. they can be either pedunculated or sessile and are more common in the extremities . we present a case of 18 year female , who came with a swelling in right groin since 2 years which was diagnosed to be osteochondroma on x - ray and magnetic resonance imaging . excision biopsy was done as the patient wanted it to be removed for cosmetic purpose and confirmed it to be non - malignant osteochondroma . thus osteochondroma of the pelvis should be kept in mind as a differential diagnosis when evaluating mass in pelvis . . they can be either pedunculated or sessile and are more common in the extremities , i.e. distal femur , proximal tibia and proximal humerus in decreasing order . indications for excision are cosmetic deformity , pressure symptoms on neuro - vascular bundle or malignant transformation to chondrosarcoma which is rare . osteochondroma of the pubic ramus is rare entity and the actual incidence is not known . it can present as a solitary lesion or as a part of multiple hereditary exostosis . pelvic osteochondromas can present as compressive neuropathy or compressive symptoms on urethra , bladder or other vital structures and so on . on the contrary a pubic bone mass may need to be removed in young females which might be prominent at labia for cosmetic reasons as in our case . an 18 year female came to the out - patient department with complaints of swelling in right groin since 5 years which was insidious in onset , small in size initially but grew over last 5 years and was noticeable to the patient . , there was a bony hard swelling 3  5 cms in size in the groin at the pubic tubercle of the right side . plain x - ray s of pelvis ap , inlet and outlet view ( fig.1 to 3 ) and magnetic resonance imaging ( fig 4 & 5 ) showed bony growth of 543746 mm in size in transverse , craniocaudal and anteroposterior dimension which was arising from right superior pubic ramus and was extrapelvic in situation with a cartilage cap of 4 mm . 6 ) was taken and as the soft tissue was retracted cartilage cap of the osteochondroma was seen ( fig . manual palpation was done and one more piece was found which was then excised ( fig . 9 ) . inguinal ligament was closed in layers maintaining the external iliac ring with continuous sutures to prevent future inguinal hernia ( fig . osteochondromas are benign tumors which have an unknown etiology . it is considered as a developmental physeal abnormality rather than a primary bone neoplasm . a few theories have been suggested which include virchow theory , muller theory , keith theory , and a few more . the most common sites are metaphysis of long bones like distal femur , proximal tibia and proximal humerus . osteochondromas can also be found as a part of multiple hereditary exostosis which is thought to be associated with ext1 and ext 2 gene . osteochondromas are as such an incidental finding in patients and only a few are symptomatic . it is usually present in growing age and the growth of the mass stops after skeletal maturity . various studies have mentioned about the size of cartilage cap as a predictor for malignancy with a cartilage cap of more than 2 cm after skeletal maturity indicative of malignant transformation . pre operative investigations and planning in patients presenting with a bony neoplasm must be done . pre - operative x - rays and mri were done for our patient to see the extent and measure the cartilage cap of the osteochondroma . pelvic osteochondroma involving ilium has been reported in literature which caused nerve root compression and had to be removed . osteochondroma of the pubic symphisis has been reported which was removed due to bladder outlet obstruction . thus with a thorough search in literature we concluded that it is a rare entity and it was diagnosed due to the compressive symptoms caused by it . here in our case the swelling near the private part was the cause for the patient to seek medical help . there were no compressive symptoms either on vessels or on urinary tract which was confirmed by arterial doppler and micturating cysto - urethrography . a similar case was reported by qaisrani gh   and associates which was also present on superior pubic ramus and was removed for cosmetic deformity . complete en - bloc removal of the mass was done in our case for cosmetic reasons and she is being followed up regularly . even after 1 year there has not been any recurrence of the lesion . benign osteochondromas are usually incidental findings and are removed most commonly for cosmetic purposes with a very low incidence of recurrence if removed after skeletal maturity . also pelvic osteochondromas are rare entity but it has to be kept in mind for any bony mass when looking for differentials . pelvic osteochondromas are rare entity but it has to be kept in mind for any bony mass when looking for differentials .