Which feature most reliably distinguishes the nodular sclerosis subtype of classical Hodgkin lymphoma from the lymphocyte-rich subtype?

Question

Accepted Answer

D. Presence of fibrous bands and nodular fibrosis. ## Nodular Sclerosis vs. Lymphocyte-Rich cHL

### Histological Subtypes of Classical Hodgkin Lymphoma

Classical Hodgkin lymphoma is subdivided into four histological subtypes based on morphology and background composition:

| Subtype | Frequency | Key Feature | Background | Prognosis |
|---------|-----------|-------------|------------|----------|
| **Nodular Sclerosis** | 60–70% | **Fibrous bands, nodular fibrosis** | Mixed inflammatory | Good |
| **Lymphocyte-Rich** | 5% | Numerous small lymphocytes | Sparse Hodgkin/RS cells | Excellent |
| Mixed Cellularity | 15–25% | Numerous Hodgkin/RS cells | Mixed, no fibrosis | Intermediate |
| Lymphocyte-Depleted | <5% | Abundant Hodgkin/RS cells | Few lymphocytes | Poor |

### Nodular Sclerosis: Defining Architecture

**Key Point:** The nodular sclerosis subtype is defined by the presence of **fibrous bands and nodular fibrosis** that divide the lymph node into nodules. This architectural feature is pathognomonic and is the primary discriminator.

**High-Yield:** Nodular sclerosis accounts for 60–70% of all cHL cases and is the most common subtype. It typically presents with mediastinal involvement and supraclavicular lymphadenopathy.

### Lymphocyte-Rich Subtype: Defining Feature

**Clinical Pearl:** The lymphocyte-rich subtype is characterized by:
- Abundant small lymphocytes (>40% of cellularity)
- Sparse Hodgkin and Reed-Sternberg cells
- **Absence of fibrous bands and nodular fibrosis**
- Better prognosis than nodular sclerosis

### Why Fibrosis is the Discriminator

**Mnemonic:** **FIBROSIS = Nodular Sclerosis**
- **F**ibrous bands
- **I**ncomplete nodular division
- **B**ackground mixed inflammation
- **R**eed-Sternberg cells (variable)
- **O**ften mediastinal
- **S**taged higher at presentation
- **I**ntermediate prognosis
- **S**ubtype most common

The lymphocyte-rich subtype lacks this fibrotic architecture entirely.

### EBV Status: Not a Discriminator

**Warning:** EBV positivity varies across all cHL subtypes and is not a reliable discriminator between nodular sclerosis and lymphocyte-rich subtypes.

[cite:Robbins 10e Ch 13]

Answer

A. EBV positivity of neoplastic cells

Answer

B. Predominance of small lymphocytes in the background

Answer

C. Involvement of lower cervical and supraclavicular lymph nodes

Which feature most reliably distinguishes the nodular sclerosis subtype of classical Hodgkin lymphoma from the lymphocyte-rich subtype?

Explanation

Nodular Sclerosis vs. Lymphocyte-Rich cHL

Histological Subtypes of Classical Hodgkin Lymphoma

Nodular Sclerosis: Defining Architecture

Lymphocyte-Rich Subtype: Defining Feature

Why Fibrosis is the Discriminator

EBV Status: Not a Discriminator

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Subtype	Frequency	Key Feature	Background	Prognosis
Nodular Sclerosis	60–70%	Fibrous bands, nodular fibrosis	Mixed inflammatory	Good
Lymphocyte-Rich	5%	Numerous small lymphocytes	Sparse Hodgkin/RS cells	Excellent
Mixed Cellularity	15–25%	Numerous Hodgkin/RS cells	Mixed, no fibrosis	Intermediate
Lymphocyte-Depleted	<5%	Abundant Hodgkin/RS cells	Few lymphocytes	Poor