Trichoepitheliomas are benign follicular appendage tumors with differentiation to all three segments of the hair follicle.A 2 years old female domestic short hair cat presented with a mass on the tail.The mass was sur...Trichoepitheliomas are benign follicular appendage tumors with differentiation to all three segments of the hair follicle.A 2 years old female domestic short hair cat presented with a mass on the tail.The mass was surgically excised and for histopathologic and immunohistochemical studies,was sent to Department of Pathology.Histologically,the tumor was encapsulated and consisted of many islands of follicular epithelium and also cysts structures which varied in size and shape.The cells of epithelium islands were round to oval and had variable amounts of slightly,eosinophilic cytoplasm and euchromatic nuclei.The cystic structures were lined by a complex layer of squamous epithelium.Often,cells under went an abrupt transition between basal layers and keratinization without the development of a granular cell layer.No tendency of malignancy was seen in this case.According to mentioned characteristics,trichoepitlielioma was diagnosed.By immunohistochemical study it was confirmed that this tumor had epithelial origin because squamous tumor cells reacted with the pan-cytokeratin antibody.The expression of p-catenin was predominately cytoplasmic and also together with numerous positive nuclei but membranous expression was inconsistenet.Distribution of neoplastic cells with P-catenin expression was more than 75%and labeling intensity was strong in both cytoplasm and nuclei.According to author's knowledge,this is the first report of trichoepithelioma in cat in Iran and also investigation of P-catenin expression in feline trichoepithelioma in veterinary literature.展开更多
Background: Basal cell carcinoma (BCC) and trichoepithelioma (TE) have some similarities clinically and histologically. The aim of this work is to evaluate the role of Bcl-2, CD10 and CD34 in differentiation between B...Background: Basal cell carcinoma (BCC) and trichoepithelioma (TE) have some similarities clinically and histologically. The aim of this work is to evaluate the role of Bcl-2, CD10 and CD34 in differentiation between BCC and TE. Methods: The immunohistochemical expression of Bcl-2, CD10 and CD34 was evaluated in 20 BCCs and 12 TEs in a retrospective study. The localization of these markers in tumor and stromal cells was determined and comparison between BCC and TE was done. Immunohistochemistry for Bcl-2, CD10 and CD34 was performed on sections obtained from formalin-fixed, paraffin-embedded blocks. Bcl-2, CD10 and CD34 immunoreactivity in the stromal and/or tumor cells was determined as follows: negative (0);1+ (10% - 50% positive cells);and 2+ (>50% positive cells). Results: In BCC (20 cases), the expression of Bcl-2 in stromal cells showed (0) immunoreactivity in 8 cases (40%), (1+) immunoreactivity in 7 cases (35%), and (2+) immunoreactivity in 5 cases (25%). Tumoral cells showed diffuse positivity in 20 out of 20 cases (100%), (1+) immunoreactivity in 5 cases (25%) and (2+) immunoreactivity in 15 cases (75%). On the other hand, the expression of Bcl2 in TE, 4 cases showed positive stromal cells out of 12 (33.33%), (1+) immunoreactivity in 2 cases (16.6%) and (2+) immunoreactivity in 2 cases (16.6%), and 8 cases showed no immunoreactivity. Tumoral cells showed positivity in 12 out of 12 cases (100%), (1+) immunoreactivity in 5 cases (41.6%), (2+) immunoreactivity in 7 cases (58.3%). In BCC cases, the expression of CD10 was noted in stromal cells in 8 out of 20 cases (40%), 5 cases showed positivity in stromal and basaloid cells and 3 cases showed positivity in stromal cells only, and 12 cases showed no immunoreactivity (60%). Tumor cells showed positivity in 11 cases out of 20 (55%), (1+) immunoreactivity in 6 cases (30%), (2+) in 5 cases (25%), and 9 cases showed no immunoreactivity (45%). On the other hand, the expression of CD10 in TE 7 cases showed positive stromal cells out of 12 (58.33%), (1+) immunoreactivity in 5 cases (41.6%) and (2+) in 2 cases (16.6%), and 5 cases showed no immunoreactivity (41.66%). Tumor cells showed positivity in 5 cases out of 12 (41.66%), (1+) immunoreactivity in 4 cases (33.33%) and (2+) in 1 case (8.3%), and 7 cases showed no immunoreactivity (58.33%). In BCC cases, the expression of CD34 was noted in stromal cells in14 cases out of 20 cases (70%), (1+) immunoreactivity in 10 cases (50%) and (2+) in 4 cases (20%), and 6 cases showed no immunoreactivity (30%). On the other hand, the expression of CD34 in TE, 10 cases showed positive stromal cells out of 12 (83.33%), (1+) immunoreactivity in 6 cases (50%) and (2+) in 4 cases (33.33%), and 2 cases showed no immunoreactivity (16.6%). Tumor cells showed no immunoreactivity for CD 34 in both BCC and trichoepithelioma, (100%) negative tumor cells. Significant difference of tumor\stromal cells immunoreactivity for Bcl-2 and CD34 in both BCC and TE but it was insignificant for CD10. Conclusion: We conclude that Bcl-2 CD10, CD34 are useful markers in the differential diagnosis of BCC versus TE.展开更多
Multiple familial trichoepithelioma is a rare autosomal dominant skin disease that presents as many small tumours predominantly on the face. They are benign skin tumours of hair follicle differentiation. We report mul...Multiple familial trichoepithelioma is a rare autosomal dominant skin disease that presents as many small tumours predominantly on the face. They are benign skin tumours of hair follicle differentiation. We report multiple familial trichoepithelioma occurring in two members of the same family.展开更多
文摘Trichoepitheliomas are benign follicular appendage tumors with differentiation to all three segments of the hair follicle.A 2 years old female domestic short hair cat presented with a mass on the tail.The mass was surgically excised and for histopathologic and immunohistochemical studies,was sent to Department of Pathology.Histologically,the tumor was encapsulated and consisted of many islands of follicular epithelium and also cysts structures which varied in size and shape.The cells of epithelium islands were round to oval and had variable amounts of slightly,eosinophilic cytoplasm and euchromatic nuclei.The cystic structures were lined by a complex layer of squamous epithelium.Often,cells under went an abrupt transition between basal layers and keratinization without the development of a granular cell layer.No tendency of malignancy was seen in this case.According to mentioned characteristics,trichoepitlielioma was diagnosed.By immunohistochemical study it was confirmed that this tumor had epithelial origin because squamous tumor cells reacted with the pan-cytokeratin antibody.The expression of p-catenin was predominately cytoplasmic and also together with numerous positive nuclei but membranous expression was inconsistenet.Distribution of neoplastic cells with P-catenin expression was more than 75%and labeling intensity was strong in both cytoplasm and nuclei.According to author's knowledge,this is the first report of trichoepithelioma in cat in Iran and also investigation of P-catenin expression in feline trichoepithelioma in veterinary literature.
文摘Background: Basal cell carcinoma (BCC) and trichoepithelioma (TE) have some similarities clinically and histologically. The aim of this work is to evaluate the role of Bcl-2, CD10 and CD34 in differentiation between BCC and TE. Methods: The immunohistochemical expression of Bcl-2, CD10 and CD34 was evaluated in 20 BCCs and 12 TEs in a retrospective study. The localization of these markers in tumor and stromal cells was determined and comparison between BCC and TE was done. Immunohistochemistry for Bcl-2, CD10 and CD34 was performed on sections obtained from formalin-fixed, paraffin-embedded blocks. Bcl-2, CD10 and CD34 immunoreactivity in the stromal and/or tumor cells was determined as follows: negative (0);1+ (10% - 50% positive cells);and 2+ (>50% positive cells). Results: In BCC (20 cases), the expression of Bcl-2 in stromal cells showed (0) immunoreactivity in 8 cases (40%), (1+) immunoreactivity in 7 cases (35%), and (2+) immunoreactivity in 5 cases (25%). Tumoral cells showed diffuse positivity in 20 out of 20 cases (100%), (1+) immunoreactivity in 5 cases (25%) and (2+) immunoreactivity in 15 cases (75%). On the other hand, the expression of Bcl2 in TE, 4 cases showed positive stromal cells out of 12 (33.33%), (1+) immunoreactivity in 2 cases (16.6%) and (2+) immunoreactivity in 2 cases (16.6%), and 8 cases showed no immunoreactivity. Tumoral cells showed positivity in 12 out of 12 cases (100%), (1+) immunoreactivity in 5 cases (41.6%), (2+) immunoreactivity in 7 cases (58.3%). In BCC cases, the expression of CD10 was noted in stromal cells in 8 out of 20 cases (40%), 5 cases showed positivity in stromal and basaloid cells and 3 cases showed positivity in stromal cells only, and 12 cases showed no immunoreactivity (60%). Tumor cells showed positivity in 11 cases out of 20 (55%), (1+) immunoreactivity in 6 cases (30%), (2+) in 5 cases (25%), and 9 cases showed no immunoreactivity (45%). On the other hand, the expression of CD10 in TE 7 cases showed positive stromal cells out of 12 (58.33%), (1+) immunoreactivity in 5 cases (41.6%) and (2+) in 2 cases (16.6%), and 5 cases showed no immunoreactivity (41.66%). Tumor cells showed positivity in 5 cases out of 12 (41.66%), (1+) immunoreactivity in 4 cases (33.33%) and (2+) in 1 case (8.3%), and 7 cases showed no immunoreactivity (58.33%). In BCC cases, the expression of CD34 was noted in stromal cells in14 cases out of 20 cases (70%), (1+) immunoreactivity in 10 cases (50%) and (2+) in 4 cases (20%), and 6 cases showed no immunoreactivity (30%). On the other hand, the expression of CD34 in TE, 10 cases showed positive stromal cells out of 12 (83.33%), (1+) immunoreactivity in 6 cases (50%) and (2+) in 4 cases (33.33%), and 2 cases showed no immunoreactivity (16.6%). Tumor cells showed no immunoreactivity for CD 34 in both BCC and trichoepithelioma, (100%) negative tumor cells. Significant difference of tumor\stromal cells immunoreactivity for Bcl-2 and CD34 in both BCC and TE but it was insignificant for CD10. Conclusion: We conclude that Bcl-2 CD10, CD34 are useful markers in the differential diagnosis of BCC versus TE.
文摘Multiple familial trichoepithelioma is a rare autosomal dominant skin disease that presents as many small tumours predominantly on the face. They are benign skin tumours of hair follicle differentiation. We report multiple familial trichoepithelioma occurring in two members of the same family.
