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Featured researches published by Masafumi Tsuzuku.


Acta Cytologica | 2001

Peripheral primitive neuroectodermal tumor of the vulva: Report of a case with imprint cytology

Nobuhiro Takeshima; Tsutomu Tabata; Hidetaka Nishida; Noriyuki Furuta; Masafumi Tsuzuku; Yasuo Hirai; Katsuhiko Hasumi

BACKGROUND Peripheral primitive neuroectodermal tumor (PNET) of the vulva is an extremely rare disease, and, to our knowledge, only two cases have been previously reported. CASE A 45-year-old woman presented with a mass in the right labium major. Three years after removal of the tumor, she noticed a new lesion in the same place and underwent a partial vulvectomy. The imprint cytology of the recurrent tumor showed a monomorphic appearance, composed of small round cells with scant cytoplasm against a hemorrhagic background. These tumor cells were loosely connective, but rosettelike structures were observed focally. On pathologic examination, the neoplasm was composed of small round tumor cells showing sinusoidal, diffuse or micropapillary growth. Immunohistochemically, the neoplastic cells stained positively for neuron-specific enolase, vimentin and HBA 71 and negatively for cytokeratin, HBA 45 and muscle-specific actin. The morphologic characteristics of the disease were well expressed in the imprint cytology, and this influenced the selection of immunohistochemical studies. CONCLUSION Cytologic examination for vulvar tumors, even imprint cytology, can be a useful tool in obtaining an accurate pathologic diagnosis of a rare disease, such as peripheral PNET.


Acta Cytologica | 1999

Morphologic Analyses of Positive Peritoneal Cytology in Endometrial Carcinoma

Kenji Yanoh; Nobuhiro Takeshima; Yasuo Hirai; Atsuko Minami; Masafumi Tsuzuku; Nagayasu Toyoda; Katsuhiko Hasumi

OBJECTIVE To investigate the relationship between the morphologic features of endometrial adenocarcinoma cells in peritoneal fluids (effusions and washings) and macroscopic intraabdominal adenocarcinoma at laparotomy as well as prognosis. STUDY DESIGN Seventy-one patients with endometrial adenocarcinoma who showed positive peritoneal cytology at laparotomy were clinically divided into three groups: 25 patients with macroscopic neoplastic seeding in the peritoneal cavity (type 1), 38 patients without macroscopic peritoneal metastasis who survived with no evidence of disease (type 2) and 8 patients without macroscopic peritoneal metastasis who later developed recurrence of adenocarcinoma (type 3). Morphologic features of the adenocarcinoma cells in smears of peritoneal fluids were examined. RESULTS Most of the smears from type 1 patients showed moderate to high cellularity, scalloped edges of cell clusters and isolated adenocarcinoma cells, whereas these features were seldom observed in type 2 patients. Although not all type 3 patients demonstrated these three features, patients in the series whose specimens exhibited none of the three features did not show any peritoneal lesions or have a recurrence of their disease. CONCLUSION The finding of endometrial adenocarcinoma cells exhibiting high cellularity, scalloped edge of cell clusters and isolated cells in smears of peritoneal fluid is associated with the presence of intraabdominal macroscopic metastatic lesions and could be regarded as a risk factor for intraabdominal recurrence of carcinoma.


Acta Cytologica | 2001

Identification of a high-risk subgroup in cytology-positive stage IIIA endometrial cancer

Kenji Yanoh; Nobuhiro Takeshima; Yasuo Hirai; Atsuko Minami; Masafumi Tsuzuku; Nagayasu Toyoda; Katsuhiko Hasumi

OBJECTIVE To identify a high-risk subgroup among patients with cytology-positive stage IIIA endometrial cancer. STUDY DESIGN Fifty-four stage IIIA endometrial cancer patients who were positive only on peritoneal cytology were divided into two groups based on the cytologic pattern of their peritoneal smears. In group A, malignant cell clusters had well-defined edges, while the tumor cell clusters had scalloped edges in group B. The prognostic significance of these findings was investigated. RESULTS The five-year disease-free survival rate was 97.5% in group A (n=40) versus 50% in group B (n = 14). Multivariate analysis confirmed that the cytologic pattern had an independent influence on survival. CONCLUSION Positive peritoneal cytology composed of malignant cell clusters with well-defined edges has no impact on survival. Only endometrial cancer patients who show tumor cell clusters with scalloped edges in peritoneal smears are worth considering for upstaging.


Acta Cytologica | 2001

Müllerian adenosarcoma of the uterus: report of a case with imprint cytology.

Nobuhiro Takeshima; Tsutomu Tabata; Hidetaka Nishida; Yuji Arai; Masafumi Tsuzuku; Yasuo Hirai; Kazuhiro Yamauchi; Katsuhiko Hasumi

BACKGROUND Müllerian adenosarcoma is a rare morphologic variant of uterine sarcoma that, although well described histologically, is scarcely mentioned in the cytologic literature. CASE A 75-year-old female was suspected of having atypical endometrial hyperplasia on an endometrial smear. However, subsequent imaging techniques revealed the presence of a bulky, polypoid mass filling the uterine cavity. On pathologic examination of the hysterectomy specimen, the polypoid tumor was diagnosed as mullerian adenosarcoma, homologous, with sarcomatous overgrowth, in which the sarcomatous component was compatible with high grade endometrial stromal sarcoma. Imprint smears of the tumor consisted of two morphologic patterns, sarcomatous and glandular. The sarcomatous tumor cells, with coarse chromatin and relatively scant cytoplasm, formed small aggregates or appeared alone. These cells were semiround or oval and had conspicuous nucleoli. In addition to these observations, small and large clusters of glandular cells with mild atypism were interspersed with the sarcomatous cells. CONCLUSION Cytologic examination of müllerian adenosarcoma well reflects its pathologic features.


The Journal of the Japanese Society of Clinical Cytology | 2005

Cytomorphologic differentiation between large cell neuroendocrine carcinoma and small cell carcinoma of the lung

Rira Hoshi; Yukitoshi Satoh; Masafumi Tsuzuku; Takeshi Horai; Yuichi Ishikawa

目的:肺大細胞神経内分泌癌 (LCNEC) と肺小細胞癌 (SCLC) の鑑別を目的とし, それらの細胞像を比較検討した.対象と方法:対象は摘出材料の組織学的検索にてLCNECと診断された22例とSCLC, intermediatetype (IMT) 20例. それらの経気管支針穿刺および摘出材料の捺印標本を用い, 細胞集塊, 細胞の出現様式, 細胞の大きさおよび性状について比較検討した.結果:LCNECは構成細胞数が60個以上の大型集塊での出現が目立ち, その集塊は辺縁の結合性が強く柵状配列がみられた. SCLCは散在性での出現が多く, 集塊で出現してもその結合性は弱かった. LCNECはSCLCと比較して, 細胞面積が120μm2で核小体の目立たない腫瘍細胞の出現率が低かった.結論:今回LCNECとSCLCとの鑑別点として, 出現形式, 集塊の構成細胞数集塊辺縁の結合性および配列, 核小体の目立たない小型腫瘍細胞の出現頻度が重要であることが示された. これらの細胞所見からLCNECとSCLCの細胞学的診断は可能であると考えられる.


The Journal of the Japanese Society of Clinical Cytology | 2003

A case of mucoepidermoid carcinoma of the uterine cervix

Ayako Nakajima; Kuniko Utsugi; Yaeko Kobayashi; Kazuya Tamura; Tetsuya Nakagawa; Yasutaka Kawamata; Atsuko Minami; Masafumi Tsuzuku; Katsuhiko Hasumi

背景:子宮頸部粘表皮癌は, 1997年版の子宮頸癌取扱規約では項目が削除され, 腺扁平上皮癌の範疇に含まれるまれな腫瘍である. 今回, 特徴的な子宮頸部粘表皮癌の細胞像を呈した1例を経験したので報告する.症例:54歳. 集団検診時に, 子宮頸部細胞診陽性のため, 近医を受診した. 子宮頸部細胞診はclass V (扁平上皮癌), 子宮頸部組織診で腺扁平上皮癌と診断され, 7月上旬に当院紹介受診となった. 診察所見で, 子宮頸部に長径20mmの腫瘍を認めたため, 精査治療目的で入院となった.1998年7月中旬, 当院に入院. MRI断層撮影で子宮頸部後唇に30×20×23mmの限局した腫瘍が認められた. 集塊を構成する細胞は, 細胞質がやや豊富で厚く扁平上皮様形態を示す細胞と細胞質内に粘液を有し核偏在性を呈する腺系細胞が混在して認められた. 子宮頸膣部の細胞診所見は, 血性背景の中に, 腫瘍細胞が平面的な小集塊として出現. 子宮頸癌Ib1期と診断され, 7月下旬に手術を施行した. 病理組織学的所見は, 非角化型扁平上皮癌の胞巣と粘表皮癌の胞巣があり, 両者の間の移行像が認められた. 粘表皮癌の胞巣部分では, 組織構築および癌細胞の細胞質は扁平上皮癌の性格を示し, それらに混じって細胞質内に粘液を豊富に含んだ癌細胞が認められた.結論:子宮頸部原発の粘表皮癌は, 腺扁平上皮癌の範疇に含まれるが, そのなかで, 他の腺扁平上皮癌に比較して, 細胞病理学的に特徴的な像を示し, かつ, 臨床的にリンパ節転移頻度が比較的高いために, 細胞診による病変推定が必要であると考えられた.


The Journal of the Japanese Society of Clinical Cytology | 2001

Presumptive histologic diagnosis of stage III or IV epithelial ovarian cancer by ascites cytology.

Tomoyasu Kato; Kahori Shimizu; Yuji Arai; Hideo Teshima; Satoshi Umezawa; Yoshio Shimizu; Masafumi Tsuzuku; Kazuhiro Yamauchi; Katsuhiko Hasumi

目的:III, IV期上皮性卵巣癌の腹水細胞診における各組織型に特徴的な集塊に注目し, 腹水細胞診による組織型推定の可能性を検討した.方法:1991年から1996年までに腹水細胞診を施行したIII, IV期卵巣癌91例のPapanicolaou染色標本を対象とした.成績:腹水細胞診陽性は67例 (74%) あり, 組織型別では漿液性腺癌が54例中44例 (82%), 明細胞腺癌が18例中14例 (78%), 粘液性腺癌が12例中7例 (58%), 類内膜腺癌が7例中2例 (29%) であった. 漿液性腺癌の特徴は100個以上の小型細胞から成る大型の乳頭状集塊で33例 (75%) にみられ, うち16例 (49%) はその集塊内に砂粒体を伴っていた. 明細胞腺癌では, 14例中10例 (71%) にmirror ball patternを示す集塊, 8例 (56%) に間質の石灰化を認めた. 粘液性腺癌ではシート状の集塊と細胞質内の粘液が全例にみられた. 類内膜腺癌の特徴は管腔状集塊であった. 上記の特徴的集塊の出現頻度は67例中52例 (78%) であった.結論:腹水細胞診はIII, IV期上皮性卵巣癌の組織型推定に有用と考えられた.


The Journal of the Japanese Society of Clinical Cytology | 2000

Comparative analysis of endometrial cytology between endometrial serous adenocarcinoma and ovarian or fallopian tubal serous adenocarcinoma.

Reiko Nemoto; Yuko Sugiyama; Yuji Arai; Yasuo Hirai; Wataru Sato; Shinichi Tate; Yoshiyuki Okano; Masafumi Tsuzuku; Katsuhiko Hasumi

目的: 子宮内膜細胞診において, 子宮体部の漿液性腺癌と卵巣, 卵管の漿液性腺癌の鑑別を目的に, 細胞学的検討を行った.方法: 1977年~1998年の21年間, 癌研究会附属病院にて手術を施行し, 確定診断された子宮体部漿液性腺癌32症例と, 子宮内膜細胞診陽性であった卵巣, 卵管原発の漿液性腺癌21症例を対象とした.子宮内膜細胞診はすべて増淵式吸引スメア法で採取した.結果: 細胞標本が見直し可能であった42例中, 子宮体部原発の26症例と, 卵巣, 卵管原発の16症例 (うち, 卵管癌7例) について細胞像を比較した.子宮体部漿液性腺癌では背景が腫瘍性 (92%) で, 正常子宮内膜細胞の混入は少なく, 腫瘍細胞集塊の辺縁が鋸歯状不整 (85%) な症例が多くみられた.一方, 卵巣, 卵管の漿液性腺癌では背景がきれい (81%) で, 正常子宮内膜細胞が多数混在しており, 腫瘍細胞集塊の辺縁が平滑 (94%) な症例が多くみられた.また, 腫瘍細胞集塊の構成細胞数は子宮体部漿液性腺癌では125.8±9.4個, 卵巣および卵管の漿液性腺癌では54.6±4.9個であり, 子宮体部漿液性腺癌の方が有意に多かった (t-test; p=0.000).結論: 子宮体部漿液性腺癌と卵巣, 卵管原発の漿液性腺癌は, 子宮内膜細胞診上個々の腫瘍細胞形態のみでは, 区別が困難であるが, 背景や集塊の出現形式, 正常子宮内膜細胞の混在に注目すると区別が可能と考えられた.


The Journal of the Japanese Society of Clinical Cytology | 1999

Cytologic features of adenoma malignum of the uterine cervix.

Yuji Arai; Atsuko Haga; Yasuo Hirai; Futoshi Akiyama; Masafumi Tsuzuku; Kazuhiro Yamauchi; Katsuhiko Hasumi

子宮頸部の悪性腺腫 (Adenomamalignum) における細胞像の診断的基準の確立を目的として検討を行った. 高分化型腺癌成分をほとんど含まない悪性腺腫8症例中再検討可能な5症例を対象とし,(1) 背景および出現部位,(2) 細胞集塊および配列,(3) 核および細胞質, の3項目について検討した. その結果,(1) 背景はきれいであったが黄色調の粘液がすべての部位に認められた.腫瘍細胞はC, Eスメアには認められたがVスメアにはほとんど認められなかった.(2) 大型シート状集塊, 全周性柵状配列を示す集塊, リボン状やぶどうの房状集塊などの出現を認めた.(3) 腫瘍細胞の細胞質には黄色調に染まる粘液を有していた. また核は類円形から楕円形で緊満感があり, クロマチンは微細顆粒状でeuchromatinの増加が示唆された.通常の鏡検時において1. きれいな背景に黄色調粘液の出現, 2. 黄色調粘液を有する丈の高い頸管腺細胞の集塊, 3-年齢 (高年齢) にそぐわない頸管腺細胞の出現とその量, 4. Cスメア標本に出現した頸管腺細胞の集塊, など4項目に示した所見のいずれかが認められた場合には, 上記の “悪性腺腫の特徴的細胞像” の (2),(3) と照らし合わせよく観察することにより診断可能であると思われた.


The Journal of the Japanese Society of Clinical Cytology | 1998

A case of cervical adnosoquamous carcinoma detected by peritoneal cytology at the operation.

Satoshi Umezawa; Atsuko Minami; Takayuki Ishiya; Yasuo Hirai; Hideo Teshima; Kazuhiro Yamauchi; Masafumi Tsuzuku; Katsuhiko Hasumi

子宮頸部扁平上皮癌の診断で化学療法後, 開腹手術時に行われた腹水細胞診で腺癌細胞を認めた1症例を経験したので報告する.症例は64歳女性で, 子宮頸部組織生検による治療前の診断は, 扁平上皮癌 (大細胞非角化型) であった.抗癌剤による化学療法後, 手術開腹時の腹水細胞診にて扁平上皮癌, 腺癌両方の悪性細胞を認めた.治療前のヘマトキシリン-エオジン染色 (H-E) 組織標本では, 腺管構造は認めなかった.しかし, PAS/Alcian-Blue染色を行った結果, 少数であるが陽性細胞を同定できた.この結果から本症例が, 組織学的には腺管構造のない粘液産生能を有する腺癌成分を有する腺扁平上皮癌であると考えられた.本症例は子宮頸部擦過細胞標本での腺癌成分の混在が推定され, 術中腹水細胞診では明らかな粘液産生細胞が同定された.組織標本では腺管構造をもたないが粘液産生能のある腺癌成分の診断に細胞診が有用と思われた.

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Katsuhiko Hasumi

Japanese Foundation for Cancer Research

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Noriyuki Furuta

Japanese Foundation for Cancer Research

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Atsuhiko Sakamoto

Tokyo Medical and Dental University

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Yukitoshi Satoh

Tokyo Medical and Dental University

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Fujimoto I

Japanese Foundation for Cancer Research

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Nobuhiro Takeshima

Japanese Foundation for Cancer Research

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Rira Hoshi

Japanese Foundation for Cancer Research

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Satoshi Umezawa

Japanese Foundation for Cancer Research

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