Fine needle aspiration cytology of sclerosing adenosis of the breast

OBJECTIVE: To analyze the cytologic findings of sclerosing adenosis of the breast. STUDY DESIGN: We reviewed the fine needle aspiration (FNA) cytologic slides of 7 cases of sclerosing adenosis of the breast and compared the cytologic findings with those of 10 cases of fibroadenoma and 7 cases of fibrocystic change. RESULTS: The smears of sclerosing adenosis were moderately to markedly cellular, consisting of small to large groups of benign epithelial cells arranged with variable architecture. Acinar sheets, scattered individual epithelial cells and small, dense, hyalinized stroma were found in all cases of sclerosing adenosis. Epithelial cells in sclerosing adenosis appeared more frequently as acinar sheets and discohesive individual cells than did those of fibroadenoma (P < .05). However, the branching pattern of epithelial sheets, large sheets and bipolar, naked nuclei were commonly found in fibroadenoma (P < .05). Fibroadenoma had large, hypocellular, fibromyxoid stroma, whereas sclerosing adenosis had small, dense, hyalinized stroma occasionally attached to the epithelial sheets. As compared with fibrocystic change, sclerosing adenosis had similar findings but showed more abundant cellularity, acinar sheets and individual epithelial cells, and the presence of stroma (P < .05). CONCLUSION: Findings of frequent acinar sheets and small, dense, hyalinized stroma attached to epithelial sheets can aid the FNA cytologic diagnosis of sclerosing adenosis. Awareness of the presence of scattered individual epithelial cells in cytologic smears of sclerosing adenosis can help prevent a misdiagnosis of malignancy.     

Fine needle aspiration cytology of neoplasms metastatic to the breast

The fine needle aspiration (FNA) cytologic findings in 18 cases of metastatic neoplasms of the breast are reported. The cases were encountered in a combined series of 2,529 FNA breast biopsies, of which 666 were malignant; the metastatic neoplasms of the breast thus constituted 2.7% of all the malignant breast tumors. The series consists of 15 women and 3 men, with a mean age of 48 years (range of 11 to 73 years). Sixteen biopsies confirmed metastatic malignancy in patients with known extramammary primaries; the prebiopsy clinical diagnoses in six of the patients were benign breast lesions. In eight patients, the clinical differential diagnosis was either a benign or malignant primary breast lesion versus a metastatic malignancy. In two additional patients, the FNA biopsy identified metastatic neoplasms from unsuspected extramammary primaries. The metastatic neoplasms included three small-cell carcinomas of the lung, one squamous-cell carcinoma of the lung, two malignant melanomas, three ovarian malignancies, including a dysgerminoma, and one each of carcinoma of the fallopian tube, endometrial carcinoma, transitional-cell carcinoma of the urinary bladder, prostatic carcinoma, acute granulocytic leukemia, lymphoma, mycosis fungoides, hepatoma and neuroblastoma of the retroperitoneum. Recognition of unusual cytologic patterns raised the suspicion of, or confirmed the diagnosis of, malignancy in all cases, with no false-negative diagnoses. None of the cases were cytologically interpreted as a primary breast malignancy. Ancillary studies performed on the FNA material, including immunocytochemistry, contributed to a definitive diagnosis in three cases. FNA diagnosis of metastatic malignancy of the breast is essential in order to avoid unnecessary mastectomy and to ensure appropriate chemotherapy and/or irradiation treatment.     

Fine needle aspiration cytology diagnosis of lymphoproliferative disease of the breast

OBJECTIVE: To evaluate the role of fine needle aspiration cytology (FNAC) in the diagnosis of lymphoproliferative disease (LPD) of the breast. STUDY DESIGN: Over a period of 20 years (January 1982-December 2001), 13 diagnosed and/or suspected cases of LPD of the breast on FNAC were retrieved and reviewed from the files of the Cytology Laboratory, Department of Pathology, All India Institute of Medical Sciences. For each case, both May-Grünwald-Giemsa- and Papanicolaou-stained smears were reviewed along with hematoxylin and eosin-stained tissue sections and immunohistochemistry, when available. RESULTS: Of the 13 cases, 1 aspirate was from a male breast and the rest were from female. Only 12 cases with documented histology were included in the study. Five of the 12 cases were diagnosed on FNAC as high grade lymphoma, 2 as low grade lymphoma, 2 as poorly differentiated malignant tumor/lymphoma, and 1 each as Hodgkin's lymphoma, acute myeloid leukemia (AML) deposit and immature lymphoid cells, ?leukemia/lymphoma deposit. The tumors manifested mostly as an unilateral mass (10 cases), with 2 cases presenting with bilateral breast lumps. The lymph nodes were involved in 8 cases. Histologically, 2 of the 12 cases were poorly differentiated malignant tumors. Of the remaining 10 cases, 8 were documented as non-Hodgkin's lymphoma and 1 each as Hodgkin's lymphoma, mixed cellularity and AML. CONCLUSION: FNAC is an inexpensive but highly useful diagnostic tool to distinguish between primary lymphoma and carcinoma of the breast. This helps with clinical management in avoiding unnecessary surgical procedures.     

Fine needle aspiration cytology of squamous cell carcinoma of the breast

A rare case of pure squamous cell carcinoma of the breast is reported in which the diagnosis was initially suggested by fine needle aspiration cytology. Smears and cell blocks of the aspirate showed atypical keratinized cells admixed with inflammatory cells. The diagnosis was confirmed by open biopsy. The excised tumor tissue was positive for both estrogen and progesterone receptors; flow cytometry showed a diploid DNA content and a high S-phase fraction.     

Fine needle aspiration cytology of malignant schwannoma metastatic to the breast

A case of malignant schwannoma metastatic to the breast is reported. The tumor was found as a solitary breast lump in a 43-year-old woman and was clinically considered to be a primary tumor. Fine needle aspiration (FNA) smears of the mass were interpreted cytologically as a malignant neurogenic tumor, compatible with a malignant schwannoma. The patient did not have multiple neurofibromatoses. Eight months previously, an excision of a solitary nodule located in the left axilla had been performed in another hospital. Comparison of the histologic section from that excision with the FNA confirmed that the breast tumor was a metastatic malignant schwannoma, and the patient was treated accordingly.     

Fine needle aspiration cytology of extraskeletal chondrosarcoma

The cytologic presentation of a case of extraskeletal chondrosarcoma diagnosed by fine needle aspiration in a 57-year-old asymptomatic female is described. A mass detected on routine chest X ray and defined by CAT scan was subjected to a preoperative percutaneous fine needle aspiration under fluoroscopic guidance; a core biopsy was also obtained. Cytologic findings included pleomorphic malignant cells, with occasional spindle-shaped forms and binucleated and multinucleated cells having various degrees of nuclear atypia. The sarcomatous nature of this neoplasm was readily recognized in the cytologic material, although histologic and ultrastructural studies, which are also illustrated, were necessary to establish its specific histologic type. The biopsy was interpreted as a probable chondrosarcoma, and an exploratory laparotomy revealed a soft tissue tumor arising in the retroperitoneum. A diagnosis of soft tissue chondrosarcoma was rendered. In retrospect, the distinctive cytologic findings in the aspirated material suggest that extraskeletal chondrosarcoma should be considered in the differential diagnosis of soft tissue tumors.