ABSTRACT
The aim of this report is to describe the first histopathological, immunohistochemical, and clinical characteristics of a feline glycogen-rich clear cell carcinoma (GRCCC). A Persian queen was admitted with mammary gland tumors and underwent radical unilateral mastectomy. Overall survival was considered 33 days and death was due to clinical evolution of the disease. Microscopic evaluation demonstrated epithelial cells arranged in a predominantly solid pattern, tumor cells presented an ample, granular, and foamy clear cytoplasm, and moderate cellular pleomorfism. The presence of cytoplasmatic glycogen was confirmed through diastase digestion followed by PAS staining. Histopathological and histochemical findings lead to the diagnosis of GRCCC with regional metastases.(AU)
O objetivo deste relato de caso é descrever as características clínicas, histopatológicas e imuno-histoquímicas do primeiro carcinoma mamário de células claras rico em glicogênio em felino. Uma gata persa foi atendida com tumores na glândula mamária e foi submetida à mastectomia radical unilateral. A sobrevida livre de doença foi considerada 33 dias, e o óbito foi devido à evolução da doença. A avaliação microscópica demonstrou células epiteliais arranjadas em um padrão predominantemente sólido, as células tumorais apresentaram um citoplasma claro, amplo, granular e espumoso e pleomorfismo celular moderado. A presença do glicogênio citoplasmático foi confirmada pela digestão pela diástase, seguida da coloração de PAS. Achados histopatológicos e histoquímicos levaram ao diagnóstico de carcinoma de células claras rico em glicogênio felino com metástase regional.(AU)
Subject(s)
Animals , Cats , Adenocarcinoma, Clear Cell/veterinary , Glycogen/analysis , Mammary Neoplasms, Animal/pathology , Amylases/analysisABSTRACT
Glycogen-rich clear cell carcinoma of the breast is a very rare malignancy whose incidence is about 1~3% of the total breast cancers. Histologic features are usually those of ductal carcinoma, but it contains the cells that is characterized by the abundant cytoplasm and centrally-located nuclei. We report a case of glycogen-rich clear cell carcinoma of the breast. The case is a 63-year-old woman with a palpable lump of the right breast. The operation is partial mastectomy with axillary lymph node dissection. The tumor consists of round or polygonal cells. The cell membranes are distinct, and the cytoplasm is clear. Most of the nulcei are centrally-located and hyperchromatic. The tumor cells are PAS positive and D-PAS negative. Immunohistochemically, the tumor cells are positive to the epithelial membrane antigen (EMA), and negative to vimentin, smooth muscle actin, desmin. Estrogen receptors are positive, but progesterone receptors are negative.
Subject(s)
Female , Humans , Middle Aged , Actins , Breast , Carcinoma, Ductal , Cell Membrane , Cytoplasm , Desmin , Incidence , Lymph Node Excision , Mastectomy, Segmental , Mucin-1 , Muscle, Smooth , Receptors, Estrogen , Receptors, Progesterone , VimentinABSTRACT
Glycogen-rich clear cell carcinoma of the breast is an unusual variant of carcinoma with a recorded incidence of 1.4-3% of breast carcinomas. The cytologic characteristics have not been well described. We report two cases of glycogen-rich clear cell carcinoma with corresponding fine needle aspiration(FNA) cytologic findings and compare them to infiltrating ductal carcinoma and other clear cell malignancies with a review of literature. One was a 62-year-old woman exhibiting a palpable mass of the right breast. The smears showed atypical tight cell clusters and individually scattered single cells containing foamy or clear abundant cytoplasm with well defined cytoplasmic margins. Mild to moderate nuclear pleomorphism and a prominent nucleolus were present. The other was a 42-year-old woman who was admitted with a right breast mass. The smears showed moderately cellular, tightly cohesive tumor cells. The cytoplasmic outline was generally well demarcated. The tumor cells contained foamy to clear abundant cytoplasm with large and small vacuoles. The nuclear pleomorphism was marked. Both tumors resected by modified radical mastectomy, were diagnosed as glycogen-rich clear cell carcinoma. Histologically, the clear cell nature of tumor cells were not characteristic enough to predict this type of the tumor. Some cytologic features can be distinguished other clear cell breast cancer from glycogen-rich carcinoma. Recognition of these unusual patterns in a breast FNAC should raise the suspicion of a clear cell carcinoma including glycogen-rich subtype. Cytological localization of glycogen using PAS and D-PAS staining may permit the correct identification and differential diagnosis of this tumor.