Proliferating trichilemmal tumor (PTT) is a benign tumor originating from the hair follicle. Although it is a benign tumor, PTT may be locally aggressive and in very rare cases the tumor may become malignant. In most cases there is only one lesion and occur in elderly women.‎Summary · ‎Symptoms · ‎Learn More. Proliferating trichilemmal cyst (PTC), a rare benign tumor, is a fascinating follicular neoplasm. It occurs on head and neck region of elderly. SUMMARY: Proliferating trichilemmal cysts, also known as pilar tumors, are slow-growing lobulated masses most commonly found on the scalp of elderly women. Proliferating trichilemmal cysts usually result in large lobulated scalp masses. They are most often benign and can recur after incomplete excision.


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Sir, Proliferating trichilemmal tumor PTT is a well-circumscribed dermal or subcutaneous neoplasm with squamoid cytologic features and trichilemmal-type of keratinization.

Proliferating trichilemmal cyst - Wikipedia

Different terminologies have been used to describe this tumor, namely epidermoid cyst, pilar tumor of the scalp, proliferating trichilemmal cyst, proliferating epidermoid cyst, giant hair matrix tumor, hydatidi form keratinous cyst, trichochlamydocarcinoma, and proliferating trichilemmal cyst hair matrix tumor.

A year-old lady presented to the dermatology outpatient department with an itchy, red swelling over fronto-temporal part of the scalp for 1 year. Proliferating trichilemmal cyst was history of similar swelling over the same site 2 years back which she got excised from outside.

This time the swelling recurred and started as a pea-sized lesion and over the next months, it suddenly increased to attain the present size. The lesion often encroaches proliferating trichilemmal cyst the overlying epidermis which may be ulcerated.

Pathology Outlines - Pilar tumor

The individual cystic islands resemble regular trichilemmal cysts and often calcify figure 2. Indian J Dermatol ; Proliferating trichilemmal cyst is a rare benign tumor. Introduction Proliferating trichilemmal cyst PTCalso known as pilar tumor, is a rare benign proliferating trichilemmal cyst neoplasm with outer root sheath differentiation.

Different terminologies have been proliferating trichilemmal cyst to describe this tumor, pilar tumor of the scalp, PTC, giant hair matrix tumor, hydatidiform keratinous cyst, trichochlamydocarcinoma, and invasive hair matrix tumor.

Case Report A year-old female presented to skin outpatient department with complaint of a slowly growing mass on the scalp for the past 2 years [Figure 1].

The patient was otherwise healthy with no significant medical history. Ulceration and foul-smelling discharge may also occur. How proliferating trichilemmal cyst a proliferating trichilemmal cyst diagnosed?


Specific features on histology of a proliferating trichilemmal cyst allow the diagnosis to be made on skin biopsy. Ideally, the entire lesion should be excised for examination. Proliferating trichilemmal cyst staining techniques help to distinguish it from trichilemmal carcinoma.

Proliferating trichilemmal cyst should be differentiated from squamous cell carcinomadermoid cysts and cylindroma.