CARCINOMA OF THE SKIN OF THE EYELID (ICD‐O‐3 C44.1)

Rules of Classification

There should be histological confirmation of the disease and division of cases by histological type – for example, basal cell, squamous cell, sebaceous carcinoma. Melanoma of the eyelid is classified with malignant melanoma of skin.

Regional Lymph Nodes

The regional lymph nodes are the preauricular, submandibular and cervical lymph nodes.

TNM Clinical Classification

T – Primary Tumour

T0	No evidence of primary tumour
Tis	Carcinoma in situ
T1	Tumour 10 mm or less in greatest dimension
	T1a	Not invading the tarsal plate or eyelid margin (Fig. 346)
	T1b	Invades tarsal plate or eyelid margin (Fig. 347)
	T1c	Involves full thickness of eyelid (Fig. 348)
T2	Tumour > 10 mm, but 20 mm or less in greatest dimension
	T2a	Not invading the tarsal plate or eyelid margin (Fig. 349)
	T2b	Invades the tarsal plate or eyelid margin (Fig. 350)
	T2c	Involves full thickness of eyelid (Fig. 351)
T3	Tumour > 20 mm, but more than 30 mm in greatest dimension
	T3a	Not invading the tarsal plate or eyelid margin (Fig. 352)
	T3b	Invades tarsal plate or eyelid margin (Fig. 353)
	T3c	Involves full thickness of eyelid (Fig. 354)
T4	Any eyelid tumour that invades adjacent ocular, orbital or facial structures
	T4a	Tumour invades ocular or intraorbital structures (Fig. 355a)
	T4b	Tumour invades (or erodes through) the bony walls of the orbit or extends to paranasal sinuses or invades the lacrimal sac/nasolacrimal duct or brain (Fig. 355b)

Schematic illustration of tumour 10 mm or less in greatest dimension not invading the tarsal plate or eyelid margin. — **Fig. 346**

Schematic illustration of tumour 10 mm or less in greatest dimension invades tarsal plate or eyelid margin. — **Fig. 347**

Schematic illustration of tumour 10 mm or less in greatest dimension involves full thickness of eyelid. — **Fig. 348**

Schematic illustration of tumour greater than or equal to 10 mm, but 20 mm or less in greatest dimension not invading the tarsal plate or eyelid margin. — **Fig. 349**

Schematic illustration of tumour greater than or equal to 10 mm, but 20 mm or less in greatest dimension invades the tarsal plate or eyelid margin. — **Fig. 350**

Schematic illustration of tumour greater than or equal to 10 mm, but 20 mm or less in greatest dimension involves full thickness of eyelid. — **Fig. 351**

Schematic illustration of tumour greater than or equal to 20 mm, but more than 30 mm in greatest dimension not invading the tarsal plate or eyelid margin. — **Fig. 352**

Schematic illustration of tumour greater than or equal to 20 mm, but more than 30 mm in greatest dimension invades tarsal plate or eyelid margin. — **Fig. 353**

Schematic illustration of tumour greater than or equal to 20 mm, but more than 30 mm in greatest dimension involves full thickness of eyelid. — **Fig. 354**

Schematic illustration of Any eyelid tumour that invades adjacent ocular, orbital or facial structures, tumour invades ocular or intraorbital structures, Tumour invades the bony walls of the orbit or extends to paranasal sinuses or invades the lacrimal sac or nasolacrimal duct or brain. — **Fig. 355**

N – Regional Lymph Nodes

NX	Regional lymph nodes cannot be assessed
N0	No evidence of lymph node involvement
N1	Metastasis in a single ipsilateral regional lymph node, 3 cm or less in greatest dimension (Fig. 356a)
N2	Metastasis in a single ipsilateral lymph node more than 3 cm in greatest dimension (Fig. 356b), or in bilateral or contralateral lymph nodes