peripolesis

per·i·po·le·sis

(per'i-pō-lē'sis),
Penetration of migrating cells between fixed tissue cells that are normally in close contact.
[peri- + G. poleomai, to wander]

peripolesis

(pĕr″ĭ-pō-lē′sĭs) [Gr., a going about]
In tissue culture, the collecting of lymphocytes around macrophages.