Malignant rhabdoid tumor: Difference between revisions

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*On microscopic histopathological analysis, malignant rhabdoid tumor is characterized by the round blue tumor cells of high cellularity composed of atypical cells with eccentric nuclei, small nucleoli, and abundant amounts of eosinophilic cytoplasm with frequent mitotic figures.
*On microscopic histopathological analysis, malignant rhabdoid tumor is characterized by the round blue tumor cells of high cellularity composed of atypical cells with eccentric nuclei, small nucleoli, and abundant amounts of eosinophilic cytoplasm with frequent mitotic figures.
*Malignant rhabdoid tumor is demonstrated by positivity to [[tumor markers]] such as [[vimentin]], EMA, AE1/AE3, and CAM5.2.<ref name=ihcmrt1>IHC of extrarenal malignant rhabdoid tumour. Libre Pathology 2015. http://librepathology.org/wiki/index.php/Malignant_rhabdoid_tumour. Accessed on December 23, 2015</ref>
*Malignant rhabdoid tumor is demonstrated by positivity to [[tumor markers]] such as [[vimentin]], EMA, AE1/AE3, and CAM5.2.<ref name=ihcmrt1>IHC of extrarenal malignant rhabdoid tumour. Libre Pathology 2015. http://librepathology.org/wiki/index.php/Malignant_rhabdoid_tumour. Accessed on December 23, 2015</ref>
*Renal malignant rhabdoid tumor must be differentiated from [[renal cell carcinoma]], [[Wilms' tumor]], mesonephric nephroma, and primitive neuroectodermal tumor of the kidney.
*Renal malignant rhabdoid tumor must be differentiated from [[renal cell carcinoma]], [[Wilms' tumor]], mesonephric nephroma, and primitive neuroectodermal tumor of the kidney.<ref name=renalmrt1>Differential diagnosis of malignant rhabdoid tumour of the kidney. Dr Matt A. Morgan and Radswiki et al. Radioaedia 2015. http://radiopaedia.org/articles/malignant-rhabdoid-tumour-of-the-kidney. Accessed on December 23, 2015</ref>
*Almost all reported cases of malignant rhabdoid tumor, regardless of site of origin, occur in young children between birth and 2 years of age.<ref name=epimalrt1>Epidemiology of rhabdoid tumours. Dr Ayush Goel and A.Prof Frank Gaillard et al. Radiopaedia 2015. http://radiopaedia.org/articles/rhabdoid-tumours. Accessed on December 22, 2015</ref>  
*Almost all reported cases of malignant rhabdoid tumor, regardless of site of origin, occur in young children between birth and 2 years of age.<ref name=epimalrt1>Epidemiology of rhabdoid tumours. Dr Ayush Goel and A.Prof Frank Gaillard et al. Radiopaedia 2015. http://radiopaedia.org/articles/rhabdoid-tumours. Accessed on December 22, 2015</ref>  
*In approximately 10% of cases of renal malignant rhabdoid tumor, the patients subsequently develop [[atypical teratoid rhabdoid tumor|intracranial atypical teratoid rhabdoid tumor]].
*In approximately 10% of cases of renal malignant rhabdoid tumor, the patients subsequently develop [[atypical teratoid rhabdoid tumor|intracranial atypical teratoid rhabdoid tumor]].

Revision as of 20:47, 23 December 2015

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Sujit Routray, M.D. [2]

Synonyms and keywords: Malignant rhabdoid tumour; Malignant rhabdoid neoplasm; Atypical teratoid rhabdoid tumor

Overview

  • Malignant rhabdoid tumor is one of the aggressive tumors in the pediatric population. It was originally described as a rhabdomyosarcomatoid variant of Wilms' tumor, which is primarily a renal tumor.[1]
  • Malignant rhabdoid tumor was first described as a variant of Wilms' tumor of the kidney, in 1978.
  • Malignant rhabdoid tumor is classified into two groups: renal and extrarenal.[2]
  • Malignant rhabdoid tumor is comprised of rhabdoid tumor cells and varying amounts of small undifferentiated primitive neuroectodermal tumor (PNET)-like, mesenchymally, and/or epithelially differentiated tumor cells.
  • Gene involved in the pathogenesis of malignant rhabdoid tumor include SMARCB1 (hSNF5/INI-1), a tumor suppressor gene.
  • Malignant rhabdoid tumor is characterized by loss of the long arm of chromosome 22, which results in loss of the hSNF5/INI-1 gene.
  • INI1, a member of the SWI/SNF chromatin remodeling complex, is important in maintenance of the mitotic spindle and cell cycle control.
  • Malignant rhabdoid tumor may be associated with rhabdoid predisposition syndrome.[3]
  • Common locations associated with malignant rhabdoid tumor include:[4]
  • On gross pathology, malignant rhabdoid tumor of the kidney is characterized by large, centrally located, heterogeneous soft-tissue masses involving the renal hilum with indistinct margins.[5]
  • On microscopic histopathological analysis, malignant rhabdoid tumor is characterized by the round blue tumor cells of high cellularity composed of atypical cells with eccentric nuclei, small nucleoli, and abundant amounts of eosinophilic cytoplasm with frequent mitotic figures.
  • Malignant rhabdoid tumor is demonstrated by positivity to tumor markers such as vimentin, EMA, AE1/AE3, and CAM5.2.[6]
  • Renal malignant rhabdoid tumor must be differentiated from renal cell carcinoma, Wilms' tumor, mesonephric nephroma, and primitive neuroectodermal tumor of the kidney.[7]
  • Almost all reported cases of malignant rhabdoid tumor, regardless of site of origin, occur in young children between birth and 2 years of age.[8]
  • In approximately 10% of cases of renal malignant rhabdoid tumor, the patients subsequently develop intracranial atypical teratoid rhabdoid tumor.
  • Common complication of malignant rhabdoid tumor include hypercalcemia, secondary to elevated parathyroid hormone levels.[9]
  • Prognosis is generally poor, with a reported mortality rate of patients with malignant rhabdoid tumor is 80 to 100%.[10]
  • Symptoms of malignant rhabdoid tumor of kidney include:[9]
  • CT scan may be diagnostic of malignant rhabdoid tumor. Findings on CT scan suggestive of malignant rhabdoid tumor include a large, heterogenous, centrally located mass, which is lobulated with individual lobules separated by intervening areas of decreased attenuation, relating to either previous hemorrhage or necrosis. Enhancement is similarly heterogeneous. Calcification is relatively common, observed in 20-50% of cases and is typically linear and tends to outline tumur lobules.[5]

References

  1. ↑ Malignant rhabdoid tumour. Wikipedia 2015. https://en.wikipedia.org/wiki/Malignant_rhabdoid_tumour. Accessed on December 22, 2015
  2. ↑ Malignant rhabdoid tumour. Libre Pathology 2015. http://librepathology.org/wiki/index.php/Malignant_rhabdoid_tumour. Accessed on December 23, 2015
  3. ↑ Genetics of malignant rhabdoid tumour. Wikipedia 2015. https://en.wikipedia.org/wiki/Malignant_rhabdoid_tumour. Accessed on December 22, 2015
  4. ↑ Rhabdoid tumours. Dr Ayush Goel and A.Prof Frank Gaillard et al. Radiopaedia 2015. http://radiopaedia.org/articles/rhabdoid-tumours. Accessed on December 22, 2015
  5. ↑ 5.0 5.1 Radiographic features of malignant rhabdoid tumor of the kidney. Dr Ayush Goel and A.Prof Frank Gaillard et al. Radiopaedia 2015. http://radiopaedia.org/articles/rhabdoid-tumours. Accessed on December 23, 2015
  6. ↑ IHC of extrarenal malignant rhabdoid tumour. Libre Pathology 2015. http://librepathology.org/wiki/index.php/Malignant_rhabdoid_tumour. Accessed on December 23, 2015
  7. ↑ Differential diagnosis of malignant rhabdoid tumour of the kidney. Dr Matt A. Morgan and Radswiki et al. Radioaedia 2015. http://radiopaedia.org/articles/malignant-rhabdoid-tumour-of-the-kidney. Accessed on December 23, 2015
  8. ↑ Epidemiology of rhabdoid tumours. Dr Ayush Goel and A.Prof Frank Gaillard et al. Radiopaedia 2015. http://radiopaedia.org/articles/rhabdoid-tumours. Accessed on December 22, 2015
  9. ↑ 9.0 9.1 Clinical presentation of malignant rhabdoid tumour of the kidney. Dr Matt A. Morgan and Radswiki et al. Radiopaedia 2015. http://radiopaedia.org/articles/malignant-rhabdoid-tumour-of-the-kidney. Accessed on December 23, 2015
  10. ↑ Madan, Karan; Bal, Amanjit; Agarwal, Ritesh; Das, Ashim (2014). "Malignant Extra Renal Rhabdoid Tumour Presenting as Central Airway Obstruction". Case Reports in Pulmonology. 2014: 1–4. doi:10.1155/2014/950869. ISSN 2090-6846.

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