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Placenta

Non-Trophoblastic Neoplasms

Chorangiomatosis

Reviewers: Mandolin Ziadie, M.D. (see Reviewers page)
Revised: 26 January 2013, last major update September 2011
Copyright: (c) 2003-2013, PathologyOutlines.com, Inc.

Definition
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● Non-expansile vascular proliferation similar to chorangioma but occurring in otherwise normal stem villi
● Associated with preeclampia, multiple gestation, premature delivery at 32 to 26 weeks (Hum Pathol 2000;31:945)
● Diffuse multifocal subtype asssociated with extreme prematurity (< 32 weeks), congenital malformations, intrauterine growth restriction, delayed villous maturation, avascular villi and placentomegaly

Micro description
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● Proliferation of small capillaries surrounded by a continuous layer of pericytes and stromal fibrosis
● Occurs within the stem villi and does not form a discrete mass
● Focal: involves <5 contiguous villi
● Segmental: involves >5 contiguous villi
● Diffuse / multifocal: involves several non-contiguous areas of the placenta

End of Placenta > Non-Trophoblastic Neoplasms > Chorangiomatosis

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