Pheochromocytoma: Difference between revisions
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'''Pheochromocytoma''' is a tumour of the [[adrenal gland]] medulla. It may be benign | '''Pheochromocytoma''' is a tumour of the [[adrenal gland]] medulla. It may be benign or malignant. | ||
==General== | ==General== | ||
Revision as of 02:49, 23 August 2014
Pheochromocytoma is a tumour of the adrenal gland medulla. It may be benign or malignant.
General
- Considered to be a paraganglioma.[1]
- Literally means "dusky" (pheo) "colour" (chromo) - dull appearance on gross.
- Tumour arises from adrenal medulla - chromaffin cells.[2]
Memory device - the rule of 10s:[2]
- 10% extra-adrenal (e.g. carotid body, organ of Zuckerkandl (neighourhood of aortic bifuration/IMA branch point)).
- 10% bilateral.
- 10% malignant.
- 10% no hypertension.
- 25% associated within a syndrome:
- Multiple endocrine neoplasia 2A and 2B.
- von Hippel-Lindau syndrome.
- Neurofibromatosis type 1.
- Familial paraganglioma syndromes - several.
Clinical
- Classic finding: hypertension.
- Paroxysms (i.e. episodes) of tachycardia, headache, anxiety, hypertension.
Laboratory findings (urine):
- Vanillylmandelic acid (VMA).
- Metanephrines.
Microscopic
Features:[3]
- Chief cells:
- Usu. polygonal cells, may be spindled.
- Arranged in cell nests - "Zellballen" (literally cell balls) - key feature.
- Stippled chromatin (AKA salt and pepper chromatin) - coarsely granular chromatin.
- Granular cytoplasm, often basophilic - important.
- Sustentacular cells (structural support cell).
- Often haemorrhagic - highly vascular.
- +/-Nuclear pleomorphism.
Notes:
- The nested architecture (Zellballen) is useful for differentiating from ACC.
- Metastasis sole criteria of malignancy.[2]
- Surrounding adrenal cortex is typically compressed.[4]
DDx:
Images
-
Carotid body tumour - low mag. (WC/Nephron) -
Carotid body tumour - high mag. (WC/Nephron)
Pheochromocytoma versus adrenal cortical carcinoma
- Pheochromocytoma and adrenal cortical carcinoma overlap histologically.[5]
Favour pheochromocytoma:
- Small chickenwire-pattern blood vessels, nests, salt-and-pepper chromatin, red blood cell extravasation.
Favour adrenal cortical carcinoma:
- Nucleolus, sheeting.
Malignant pheochromoctyoma
- Robbins says metastases are the sole criteria of malignancy.[2]
- Thompson suggests one can differentiate benign from malignant with the aid of the following:[6]
- Marked nuclear atypia.
- Invasion:
- Capsular.
- Vascular.
- Necrosis.
- Cellular monotony.
- Mitoses:
- Rate.
- Atypical mitosis.
IHC
- Chief cells:
- Chromogranin A +ve.
- Synaptophysin +ve.
- Sustentacular cells:
- S100 +ve.
Electron microscopy
- Membrane-bound secretory granules.
Sign out
ADRENAL MASS, RIGHT, ADRENALECTOMY: - PHEOCHROMOCYTOMA. - SURGICAL MARGIN NEGATIVE FOR PHEOCHROMOCYTOMA. COMMENT: The tumour cells stains for chromogranin and synaptophysin. S-100 marks the sustentacular cells. Inhibin is negative in the tumour cells. The immunostaining pattern is consistent with a pheochromocytoma.
Micro
The sections shows a partially hemorrhagic lesion in the medulla of the adrenal gland that is arranged in nests (Zellballen). The tumour cells have abundant grey/blue granular cytoplasm, and nuclei with granular chromatin (salt and pepper chromatin). The lesion is surrounded by a compressed rim of adrenal cortex and fibrosis tissue. The core of the lesion is fibrotic and has clusters of hemosiderin-laden macrophages.
There is no capsular invasion. Vascular invasion is not identified. There is no necrosis. Mitotic activity is not appreciated.
The adrenal cortex is unremarkable.
See also
References
- ↑ Thompson, Lester D. R. (2006). Endocrine Pathology: A Volume in Foundations in Diagnostic Pathology Series (1st ed.). Churchill Livingstone. pp. 327. ISBN 978-0443066856.
- ↑ 2.0 2.1 2.2 2.3 Mitchell, Richard; Kumar, Vinay; Fausto, Nelson; Abbas, Abul K.; Aster, Jon (2011). Pocket Companion to Robbins & Cotran Pathologic Basis of Disease (8th ed.). Elsevier Saunders. pp. 586. ISBN 978-1416054542.
- ↑ Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1161. ISBN 978-1416031215.
- ↑ URL: http://www.pathpedia.com/Education/eAtlas/Histopathology/Adrenal/Pheochromocytoma.aspx. Accessed on: 27 May 2013.
- ↑ Sangoi, AR.; McKenney, JK. (Mar 2010). "A tissue microarray-based comparative analysis of novel and traditional immunohistochemical markers in the distinction between adrenal cortical lesions and pheochromocytoma.". Am J Surg Pathol 34 (3): 423-32. doi:10.1097/PAS.0b013e3181cfb506. PMID 20154585.
- ↑ Thompson, Lester D. R. (2006). Endocrine Pathology: A Volume in Foundations in Diagnostic Pathology Series (1st ed.). Churchill Livingstone. pp. 259. ISBN 978-0443066856.