Leather bottle appearance in stomach

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Leather Bottle Stomach (Linitis Plastica)

Definition

"Leather bottle" or linitis plastica is a descriptive gross/radiological term for a stomach whose wall has been diffusely infiltrated by tumour, producing a rigid, non-distensible, thickened structure that resembles a leather bottle or flask. The name comes from the Latin linum (linen/flax) and plastica (moulded).

Underlying Pathology - Diffuse Gastric Adenocarcinoma

The classic cause is the diffuse type of gastric adenocarcinoma (Lauren classification). Key features:

Feature	Detail
Growth pattern	Infiltrative - tumour permeates the entire gastric wall as small clusters and individual discohesive cells
Histology	Signet-ring cells - large mucin vacuoles push the nucleus to the periphery
Molecular basis	Loss of E-cadherin function (CDH1 mutations/methylation), causing cell discohesion
Desmoplastic reaction	Infiltrative cells trigger an intense fibrotic (scirrhous) stromal reaction that stiffens the wall
Gross result	Diffuse rugal flattening + rigid, thickened wall = leather bottle appearance

"When there are large areas of infiltration, diffuse rugal flattening and a rigid, thickened wall may impart a leather bottle appearance termed linitis plastica."

Robbins & Cotran Pathologic Basis of Disease

Gross Appearance

The image below (Panel B) shows the classic linitis plastica - the stomach wall is diffusely thickened, pale, and rigid with flattened, obliterated rugae, in contrast to Panel A (intestinal-type adenocarcinoma presenting as a bulky, ulcerated mass):

Gastric adenocarcinoma: intestinal type (A) vs. diffuse/linitis plastica type (B)

Fig. 17.20 - Robbins & Cotran: (A) Intestinal-type exophytic adenocarcinoma; (B) Diffuse-type infiltrative adenocarcinoma producing the leather bottle/linitis plastica appearance.

Radiological Features

On fluoroscopy (barium meal) - the preferred modality for appreciation:

Stomach appears narrowed, tubular, and rigid
Absent or markedly reduced peristalsis
Failure to distend with gas/contrast
Flattened or absent mucosal folds

On CT:

Diffuse circumferential wall thickening (>6 mm)
Loss of normal trilaminar architecture
Perigastric fat stranding may indicate T4 disease

"Linitis plastica is a descriptive term for diffuse scirrhous tumour, where the stomach appears as a narrowed, rigid structure (leather bottle stomach) and is better appreciated in fluoroscopic imaging compared with endoscopy."

Grainger & Allison's Diagnostic Radiology

Endoscopic Appearance

Endoscopy is often deceptively normal or subtle, because the tumour infiltrates submucosal/mural layers while sparing the mucosa initially. Features that may be seen:

Thickened, non-pliable folds
Poor distension even with air insufflation
Mucosal erosion in advanced cases
Biopsies may be falsely negative if superficial - deep/large biopsies or EUS-guided sampling may be needed

Other Causes of Linitis Plastica Pattern

While gastric adenocarcinoma is the most common cause, other conditions can mimic this appearance:

Cause	Notes
Gastric lymphoma	Can produce diffuse wall thickening
Metastatic disease	Especially breast lobular carcinoma (haematogenous submucosal deposition)
Amyloidosis	Luminal narrowing from amyloid deposition in the wall
Sarcoidosis / Crohn's disease	Rare causes of gastric wall fibrosis
Caustic ingestion	Post-inflammatory fibrosis

Clinical Features

Symptoms: Early satiety (dominant), weight loss, dyspepsia, dysphagia, nausea
Age: Mean ~40 years in familial CDH1 mutation carriers; older in sporadic cases
Sex: Similar M:F ratio (unlike intestinal type which is 2:1 M:F)
No geographic predilection - diffuse type is uniform worldwide (unlike intestinal type, which clusters in high-risk regions)
No identified precursor lesion - hence typically diagnosed late

Prognosis

Linitis plastica carries a poor prognosis. Because the diffuse infiltrative pattern does not form a discrete mass, diagnosis is often delayed. Depth of invasion and nodal/distant metastases are the strongest prognostic indicators. For advanced disease, 5-year survival is less than 20%; patients with germline CDH1 mutations are often offered prophylactic gastrectomy.

Sources: Robbins & Cotran Pathologic Basis of Disease (Fig. 17.20); Robbins & Kumar Basic Pathology; Grainger & Allison's Diagnostic Radiology (Advanced Gastric Cancer section).

Crohn disease

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Crohn Disease

Definition & Overview

Crohn disease is a chronic, relapsing, transmural inflammatory bowel disease that can involve any segment of the GI tract from the mouth to the anus, though it most commonly affects the terminal ileum, ileocecal valve, and cecum. Together with ulcerative colitis (UC), it forms the entity of inflammatory bowel disease (IBD).

Epidemiology

Most common in North America, northern Europe, and Australia; rising in Africa, Asia, and South America
Typically presents in adolescents and young adults (peak onset 15-30 years; second smaller peak 50-70 years)
3-5x more common in Ashkenazi Jewish populations
The hygiene hypothesis - reduced early-life microbial exposure may impair development of regulatory immune processes, predisposing to IBD
Incidence is rising globally, possibly related to processed food additives and changing gut microbiome

Pathogenesis

IBD (including Crohn disease) results from the combined effects of:

Genetic susceptibility - over 200 risk alleles identified, accounting for <20% of disease risk
- NOD2 (chromosome 16) - encodes an intracellular sensor for muramyl dipeptide (a bacterial cell wall component); the most strongly associated gene in European populations. Three major risk alleles present in ~30% of Crohn patients vs 5% of healthy individuals
- NOD2 risk alleles are rare in Asian populations - hence Crohn disease is less common there
- Other important genes: PTPN22, IL10, IL10RA, IL10RB (monogenic very-early-onset IBD)
- IBD risk alleles overlap with type 1 diabetes, ankylosing spondylitis, and psoriasis
Aberrant mucosal immune responses - dysregulated Th1/Th17 responses with excess TNF-α, IL-12, IL-23, and IFN-γ
Intestinal epithelial dysfunction - impaired barrier function allows microbial translocation
Gut microbiome dysbiosis - reduced Faecalibacterium prausnitzii is associated with disease recurrence

IBD pathogenesis diagram showing immune cell interactions, cytokine signaling, and gut microbiome involvement

Morphology

Distribution

Small intestine only: ~40% of cases
Small intestine + colon: ~30%
Colon only: ~30%
Can involve esophagus and stomach (infrequent)

Gross Pathology

Key gross features:

Feature	Description
Skip lesions	Multiple, sharply delineated involved segments separated by normal mucosa - the hallmark distinguishing Crohn from UC
Aphthous ulcers	Earliest lesion; progress to elongated serpentine ulcers along the long axis
Cobblestone mucosa	Ulceration with sparing of interspersed mucosa creates a cobblestone pattern
Fissures	Deep knife-like fissures that extend through the wall, forming abscesses or fistulas
Strictures	Wall thickening from edema, transmural inflammation, submucosal fibrosis, and muscularis propria hypertrophy
Creeping fat	Mesenteric adipose tissue wrapping over the serosal surface in areas of transmural disease
Thickened, rubbery wall	Palpably stiff bowel due to transmural inflammation and fibrosis

Microscopic Pathology

Transmural inflammation - the defining feature; lymphoid aggregates through all layers
Crypt abscesses - clusters of neutrophils within crypts, with crypt destruction
Crypt architectural distortion - haphazard branching crypts from repeated injury-regeneration cycles
Noncaseating granulomas (epithelioid, non-caseating) - pathognomonic when present; found in ~35% of cases only; can occur in any wall layer, mesenteric lymph nodes, or even skin. Absence does NOT exclude the diagnosis
Epithelial metaplasia - pseudopyloric (gastric antral-type) metaplasia; Paneth cell metaplasia in the left colon
Abrupt transition between ulcerated and normal mucosa

Crohn Disease vs. Ulcerative Colitis - Key Differences

Feature	Crohn Disease	Ulcerative Colitis
Bowel region	Ileum ± colon (any GI segment)	Colon only
Rectal involvement	Sometimes	Always (starts in rectum)
Distribution	Skip lesions	Diffuse, continuous
Inflammation	Transmural	Mucosa and submucosa only
Wall appearance	Thickened	Thin/normal
Ulcers	Deep, knife-like	Superficial, broad-based
Strictures	Common	Rare
Fistulas/sinuses	Yes	No
Granulomas	Yes (~35%)	No
Fibrosis	Marked	Mild to none
Serositis	Marked	Mild to none
Toxic megacolon	No	Yes
Perianal fistula	Yes (in colonic disease)	No
Fat/vitamin malabsorption	Yes (if small bowel involved)	No
Recurrence after surgery	Common	No (colectomy is curative)

Clinical Features

Typical presentation:

Intermittent attacks of crampy abdominal pain, low-grade fever, and diarrhea (often non-bloody)
~20% present acutely with right lower quadrant pain + fever, mimicking appendicitis
Bloody diarrhea when colon is involved
Relapsing-remitting course; triggers include physical/emotional stress, NSAIDs, smoking, specific foods

Complications:

Complication	Notes
Fibrosing strictures	Especially terminal ileum; leads to obstruction
Fistulas	Entero-enteric, enterovesical, enterovaginal, perianal, cutaneous
Abscesses	Peritoneal, intra-abdominal
Perianal disease	Fistulas and abscesses in ~20% of cases
Malabsorption	Hypoalbuminemia, iron deficiency anemia, vitamin B12 deficiency (terminal ileal disease)
Colorectal/small bowel adenocarcinoma	Increased risk with long-standing colonic Crohn disease
Recurrence after surgery	~40% require further resection within 10 years

Extraintestinal manifestations (may precede bowel symptoms):

Joints: Migratory polyarthritis, sacroiliitis, ankylosing spondylitis
Eyes: Uveitis, episcleritis
Skin: Erythema nodosum, pyoderma gangrenosum
Liver/bile ducts: Pericholangitis, primary sclerosing cholangitis (more common in UC)
Other: Clubbing of fingertips

Diagnosis

Colonoscopy + biopsy - gold standard; shows skip lesions, aphthous ulcers, cobblestone mucosa, fissures
CT/MRI enterography - evaluates extent, complications (abscesses, fistulas), comb sign (engorged peri-enteric vasculature in active disease)
Serology: ASCA (anti-Saccharomyces cerevisiae antibodies) positive in 60-70% of Crohn patients
Biomarkers: Elevated CRP, fecal calprotectin, fecal lactoferrin indicate active inflammation; CRP correlates with endoscopic activity
Disease Activity Index: Crohn's Disease Activity Index (CDAI); remission = CDAI <150; response = decrease ≥100 points

Treatment

Severity	Agents
Mild-moderate	Mesalazine (limited efficacy), budesonide (ileal/right-sided disease)
Moderate-severe	Systemic corticosteroids (short-term), azathioprine/6-mercaptopurine, methotrexate
Biologic therapy	Anti-TNF agents: infliximab, adalimumab, certolizumab pegol; Anti-integrins: vedolizumab; Anti-IL-12/23: ustekinumab
Refractory/complications	Surgery (resection of strictures, drainage of abscesses, repair of fistulas)

Surgery is not curative (unlike UC) - disease recurs at anastomotic sites; ~40% need repeat resection within 10 years
Mucosal healing (endoscopic remission + normal biomarkers) is now a key therapeutic target beyond symptom control

Sources: Robbins & Cotran Pathologic Basis of Disease (Figs. 17.35-17.38); Robbins & Kumar Basic Pathology (Figs. 13.28-13.29); Sleisenger and Fordtran's Gastrointestinal and Liver Disease

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