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is a significant concern for physicians. Central7 M) ^; }& R" ]' A" g, B; j7 _$ ~
precocious puberty (CPP), which is mediated
! `0 `. e! \8 I+ Q1 W ^through the hypothalamic pituitary gonadal axis, has
' m' g6 E9 C, I: E( d2 Ba higher incidence of organic central nervous system
_/ `$ p o llesions in boys.1,2 Virilization in boys, as manifested
0 f6 U) c! E% r/ y2 z. Uby enlargement of the penis, development of pubic
& L* e! g0 z. U' E9 qhair, and facial acne without enlargement of testi-# K( ^% [$ o5 H6 F. z8 j' X4 y
cles, suggests peripheral or pseudopuberty.1-3 We U. Z& t% }# [9 Q. m3 F2 ^4 m
report a 16-month-old boy who presented with the/ W- P5 \, b. r- O* C( R9 R3 {& p8 \
enlargement of the phallus and pubic hair develop- {: e" W' e: o5 y6 S, b! M
ment without testicular enlargement, which was due# V Q. {( m/ X8 m+ ?* Z
to the unintentional exposure to androgen gel used by" G. j) X# d: W$ w+ u, k" g2 D* S& ^
the father. The family initially concealed this infor-
& [, |1 c+ V9 |4 G5 i8 n- Mmation, resulting in an extensive work-up for this& q9 \# I( _2 J+ |1 f8 p
child. Given the widespread and easy availability of
6 D a ?6 h9 Z: V8 ^& o1 Wtestosterone gel and cream, we believe this is proba-
4 k: [& m& e3 D' Z# b/ Ibly more common than the rare case report in the+ p" V* J9 f6 ^; ?
literature.4
- j+ \1 q" [' s8 X& { OPatient Report" A6 t6 q- u$ i
A 16-month-old white child was referred to the
: {) l9 L; {1 A) l- `6 y1 Gendocrine clinic by his pediatrician with the concern" e$ t% y( u% [: g
of early sexual development. His mother noticed
5 V4 A' E5 u$ g% c# k' g+ e* Qlight colored pubic hair development when he was
- m3 ^3 G3 S4 bFrom the 1Division of Pediatric Endocrinology, 2University of
8 A8 G, |* h4 u, \& M3 b8 {% uSouth Alabama Medical Center, Mobile, Alabama.
% J2 q5 ?% X d. z. HAddress correspondence to: Samar K. Bhowmick, MD, FACE,
w9 `; ]. ^1 B) H. K2 BProfessor of Pediatrics, University of South Alabama, College of. m6 @( t& y" L
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;7 {: p" S7 Q0 |* P/ d
e-mail: [email protected].: l& B9 L' T- T. E( A9 f
about 6 to 7 months old, which progressively became5 O8 i s/ b8 G: f% a1 X
darker. She was also concerned about the enlarge-
0 q+ U' F8 ]' X i" ument of his penis and frequent erections. The child
% i9 I+ Y5 x4 `5 \7 w3 n, k. swas the product of a full-term normal delivery, with
- ^5 Y$ {& n( @% ya birth weight of 7 lb 14 oz, and birth length of
# m7 ^8 o+ l% k# g' P( y+ x7 t3 A L20 inches. He was breast-fed throughout the first year
. i! l; ^2 Y# p4 b- p/ Uof life and was still receiving breast milk along with4 o$ k: ?0 V# | S: g
solid food. He had no hospitalizations or surgery,
' p& I9 a- @6 L/ O# i- ]and his psychosocial and psychomotor development! n! i8 K+ J, ^) c1 w: w* J
was age appropriate.' R s/ C4 f6 V' s+ o% L! x
The family history was remarkable for the father,
1 [" s% y5 E$ l- u* kwho was diagnosed with hypothyroidism at age 16,1 N, |) t7 T: r! w# Z
which was treated with thyroxine. The father’s8 x9 @* l% z& C7 f: O+ {8 N
height was 6 feet, and he went through a somewhat$ ?, s$ h! I2 x8 x$ a Q7 X) K' G
early puberty and had stopped growing by age 14.% j6 e, e) s# R/ \- y5 E
The father denied taking any other medication. The o" {1 U8 b E. O! `: s( M) ~1 ? e4 v
child’s mother was in good health. Her menarche
' A) y. m& q: t$ n* Y5 lwas at 11 years of age, and her height was at 5 feet1 I' O, Q6 |& u! a" a; {: T
5 inches. There was no other family history of pre-- m$ J$ W7 P1 r5 L' `5 Q/ F
cocious sexual development in the first-degree rela-
& K& U# S/ } X Btives. There were no siblings.
) s4 Q$ _+ B# Y. DPhysical Examination7 H5 M$ E2 A' n: i# F& p6 Z
The physical examination revealed a very active,
, o! s& B6 g' u! ~ Q8 c9 r, a/ [playful, and healthy boy. The vital signs documented5 ~ j3 @; m8 e1 g
a blood pressure of 85/50 mm Hg, his length was/ \, r: E) O! S$ E6 [
90 cm (>97th percentile), and his weight was 14.4 kg B' M5 W" J U, t
(also >97th percentile). The observed yearly growth
0 v z0 ^* z" r+ k9 R/ I/ bvelocity was 30 cm (12 inches). The examination of+ G8 k1 o+ b( s, O1 n' I/ {" c
the neck revealed no thyroid enlargement.& D4 `0 N8 y: j+ j1 l
The genitourinary examination was remarkable for4 J- j X6 z3 g" K- [
enlargement of the penis, with a stretched length of N4 z) r A/ y/ t# t" a
8 cm and a width of 2 cm. The glans penis was very well
# L, |) H3 R G- Z) h7 {developed. The pubic hair was Tanner II, mostly around! `, E% F1 U. h2 j; K' y
540) b' M2 |2 B5 S
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
( G. k' u* }! C. u9 [' Q* ~, Athe base of the phallus and was dark and curled. The
# ]0 z) J- b# G' \, ^ Rtesticular volume was prepubertal at 2 mL each.
" w% ~( w% E. l- K7 P2 L; V3 G0 kThe skin was moist and smooth and somewhat# `' C/ ?$ S1 ~" Z
oily. No axillary hair was noted. There were no. f) n0 n) y3 k! ] J/ b) g! Q
abnormal skin pigmentations or café-au-lait spots. T+ K9 w, a( r) y# U- B- t) i
Neurologic evaluation showed deep tendon reflex 2+. T; A ?: P, L+ p/ c, Y, g
bilateral and symmetrical. There was no suggestion. F0 X3 t. F: L7 |% d; Z6 B
of papilledema.
. m& x8 B2 e' _. o/ l l- P1 SLaboratory Evaluation" J0 k+ v7 l% @% I+ y
The bone age was consistent with 28 months by
& @8 O B G @. N) xusing the standard of Greulich and Pyle at a chrono-
' z$ C+ v) m. wlogic age of 16 months (advanced).5 Chromosomal8 g3 L0 ^2 j( L2 o
karyotype was 46XY. The thyroid function test
% c. i' t2 x% e9 k" Ashowed a free T4 of 1.69 ng/dL, and thyroid stimu-
" e3 A y1 w7 o, F9 ilating hormone level was 1.3 µIU/mL (both normal).- o7 M2 Y; n8 W
The concentrations of serum electrolytes, blood
' X1 P- d9 J- q7 Y' uurea nitrogen, creatinine, and calcium all were
) m8 h; u6 Z1 O1 B/ K# U0 Q: Nwithin normal range for his age. The concentration/ M3 G! _1 s$ a/ m" V% k- a! _
of serum 17-hydroxyprogesterone was 16 ng/dL3 Q$ [7 S; w5 v) q4 I
(normal, 3 to 90 ng/dL), androstenedione was 20
0 S0 |: y( e9 H) A$ w( Ang/dL (normal, 18 to 80 ng/dL), dehydroepiandros-- J! E/ o/ L3 Y! o2 i6 b
terone was 38 ng/dL (normal, 50 to 760 ng/dL),1 } t. U/ F7 o n8 a
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
: a& r" _- ~" `# z) h* C49ng/dL), 11-desoxycortisol (specific compound S)* C! P5 Y! m9 p# d2 c+ u( B
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-6 K6 l3 r; A+ v: ?7 m
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total" p* P) ?. E, z8 [( T, ]/ N }3 [4 M
testosterone was 60 ng/dL (normal <3 to 10 ng/dL), k/ ^* Z: z( r. x q7 t! b
and β-human chorionic gonadotropin was less than
/ } l1 S/ b# y1 s5 mIU/mL (normal <5 mIU/mL). Serum follicular* W& n S {: U2 l5 P
stimulating hormone and leuteinizing hormone
0 d& W5 X* p3 U' Gconcentrations were less than 0.05 mIU/mL
2 w! g B/ `+ w& r8 }(prepubertal).6 j9 D( x# j. L* i1 x( l& r1 F/ t
The parents were notified about the laboratory: R) x1 w" c% w+ Z1 R9 R- H
results and were informed that all of the tests were" s% P! c6 ^% z7 {
normal except the testosterone level was high. The9 l- c9 Z, M5 L
follow-up visit was arranged within a few weeks to# Q: @' B+ K5 E+ B8 s& Z* c9 _) j
obtain testicular and abdominal sonograms; how-
* ?3 R9 Y W" m) u9 _, }ever, the family did not return for 4 months.$ w2 s3 @- ]8 I% V
Physical examination at this time revealed that the- c6 W B8 ~" X+ o9 o% c
child had grown 2.5 cm in 4 months and had gained
. y$ n0 H" r9 ^/ {2 kg of weight. Physical examination remained
0 p" F+ g9 c6 bunchanged. Surprisingly, the pubic hair almost com-) I9 t0 I, G9 X( E
pletely disappeared except for a few vellous hairs at
+ L( ]* q0 D- U) Cthe base of the phallus. Testicular volume was still 2, i' r0 U, T {- F7 @: S
mL, and the size of the penis remained unchanged.
6 q! a; k/ X$ F$ p7 GThe mother also said that the boy was no longer hav- W* j6 m( I% i n2 n O
ing frequent erections.
1 {4 F4 D6 V% r) s6 \Both parents were again questioned about use of
2 e# Z) H4 m0 u6 i6 A/ s; U1 dany ointment/creams that they may have applied to/ ^, L/ ?3 c }+ u; P; T1 b J' N2 I
the child’s skin. This time the father admitted the) g, j1 P2 `, n
Topical Testosterone Exposure / Bhowmick et al 5411 @6 L: }* ~+ ], u4 T3 [
use of testosterone gel twice daily that he was apply-9 G2 s/ R- H6 z4 h. G5 S# f' M4 ?) X
ing over his own shoulders, chest, and back area for* ]) h" p6 U$ [. q- m5 K0 z
a year. The father also revealed he was embarrassed
1 a3 f$ [' x- {to disclose that he was using a testosterone gel pre-
$ C. g9 u0 |( ^$ T0 N* Iscribed by his family physician for decreased libido4 y' u/ g: P" }7 ]
secondary to depression.
! }: g) s5 u! N0 J: k2 [ SThe child slept in the same bed with parents.
{) {4 O# h( O+ l9 J- Y* e' jThe father would hug the baby and hold him on his. [. f8 P% T9 @4 O6 d8 H4 X- ~
chest for a considerable period of time, causing sig-
. D; m, l9 n2 k. O( Inificant bare skin contact between baby and father.4 l8 Y, H) }; j$ E/ i8 e% q
The father also admitted that after the phone call,! d4 r; W" p F# A0 h3 N' ] [
when he learned the testosterone level in the baby: D0 w7 U0 X/ I
was high, he then read the product information! V! h- H& y2 E9 \9 p6 T7 ?& J
packet and concluded that it was most likely the rea-& p! N& U! L# Q8 x& x0 A
son for the child’s virilization. At that time, they
0 o5 q6 p. m5 m3 P1 a. _decided to put the baby in a separate bed, and the4 W5 C, {) C$ U( M9 ~) ^
father was not hugging him with bare skin and had+ R* @$ T8 G' b, z0 A# `
been using protective clothing. A repeat testosterone
+ X1 l3 ]% R* atest was ordered, but the family did not go to the
& E4 [" r0 C$ U4 Alaboratory to obtain the test.% Z9 A+ a$ e8 O" ~+ `; `
Discussion* p7 v9 I3 C, B
Precocious puberty in boys is defined as secondary
' C+ P( P$ c. p: t ~7 M& Esexual development before 9 years of age.1,4
) H9 y( r/ D6 V7 M1 s, L$ F0 BPrecocious puberty is termed as central (true) when0 T4 N8 P& O# _: y/ N
it is caused by the premature activation of hypo-
0 S$ ?% _! L. U) o5 \thalamic pituitary gonadal axis. CPP is more com- T6 e0 O9 \' R) |) V$ f* V9 B6 i4 P
mon in girls than in boys.1,3 Most boys with CPP4 N, `6 L/ w$ q1 K: h
may have a central nervous system lesion that is" X7 h) ^, h8 y
responsible for the early activation of the hypothal-
2 D0 U- p7 W7 }5 kamic pituitary gonadal axis.1-3 Thus, greater empha-7 |0 v: B: P: _) m. y
sis has been given to neuroradiologic imaging in
9 _* f; V$ h3 hboys with precocious puberty. In addition to viril-' u# ?: k$ J. _8 W
ization, the clinical hallmark of CPP is the symmet-
/ {8 }# G- }, d S! mrical testicular growth secondary to stimulation by- x# y9 V0 Z8 g0 Y$ } J
gonadotropins.1,3 O' M( C- G! j @
Gonadotropin-independent peripheral preco-
! C, N' j- P/ Mcious puberty in boys also results from inappropriate
7 F; Z1 U/ ?- D( Uandrogenic stimulation from either endogenous or
+ j! O$ u! ^% _/ Qexogenous sources, nonpituitary gonadotropin stim-
. M( K2 r6 b# A3 Zulation, and rare activating mutations.3 Virilizing3 y O6 i9 j |% k6 e
congenital adrenal hyperplasia producing excessive
7 B5 ^" u) ^( ?% W+ p7 w" |adrenal androgens is a common cause of precocious- Z5 N7 i( t- {6 f7 M
puberty in boys.3,4
3 a- z! n. |3 h# sThe most common form of congenital adrenal- }" N4 h, w a2 q
hyperplasia is the 21-hydroxylase enzyme deficiency.
( w r( n, I9 @The 11-β hydroxylase deficiency may also result in
9 a% s, E8 ?# I* ^3 ?+ uexcessive adrenal androgen production, and rarely,2 V0 }( e/ d" k9 Y! j/ c' A
an adrenal tumor may also cause adrenal androgen
* D! g5 z* h. ?' [5 w4 h/ Y' W7 Iexcess.1,30 {8 O% C- W; k+ m- y
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
! v; k/ R1 y$ T$ E$ q542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
" c3 Y, n/ w& F" B! t7 z# O3 jA unique entity of male-limited gonadotropin-
9 e4 P5 t8 J; L& j4 C5 hindependent precocious puberty, which is also known7 k& a) C' W B7 x/ ?
as testotoxicosis, may cause precocious puberty at a
7 T) ]8 Y( N5 j: C% [% Overy young age. The physical findings in these boys
, v. @" ~% z( V0 c% u9 S! B( iwith this disorder are full pubertal development,
( `% F7 L* c0 j: \" E* D( Eincluding bilateral testicular growth, similar to boys5 o# L( `4 j2 K- }" S& h
with CPP. The gonadotropin levels in this disorder! y# i! ^/ d! b- V s& ? }2 |
are suppressed to prepubertal levels and do not show
1 h' Y/ _$ r2 m+ Ipubertal response of gonadotropin after gonadotropin-
2 l* R" {/ l2 K8 L- i. T& ~releasing hormone stimulation. This is a sex-linked
c' F% r3 b& F, s) ^8 Oautosomal dominant disorder that affects only
3 W" h6 x/ s7 J8 A* L7 b1 \$ pmales; therefore, other male members of the family
0 \$ B- j0 {/ H) g# u7 Jmay have similar precocious puberty.32 b! `) ]1 h7 n" Z0 n
In our patient, physical examination was incon-
3 K3 \" ^, A2 x- asistent with true precocious puberty since his testi-
! U, Z v9 d3 Y Z# [8 R2 Wcles were prepubertal in size. However, testotoxicosis. S1 H6 T- C3 a% a+ F& b* f- A
was in the differential diagnosis because his father
h$ l& f% P# ]. F; f6 [9 Ustarted puberty somewhat early, and occasionally,
( w& B9 v# Q3 Z( j6 N' _testicular enlargement is not that evident in the3 F7 J3 f# A: I
beginning of this process.1 In the absence of a neg-
* p8 F6 x" f- K2 sative initial history of androgen exposure, our$ B6 N8 ^# g& p
biggest concern was virilizing adrenal hyperplasia,
! u H; k# k2 K2 D5 {either 21-hydroxylase deficiency or 11-β hydroxylase, P4 N6 D$ u, u( Z& h* G
deficiency. Those diagnoses were excluded by find-
P% M' w/ L, I5 Z( `% S' ^7 p0 `+ xing the normal level of adrenal steroids.+ C: O; Y6 O! B6 }
The diagnosis of exogenous androgens was strongly3 L# E; v7 a- E& ^. Y- M
suspected in a follow-up visit after 4 months because; J6 W8 T7 f/ ?7 O
the physical examination revealed the complete disap-* h* o( v u/ J5 r) \. v
pearance of pubic hair, normal growth velocity, and
9 v/ x' b3 v+ H+ sdecreased erections. The father admitted using a testos-
/ d5 e- {" d" k3 m1 F1 l: x7 jterone gel, which he concealed at first visit. He was
5 L1 W5 P2 g( h( c3 M/ Z4 f7 Kusing it rather frequently, twice a day. The Physicians’
0 n. j$ P* G5 U9 R/ k0 \Desk Reference, or package insert of this product, gel or
% u/ _% E0 p+ ^3 U `9 o4 U: ccream, cautions about dermal testosterone transfer to
) j( ^+ T. G$ funprotected females through direct skin exposure.3 Y C* J) s1 m
Serum testosterone level was found to be 2 times the, Z; j9 ]# ^, V
baseline value in those females who were exposed to8 y6 p( f# f' k5 v# v+ b
even 15 minutes of direct skin contact with their male) M" }. ~& x+ n0 J' @
partners.6 However, when a shirt covered the applica-
; h0 {' z) ^$ A1 p2 [tion site, this testosterone transfer was prevented.0 ], q4 m3 r2 L" v% W
Our patient’s testosterone level was 60 ng/mL,6 v7 E9 I1 }9 z
which was clearly high. Some studies suggest that& `- [1 \# J: _3 z2 r7 Y
dermal conversion of testosterone to dihydrotestos-
3 _& T0 w+ X# E: O5 h! Nterone, which is a more potent metabolite, is more1 \9 T1 i! _4 Q. `0 {
active in young children exposed to testosterone% Y& R# e. T+ L8 O$ g& r v
exogenously7; however, we did not measure a dihy-1 i$ x# s) a1 V& c# V$ J4 Z
drotestosterone level in our patient. In addition to0 {$ f& H- ^$ r0 L- G
virilization, exposure to exogenous testosterone in
' K0 T1 U0 X; k5 x; R, w" Z2 Jchildren results in an increase in growth velocity and
$ A; d, }* K9 Z! C7 V" U" j( m0 }advanced bone age, as seen in our patient.8 J# c1 l& B5 Z3 V4 g
The long-term effect of androgen exposure during, O3 N# W/ G) L4 h' d2 X
early childhood on pubertal development and final0 B! Y4 \! Z! K4 v/ w
adult height are not fully known and always remain c$ x& s; c) P1 c/ ~! C: v( t2 K
a concern. Children treated with short-term testos-
4 d6 i# Y6 V) j& Q: uterone injection or topical androgen may exhibit some
/ h. f' n9 a9 `/ Y' Q- {acceleration of the skeletal maturation; however, after
. v) h. I K9 d# P9 Tcessation of treatment, the rate of bone maturation
9 B+ {4 k' L5 C: b) V4 k$ ]. _8 ?decelerates and gradually returns to normal.8,9
3 f/ {& k( m% LThere are conflicting reports and controversy' o4 z. d1 y5 q4 X {/ N$ p: V; V
over the effect of early androgen exposure on adult+ B% `2 E8 [ X i9 k
penile length.10,11 Some reports suggest subnormal
/ T. P0 R- P- P* }. F- wadult penile length, apparently because of downreg-' a% J2 G* r% u1 P+ z* M1 j
ulation of androgen receptor number.10,12 However,3 l# z: ~3 ~( ^8 r `. [
Sutherland et al13 did not find a correlation between
2 G) x7 R8 K- V" Achildhood testosterone exposure and reduced adult
7 g! }/ W( l9 Npenile length in clinical studies.4 A5 b% p# d' _( N( P
Nonetheless, we do not believe our patient is
$ d: e* O; Z) g! z, r- F$ j1 {going to experience any of the untoward effects from
6 u1 u- C: |; c4 |/ t, d- ~( o. [testosterone exposure as mentioned earlier because
8 [( ^2 [5 V mthe exposure was not for a prolonged period of time.4 I, G$ e4 i/ g9 J+ Z
Although the bone age was advanced at the time of0 }1 E( Q& k& o: N
diagnosis, the child had a normal growth velocity at: z3 X" v7 i: K% B: _/ }
the follow-up visit. It is hoped that his final adult$ ` r! f# k8 G- s
height will not be affected.+ s+ _6 E |* V( ~9 S/ Q
Although rarely reported, the widespread avail-. T; h7 V9 V, B+ _5 B) _4 E. l
ability of androgen products in our society may% c* _+ l, Z7 z5 [3 q
indeed cause more virilization in male or female
* i+ n" Z" S7 j& r& tchildren than one would realize. Exposure to andro-0 y6 ^3 q. m- G/ ~) f+ t
gen products must be considered and specific ques-) f& |# U. N0 Z+ v* W$ s( ~& i
tioning about the use of a testosterone product or$ x' W, q" x" g1 ^( [* ]
gel should be asked of the family members during
. r: m* p9 n" X- nthe evaluation of any children who present with vir-
8 A K: @8 I, w. }: Zilization or peripheral precocious puberty. The diag-1 }6 y# e8 c; U! Y
nosis can be established by just a few tests and by
: W% Z9 W8 p- t8 `2 D# L2 Zappropriate history. The inability to obtain such a
1 z) ?" o" q' _( a; A6 r! Dhistory, or failure to ask the specific questions, may
4 d7 g7 u0 S2 X1 h0 Vresult in extensive, unnecessary, and expensive* @/ D+ s) p5 N1 _% [, _ ?3 R( o
investigation. The primary care physician should be7 u2 z( ~5 k; H C0 q5 @
aware of this fact, because most of these children+ L' x9 F. T* L$ T( r# a
may initially present in their practice. The Physicians’
4 W! H* M/ P8 i* H2 o/ }Desk Reference and package insert should also put a0 |, ]1 {7 p" ^* I0 p2 v) T! P
warning about the virilizing effect on a male or
* d. C' g2 Q7 N2 K* ufemale child who might come in contact with some-- ^6 C" F' T* S0 V
one using any of these products., j3 U: m$ W o: L1 n
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