Towards a new paradigm of microscopic colitis: Incomplete and variant forms

Table 1 Key histological features of classical and incomplete subtypes of microscopic colitis[4,5,25]

Subtype	IELs/100 epithelial cells	Thickness of collagen band
LC	> 20 IELs	< 10 μm
LCi	> 10 and < 20 IELs	< 5 μm
CC	< 20 IELs (sometimes > 20 IELs)	> 10 μm
CCi	< 20 IELs	> 5 and < 10 μm

LC: Lymphocytic colitis; CC: Collagenous colitis; IELs: Intraepithelial lymphocytes cells; LCi: Incomplete lymphocytic colitis; CCi: Incomplete collagenous colitis.

Table 2 Incidence of incomplete microscopic colitis and paucicellular lymphocytic colitis

Ref.	Study period	Country	MCi subtype	Incidence
Fernández-Bañares et al[9]	2006-2009	Spain	Pacicellular LC	3.24 (2-4.48)
Bjornback et al[16]	1999-2010	Denmark	MCi	4 (NS)
Rasmussen et al[74]	2000-2014	Denmark	MCi	5 (NS)

Incidence per 100000 inhabitants and year. MCi: Incomplete microscopic colitis; Paucicellular LC: Paucicellular lymphocytic colitis; NS: Not specified.