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Image Number 330 (Smooth muscle hamartoma)


Diagnosis: Smooth muscle hamartoma

Site: Shoulder

Sex: M

Age: 19

Type: Clinical and Histology

Description: A large, circumscribed, soft, irregularly surfaced plaque over back of left shoulder

Submitted by: Irfan Bari

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Differential Diagnosis


Smooth-muscle hamartoma is an uncommon, usually congenital cutaneous hyperplasia of the arrectores pilorum muscles. When it is acquired, it may be confused with Becker's nevus. Here, I  report a case of this rare tumour in a young boy which started several years ago as multiple small skin coloured papules that subsequently coalesced to form a large soft plaque on back of shoulder and it never looked like Becker's nevus. Diagnosis was confirmed on histopatholgy and patient was managed conservatively.

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