oval shaped, radiopacity of bony density capped by a radiolucency.
Subject(s)
Adolescent , Female , Humans , Exostoses , Fibrocartilage , ToesABSTRACT
We report a case of congenital vellus hamartoma, which consists of numerous matured vellus hair follicles and sebaceous glands. This patient is 4-month-old male with multiple, variable sized nodules on the right epicanthsl fold area since birth. Histopathologically, some of the infundibular portion of the vellus hair shows irregular and reticulated hyperplasia. There are numerous well-formed vellus hair follicles surrounded with thick fibrous sheath and some of them are associated with rudiment sebaceous glands.
Subject(s)
Humans , Infant , Male , Hair , Hair Follicle , Hamartoma , Hyperplasia , Parturition , Sebaceous GlandsABSTRACT
We report herein a case of subcutaneous granuloma annulare occured in a 3-year-old girl who had 7 subcutaneous nodules on the scalp, lumbar area, buttock, right tibial area and both ankles. liistopathologically, multiple foci of complete and incomplete collagen degeneration surrounded by histiocytes in a palisading arrangement were seen in the subcutaneous layer. Some vessel walls were thickened and infiltrated with inflammatory cells and many eosinophils were scattered among the inflamrnatory cell infiltrate around the palisaiing granuloma. Five of the lesions disappeared spontaneously and other s decreased in size without specific treatment in 2 months.