I am gastro resident Give IPCL pattern of esophagus with images

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IPCL pattern classification esophagus NBI endoscopy Inoue classification images

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https://www.e-ce.org/journal/view.php?doi=10.5946%2Fce.2021.…

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Excellent - I now have all the images and information needed. Here is the comprehensive IPCL pattern guide:

IPCL (Intraepithelial Papillary Capillary Loop) Pattern Classification - Esophagus

What is IPCL?

The IPCL is a capillary that arises from the fourth branch of the arborescent subepithelial vessels, forms single loops within the epithelial papillae, and is visible under magnifying NBI endoscopy (ME-NBI). In normal squamous epithelium, IPCLs are regular, small, and uniform. With progressive neoplastic transformation, they undergo stepwise morphological changes in four parameters:

D - T - C - V: Dilation | Tortuosity | Change in Caliber | Variation in shape

Classification Systems

Two main classifications are in use:

	Inoue (Original 2001)	JES Classification (2017)
Basis	5 types (I-VN)	2 types (A and B)
Clinical use	Japan, academic	Current international standard

Inoue IPCL Classification (Original)

Below is the full Inoue classification showing endoscopic images, schematics, pathological correlation, and treatment implication:

Inoue IPCL Classification with JES comparison - all types from I to VN with endoscopic images, schematics, and depth of invasion

From Bailey & Love's Short Practice of Surgery, 28th Ed., Fig. 66.45 - IPCL classification showing depth of invasion and treatment indication

Type-by-Type Breakdown (Inoue)

Type	Morphology	Histology / Depth	Treatment
Type I	Normal regular loops; small, uniform, hairpin shape	Normal squamous epithelium	None
Type II	Elongation + mild dilation	Esophagitis / reactive change	None / treat inflammation
Type III	Increased elongation, mild caliber change	Inflammation / Low-grade intraepithelial neoplasia (LGIN)	Observe / endoscopic treatment
Type IV	Increased caliber + elongation toward epithelial surface	Borderline HGIN / definite carcinoma	Endoscopic treatment
Type V-1	4 features: dilation + tortuosity + irregular caliber + non-uniformity (loop intact)	Carcinoma in situ (M1, EP)	EMR/ESD
Type V-2	V-1 features + elongation in vertical plane	M2 (lamina propria invasion, LPM)	EMR/ESD
Type V-3	Horizontal spread + loss of loop arrangement (destruction of IPCL)	M3/SM1 (muscularis mucosa/superficial submucosa)	ESD (relative indication); surgery if SM suspected
Type VN	Vessel diameter ~3x Type V-3; new tumor vessel formation	SM2 or deeper (deep submucosal)	Surgery

JES Classification (Japan Esophageal Society, 2017) - Current Standard

The JES classification simplifies Inoue into a more clinically actionable 2-tier system:

JES Classification (Type A, B1, B2, B3) with actual ME-NBI endoscopic images

JES Classification: Type A (normal), B1 (loop present), B2 (loop lost), B3 (highly dilated)

JES Type A - Normal/Benign

Normal IPCL OR abnormal microvessels without severe irregularity (3 or fewer morphological factors)
Vessel caliber: 7-10 µm
Corresponds to: Normal epithelium, inflammation, LGIN
No invasion

JES Type B - Abnormal (subdivided)

Morphological factors for "severe irregularity" = ALL 4 of: tortuosity + dilation + irregular caliber + various shapes

Subtype	Description	Caliber	Depth	Histology
B1	Abnormal microvessels with severe irregularity + loop-like formation preserved	~20 µm	T1a (EP or LPM) = M1/M2	HGIN, invasive SCC
B2	Type B vessels + loss of loop-like formation	Variable	T1a (MM) or T1b (SM1) = M3/SM1	Invasive SCC
B3	Highly dilated vessels; caliber >3x that of B2	>60 µm	T1b (SM2) or deeper	Invasive SCC

Clinical Endoscopic Images

Below are actual endoscopic images showing early squamous cell cancer detected with NBI:

Early squamous cell cancer: (a) White light with suspicious lesion marked, (b) NBI magnification showing abnormal IPCLs, (c) Lugol's iodine - unstained lesion

Fig. 66.44 from Bailey & Love's - (a) White light: suspicious lesion with white arrows; (b) NBI near-focus: abnormal IPCLs visible; (c) Lugol's chromoendoscopy: lesion unstained (iodine-negative)

Inoue + JES Correlation (Summary Diagram)

The comprehensive figure below shows both Inoue (original) and JES classifications side by side with endoscopic images, schematics, pathology, and treatment indication:

Comprehensive IPCL classification: Inoue (Types I-VN) and JES (A, B1-B3) with endoscopic images, schematics, depth of invasion, and histological correlation

(A) Inoue classification; (B) Arima classification; (C) JES classification with vessel calibers. Note: shaded oval = "formation of area" (loss of individual loop structure)

Key Points for Clinical Practice

1. When to use ME-NBI:

Any reddish or discolored flat lesion on white light
Lugol's iodine-negative (LCL) areas
Screening in high-risk patients (alcohol + smoking)

2. Treatment decision algorithm:

Type A / IPCL I-III  →  Observe or treat inflammation
IPCL IV / JES B1     →  EMR or ESD (curative)
JES B2 / IPCL V-3    →  ESD (if <2 cm) or surgery
JES B3 / IPCL V-N    →  Surgery ± neoadjuvant therapy

3. Four morphological factors to assess in every lesion (DTCV):

D - Dilation
T - Tortuosity
C - Caliber irregularity
V - Variation in shape (non-uniformity)

3 or fewer factors = JES Type A (benign/low-grade) All 4 factors = JES Type B (neoplastic) - then subclassify B1/B2/B3 by loop status and caliber

4. NBI technical note:

NBI uses 415 nm (blue) and 540 nm (green) wavelengths
These are absorbed preferentially by hemoglobin, enhancing visualization of superficial capillaries
Magnification (x80-115) is required for accurate IPCL assessment

Sources: Bailey & Love's Short Practice of Surgery 28th Ed. p.1158; Current Status of Image-Enhanced Endoscopy (2021); NBI classification review - QIMS

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