Ulceroprolifeative growth over lesser curvature for md pathology give

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Ulceroprolifeative growth over lesser curvature for md pathology give description and diagnosis

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MD Pathology Report: Ulceroproliferative Growth, Lesser Curvature of Stomach

Gross (Macroscopic) Correlate

An ulceroproliferative growth on the lesser curvature is the classic gross presentation of gastric carcinoma (Bormann Type III). Macroscopically this shows a raised, irregular ulcerated mass with everted/heaped-up edges, partially necrotic base, and surrounding mucosal destruction - combining both proliferative and ulcerative components.

Microscopic Description (based on your 5 slides, H&E stain)

All five images show a spindle cell proliferation with the following consistent features:

Slide-by-Slide Analysis

Slide	Key Finding
IMG_3270	Dense, sheet-like spindle cell proliferation; slit-like vascular channels; cells in intersecting fascicles
IMG_3271	Tissue fragments showing spindle cells with moderate eosinophilic cytoplasm; fibrous stroma; no glands
IMG_3272	Highly vascular stroma with spindle cell bundles; extravasated RBCs; slit-like vascular spaces dissecting stroma
IMG_3273	Spindle cells with moderate nuclear pleomorphism; hyperchromatic nuclei; extravasated hemorrhage; mild chronic inflammatory infiltrate
IMG_3274	Spindle cells with slit-like spaces; hemorrhagic stroma; collagenous background

Unified Microscopic Features

Cell Type:

Predominantly spindle-shaped (fusiform) cells with elongated, oval-to-cigar-shaped nuclei
Moderate pale-to-eosinophilic cytoplasm with indistinct cell borders
Mild-to-moderate nuclear pleomorphism; hyperchromatic nuclei
No definitive atypical mitoses visible at this magnification

Architecture:

Cells arranged in interlacing fascicles, sheets, and storiform/haphazard pattern
Slit-like, irregular vascular channels lined by the proliferating cells - the defining vasoformative pattern
No glandular, tubular, or acinar structures (no epithelial differentiation)

Stroma:

Abundant extravasated erythrocytes dissecting between spindle cells - prominent hemorrhage
Delicate collagenous fibrous background
Scattered chronic inflammatory cells (lymphocytes)

Negative Features:

No geographic coagulative necrosis
No signet ring cells
No true gland formation

Differential Diagnosis

Given the clinical context of an ulceroproliferative lesion on the lesser curvature of the stomach, combined with the histomorphology of spindle cells + slit-like vascular spaces + extravasated RBCs, the differential includes:

Diagnosis	For	Against
Gastric GIST (spindle cell type)	Spindle cells, storiform pattern, stomach location	Lesser curvature unusual; GISTs usually submucosal/exophytic; check CD117/CD34
Kaposi Sarcoma	Spindle cells + slit-like spaces + RBC extravasation - classic triad	Rare primary gastric KS; usually immunocompromised patient; check HHV-8
Gastric Leiomyosarcoma	Spindle cells, fascicular growth	Less vascular slit-like spaces; check desmin/SMA
Low-grade Angiosarcoma	Spindle cells, vasoformative channels, hemorrhage	More nuclear atypia expected; check CD31/CD34
Sarcomatoid Carcinoma	Ulceroproliferative lesion, stomach site	No epithelial component visible; check CK/EMA
Granulation tissue / Pyogenic granuloma	Vascular proliferation, inflammation	No true tumor architecture; not a mass

Most Likely Diagnosis

Gastric GIST (Gastrointestinal Stromal Tumor), spindle cell type OR Spindle cell neoplasm of stomach - Kaposi Sarcoma pattern (vasoformative)

The histomorphology is most consistent with a vasoformative spindle cell neoplasm. The classic triad seen across all 5 slides - proliferating spindle cells + slit-like vascular channels + abundant extravasated red blood cells - is the textbook pattern of Kaposi Sarcoma (plaque/nodular stage). However, given the clinical presentation of an ulceroproliferative mass on the lesser curvature, gastric GIST (spindle cell type) is also a strong possibility.

Recommended IHC Panel to Confirm

Marker	Purpose
CD117 (c-KIT)	Positive in >95% GIST
CD34	Positive in GIST; also KS
DOG1	Highly specific for GIST
HHV-8 (LANA-1)	Positive in Kaposi Sarcoma
CD31, ERG	Pan-endothelial; supports vascular tumors
SMA, Desmin	For leiomyosarcoma exclusion
CK (AE1/AE3)	For sarcomatoid carcinoma exclusion
S-100	For nerve sheath tumors

Note for MD Viva / Exam

For a lesser curvature ulceroproliferative lesion in standard MD pathology context, if the question expects an adenocarcinoma scenario, the classical answer would be:

Diagnosis: Gastric adenocarcinoma (intestinal type, moderately differentiated)
Bormann Type III macroscopy
Lauren classification: Intestinal type (tubular/glandular pattern) vs. Diffuse type (signet ring cells)
Most common site: Lesser curvature, antro-pyloric region

However, the slides provided do NOT show glandular formation or signet ring cells - they show a pure spindle cell vasoformative lesion, which points to GIST or Kaposi Sarcoma rather than adenocarcinoma.

If this is an examination slide set provided with the "ulceroproliferative lesser curvature" context, the expected diagnosis with these histological features is:

Gastric GIST, spindle cell type - confirmed by CD117/DOG1 positivity on IHC

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