Huge pelvi-abdominal malignant inflammatory myofibroblastic tumor with rapid recurrence in a 14-year-old boy

Chia Hsun Lu, Hsuan Ying Huang, Han Koo Chen, Jiin Haur Chuang, Shu Hang Ng, Sheung Fat Ko

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Inflammatory myofibroblastic tumor (IMT) is an uncommon benign neoplasm with locally aggressive behavior but malignant change is rare. We report an unusual case of pelvic-abdominal inflammatory myofibroblastic tumor with malignant transformation in a 14-year-old boy presenting with abdominal pain and 9 kg body weight loss in one month. Computed tomography revealed a huge pelvi-abdominal mass (30 cm), possibly originating from the pelvic extraperitoneal space, protruding into the abdomen leading to upward displacement of the bowel loops, downward displacement of the urinary bladder, massive central necrosis, a well-enhanced peripheral solid component with prominent peritumoral vascularity. Subsequent examination confrmed the computed tomographic findings. Histopathologic examination revealed proliferative epitheloid and spindle cells, inflammatory cell infiltration and high mitotic counts. Immunohistochemistry was strongly positive for anaplastic lymphoma kinase and revealed a high proliferative index (ki-67 = 40%). DNA sequencing and electronic microscopy further confirmed the primitive fibroblastic cell phenotype of the tumor and a final diagnosis of inflammatory myofibroblastic tumor with malignant transformation was established. Rapid tumor recurrence was noted 20 d after radical tumor resection. To our knowledge, this is the largest documented case of IMT in a pediatric patient and the first report of IMT with malignant transformation originating from the pelvic extraperitoneal space.

Original languageEnglish
Pages (from-to)2698-2701
Number of pages4
JournalWorld Journal of Gastroenterology
Volume16
Issue number21
DOIs
Publication statusPublished - Jun 7 2010

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Recurrence
Neoplasms
DNA Sequence Analysis
Abdomen
Abdominal Pain
Weight Loss
Microscopy
Urinary Bladder
Necrosis
Immunohistochemistry
Tomography
Body Weight
Pediatrics
Phenotype

Keywords

  • Computed tomography
  • Extra-peritoneal space
  • Inflammatory myofibroblastic tumor
  • Malignant transformation
  • Pediatric patient
  • Pelvis

ASJC Scopus subject areas

  • Gastroenterology

Cite this

Huge pelvi-abdominal malignant inflammatory myofibroblastic tumor with rapid recurrence in a 14-year-old boy. / Lu, Chia Hsun; Huang, Hsuan Ying; Chen, Han Koo; Chuang, Jiin Haur; Ng, Shu Hang; Ko, Sheung Fat.

In: World Journal of Gastroenterology, Vol. 16, No. 21, 07.06.2010, p. 2698-2701.

Research output: Contribution to journalArticle

Lu, Chia Hsun ; Huang, Hsuan Ying ; Chen, Han Koo ; Chuang, Jiin Haur ; Ng, Shu Hang ; Ko, Sheung Fat. / Huge pelvi-abdominal malignant inflammatory myofibroblastic tumor with rapid recurrence in a 14-year-old boy. In: World Journal of Gastroenterology. 2010 ; Vol. 16, No. 21. pp. 2698-2701.
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