Abstract
Histopathologic diagnosis of a subset of uterine smooth muscle tumors is challenging. We report a critical review regarding the clinicopathological point of view of 62 cases of subsequently recurred or metastasized leiomyoma. Medical records and glass slides of 62 cases of uterine smooth muscle tumor diagnosed as leiomyoma, which subsequently recurred or metastasized, were critically reviewed by pathologists specializing in gynecologic pathology and oncology. In 47 (75.8%) of 62 cases, the diagnosis of leiomyoma was confirmed, including 11 intravascular leiomyomatosis (IVL) and benign metastasizing leiomyoma (BML). In 29 cases (46.8%) laparoscopic surgery was performed, of which morcellator without a bag was employed in 23 cases. Fifteen cases (24.2%) appeared to be underestimated and were re-classified as smooth muscle tumor of uncertain malignant potential (STUMP), leiomyosarcoma, or other malignant mesenchymal tumors. Recurrences in seven cases (11.3%) were interpreted to be a malignant transformation, and one STUMP recurred as STUMP. The recurrence or metastasis in cases of "leiomyoma" is attributed to iatrogenic or under-evaluation of primary tumors, although a subset of cases is a rare example of biological progression.
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