TABLE 1

Frequencies of sex and age of 550 consecutive mediastinal masses encountered in a 5-year period (2017–2021) at the National Hospital for Respiratory Diseases (Welisara, Sri Lanka)

	Subjects	Sex		Age (years)
	Subjects	Male	Female	Range	Mean±sd
Thymic lesions	171	100	71	12–83	49±17
Cyst	10	7	3	12–68	38±18
Hyperplasia	14	6	8	12–59	28±15
Thymolipoma	1	1	0	34	34
Thymoma	114	57	57	15–82	53±14
Thymic carcinoma (type C)	19	17	2	17–83	52±19
Carcinoid tumour	13	12	1	19–71	46±14
Lymphoma/leukaemia	100	45	55	11–75	33±13
Non-Hodgkin lymphoma	56	33	23	11–75	35±15
Hodgkin lymphoma	40	12	28	13–59	29±10
Unclassified	4	0	4	30–38	35±4
Infectious/inflammatory diseases	75	35	40	17–78	46±15
Tuberculosis	17	4	13	17–59	33±13
Sarcoidosis	35	17	18	17–74	50±12
Granulomatous inflammation unclassified	19	12	7	17–78	50±15
Rosai–Dorfman disease	2	0	2	17–33	25±11
Sinus histiocytosis	2	2	0	63–63	63±0
Germ-cell tumours	67	50	17	3–59	28±11
Seminoma	11	11	0	18–43	25±9
Teratoma	37	20	17	3–59	29±12
Malignant nonseminimatous tumours	19	19	0	5–53	27±12
Metastasis	58	38	20	20–75	56±11
Benign connective tissue tumours	34	18	16	1–72	47±20
Castleman disease	2	2	0	34–57	45±16
Lipoma	1	0	1	69	69
Angioma	3	2	1	25–71	52±24
Schwannoma	21	13	8	23–72	51±15
Neurofibroma	1	0	1	56	56
Ganglioneuroma	6	1	5	1–64	26±25
Developmental cysts	13	6	7	19–66	49±16
Bronchogenic	7	4	3	19–58	40±15
Pleuro-pericardial	2	1	1	42–64	53±16
Unclassified	4	1	3	59–66	63±3
Sarcoma	28	11	17	18–73	42±16
Other unclassified tumours	4	1	3	5–44	24±16

Data are presented as n, unless otherwise stated.