Brain metastasis
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Brain metastasis, also metastatic brain tumour, is a brain tumour that arose elsewhere and spread to the brain.
| Brain metastasis | |
|---|---|
| Diagnosis in short | |
 Metastatic adenocarcinoma, compatible with colorectal primary. HPS stain. | |
|
| |
| LM | usu. well-demarcated border between brain and lesion, no cytoplasmic processes (seen in glial tumours), usu. have nuclear atypia of malignancy, +/-glandular architecture, +/-nucleoli seen |
| LM DDx | primary brain tumour - see primary brain tumour versus secondary brain tumour |
| IHC | GFAP -ve, dependent on primary - typical +ve for keratins (as carcinoma) |
| Site | brain |
|
| |
| Prevalence | most common brain tumour (adults) |
| Radiology | intra-axial, typically grey-white junction, cerebellum (esp. in adults) |
| Prognosis | poor |
| Clin. DDx | primary brain tumour, cerebral abscess or infection |
| Treatment | surgery, chemotherapy, radiation therapy |
General
- Most common brain tumour in adults.[1][2]
- Common metastases (in order): lung, breast, kidney, gastrointestinal, melanoma.[3]
- Percentage of previously diagnosed cancers with brain metastases - by primary site: lung cancer 19.9%, melanoma 6.9%, breast cancer 5.1%, renal cancer 6.5%, colorectal cancer 1.8%.[4]
- Lung followed by kidney is the order in a smaller series.[5]
Gross/Radiology
- Intra-axial location.
- Typically at the grey-white junction.[6]
Image:
Microscopic
Appearance varies by subtype.
Features of metastatic carcinoma:
- Tubule formation/glands.
- Usually well-circumscribed/sharply demarcated from surrounding tissue.
- Usually nuclear atypia including:
- Nuclear hyperchromasia.
- Variation of nuclear size.
- Variation of nuclear shape.
- Mitoses - common.
DDx:
- Primary brain tumour - see primary brain tumour versus secondary brain tumour.
Images
CRC metastasis to cerebellum - very low mag. (WC)
CRC metastasis to the cerebellum - intermed. mag. (WC)
CRC metastasis to cerebellum - high mag. (WC)
Brain metastasis - high mag. (WC)
IHC
Main article: Immunohistochemistry
- Carcinoma: pankeratin +ve.
- Lung adenocarcinoma and SCLC: TTF-1 +ve, CK7 +ve, CK20 -ve.
- Breast carcinoma: CK7 +ve, ER +ve, PR +ve, BRST2 +ve/-ve.
- Colorectal carcinoma: CK7 -ve, CK20 +ve, CDX2 +ve, TTF-1 -ve.
- Clear cell renal cell carcinoma: PAX8 +ve, CK7 -ve, CK20 -ve, vimentin +ve, CD10 +ve.
- Melanoma: S-100 +ve, HMB-45 +ve, Melan A +ve.
- GFAP -ve.[7]
Other glial markers (suggest primary):[7]
- OLIG2, SOX2.
See also
References
- ↑ Pekmezci, M.; Perry, A. (2013). "Neuropathology of brain metastases.". Surg Neurol Int 4 (Suppl 4): S245-55. doi:10.4103/2152-7806.111302. PMID 23717796.
- ↑ Suki, D.; Khoury Abdulla, R.; Ding, M.; Khatua, S.; Sawaya, R. (Oct 2014). "Brain metastases in patients diagnosed with a solid primary cancer during childhood: experience from a single referral cancer center.". J Neurosurg Pediatr 14 (4): 372-85. doi:10.3171/2014.7.PEDS13318. PMID 25127097.
- ↑ Greenwald, J.; Heng, M. (2007). Toronto Notes for Medical Students 2007 (2007 ed.). The Toronto Notes Inc. for Medical Students Inc.. pp. NS9. ISBN 978-0968592878.
- ↑ Barnholtz-Sloan, JS.; Sloan, AE.; Davis, FG.; Vigneau, FD.; Lai, P.; Sawaya, RE. (Jul 2004). "Incidence proportions of brain metastases in patients diagnosed (1973 to 2001) in the Metropolitan Detroit Cancer Surveillance System.". J Clin Oncol 22 (14): 2865-72. doi:10.1200/JCO.2004.12.149. PMID 15254054.
- ↑ Schouten, LJ.; Rutten, J.; Huveneers, HA.; Twijnstra, A. (May 2002). "Incidence of brain metastases in a cohort of patients with carcinoma of the breast, colon, kidney, and lung and melanoma.". Cancer 94 (10): 2698-705. PMID 12173339.
- ↑ Della Puppa, A.; Dal Pos, S.; Zovato, S.; Orvieto, E.; Ciccarino, P.; Manara, R.; Zustovich, F.; Berti, F. et al. (Mar 2010). "Solitary intra-ventricular brain metastasis from a breast carcinoma.". J Neurooncol 97 (1): 123-6. doi:10.1007/s11060-009-9988-z. PMID 19727563.
- ↑ 7.0 7.1 7.2 Pekmezci, M.; Perry, A. (2013). "Neuropathology of brain metastases.". Surg Neurol Int 4 (Suppl 4): S245-55. doi:10.4103/2152-7806.111302. PMID 23717796.